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mm/memory-failure.c
44.3 KB
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/* * Copyright (C) 2008, 2009 Intel Corporation * Authors: Andi Kleen, Fengguang Wu * * This software may be redistributed and/or modified under the terms of * the GNU General Public License ("GPL") version 2 only as published by the * Free Software Foundation. * * High level machine check handler. Handles pages reported by the |
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* hardware as being corrupted usually due to a multi-bit ECC memory or cache |
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* failure. |
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* * In addition there is a "soft offline" entry point that allows stop using * not-yet-corrupted-by-suspicious pages without killing anything. |
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* * Handles page cache pages in various states. The tricky part |
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* here is that we can access any page asynchronously in respect to * other VM users, because memory failures could happen anytime and * anywhere. This could violate some of their assumptions. This is why * this code has to be extremely careful. Generally it tries to use * normal locking rules, as in get the standard locks, even if that means * the error handling takes potentially a long time. * * There are several operations here with exponential complexity because * of unsuitable VM data structures. For example the operation to map back * from RMAP chains to processes has to walk the complete process list and * has non linear complexity with the number. But since memory corruptions * are rare we hope to get away with this. This avoids impacting the core * VM. |
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*/ /* * Notebook: * - hugetlb needs more code * - kcore/oldmem/vmcore/mem/kmem check for hwpoison pages * - pass bad pages to kdump next kernel */ |
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#include <linux/kernel.h> #include <linux/mm.h> #include <linux/page-flags.h> |
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#include <linux/kernel-page-flags.h> |
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#include <linux/sched.h> |
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#include <linux/ksm.h> |
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#include <linux/rmap.h> |
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#include <linux/export.h> |
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#include <linux/pagemap.h> #include <linux/swap.h> #include <linux/backing-dev.h> |
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#include <linux/migrate.h> #include <linux/page-isolation.h> #include <linux/suspend.h> |
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#include <linux/slab.h> |
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#include <linux/swapops.h> |
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#include <linux/hugetlb.h> |
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#include <linux/memory_hotplug.h> |
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#include <linux/mm_inline.h> |
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#include <linux/kfifo.h> |
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#include "internal.h" int sysctl_memory_failure_early_kill __read_mostly = 0; int sysctl_memory_failure_recovery __read_mostly = 1; |
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atomic_long_t num_poisoned_pages __read_mostly = ATOMIC_LONG_INIT(0); |
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|
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#if defined(CONFIG_HWPOISON_INJECT) || defined(CONFIG_HWPOISON_INJECT_MODULE) |
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u32 hwpoison_filter_enable = 0; |
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u32 hwpoison_filter_dev_major = ~0U; u32 hwpoison_filter_dev_minor = ~0U; |
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u64 hwpoison_filter_flags_mask; u64 hwpoison_filter_flags_value; |
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EXPORT_SYMBOL_GPL(hwpoison_filter_enable); |
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EXPORT_SYMBOL_GPL(hwpoison_filter_dev_major); EXPORT_SYMBOL_GPL(hwpoison_filter_dev_minor); |
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EXPORT_SYMBOL_GPL(hwpoison_filter_flags_mask); EXPORT_SYMBOL_GPL(hwpoison_filter_flags_value); |
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static int hwpoison_filter_dev(struct page *p) { struct address_space *mapping; dev_t dev; if (hwpoison_filter_dev_major == ~0U && hwpoison_filter_dev_minor == ~0U) return 0; /* |
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* page_mapping() does not accept slab pages. |
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*/ if (PageSlab(p)) return -EINVAL; mapping = page_mapping(p); if (mapping == NULL || mapping->host == NULL) return -EINVAL; dev = mapping->host->i_sb->s_dev; if (hwpoison_filter_dev_major != ~0U && hwpoison_filter_dev_major != MAJOR(dev)) return -EINVAL; if (hwpoison_filter_dev_minor != ~0U && hwpoison_filter_dev_minor != MINOR(dev)) return -EINVAL; return 0; } |
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static int hwpoison_filter_flags(struct page *p) { if (!hwpoison_filter_flags_mask) return 0; if ((stable_page_flags(p) & hwpoison_filter_flags_mask) == hwpoison_filter_flags_value) return 0; else return -EINVAL; } |
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/* * This allows stress tests to limit test scope to a collection of tasks * by putting them under some memcg. This prevents killing unrelated/important * processes such as /sbin/init. Note that the target task may share clean * pages with init (eg. libc text), which is harmless. If the target task * share _dirty_ pages with another task B, the test scheme must make sure B * is also included in the memcg. At last, due to race conditions this filter * can only guarantee that the page either belongs to the memcg tasks, or is * a freed page. */ |
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#ifdef CONFIG_MEMCG_SWAP |
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u64 hwpoison_filter_memcg; EXPORT_SYMBOL_GPL(hwpoison_filter_memcg); static int hwpoison_filter_task(struct page *p) { struct mem_cgroup *mem; struct cgroup_subsys_state *css; unsigned long ino; if (!hwpoison_filter_memcg) return 0; mem = try_get_mem_cgroup_from_page(p); if (!mem) return -EINVAL; css = mem_cgroup_css(mem); /* root_mem_cgroup has NULL dentries */ if (!css->cgroup->dentry) return -EINVAL; ino = css->cgroup->dentry->d_inode->i_ino; css_put(css); if (ino != hwpoison_filter_memcg) return -EINVAL; return 0; } #else static int hwpoison_filter_task(struct page *p) { return 0; } #endif |
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int hwpoison_filter(struct page *p) { |
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if (!hwpoison_filter_enable) return 0; |
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if (hwpoison_filter_dev(p)) return -EINVAL; |
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if (hwpoison_filter_flags(p)) return -EINVAL; |
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if (hwpoison_filter_task(p)) return -EINVAL; |
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return 0; } |
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#else int hwpoison_filter(struct page *p) { return 0; } #endif |
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EXPORT_SYMBOL_GPL(hwpoison_filter); |
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/* |
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* Send all the processes who have the page mapped a signal. * ``action optional'' if they are not immediately affected by the error * ``action required'' if error happened in current execution context |
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*/ |
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static int kill_proc(struct task_struct *t, unsigned long addr, int trapno, unsigned long pfn, struct page *page, int flags) |
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{ struct siginfo si; int ret; printk(KERN_ERR |
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"MCE %#lx: Killing %s:%d due to hardware memory corruption ", |
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pfn, t->comm, t->pid); si.si_signo = SIGBUS; si.si_errno = 0; |
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si.si_addr = (void *)addr; #ifdef __ARCH_SI_TRAPNO si.si_trapno = trapno; #endif |
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si.si_addr_lsb = compound_trans_order(compound_head(page)) + PAGE_SHIFT; |
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if ((flags & MF_ACTION_REQUIRED) && t == current) { si.si_code = BUS_MCEERR_AR; ret = force_sig_info(SIGBUS, &si, t); } else { /* * Don't use force here, it's convenient if the signal * can be temporarily blocked. * This could cause a loop when the user sets SIGBUS * to SIG_IGN, but hopefully no one will do that? */ si.si_code = BUS_MCEERR_AO; ret = send_sig_info(SIGBUS, &si, t); /* synchronous? */ } |
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if (ret < 0) printk(KERN_INFO "MCE: Error sending signal to %s:%d: %d ", t->comm, t->pid, ret); return ret; } /* |
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* When a unknown page type is encountered drain as many buffers as possible * in the hope to turn the page into a LRU or free page, which we can handle. */ |
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void shake_page(struct page *p, int access) |
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{ if (!PageSlab(p)) { lru_add_drain_all(); if (PageLRU(p)) return; drain_all_pages(); if (PageLRU(p) || is_free_buddy_page(p)) return; } |
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|
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/* |
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* Only call shrink_slab here (which would also shrink other caches) if * access is not potentially fatal. |
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*/ |
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if (access) { int nr; do { |
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struct shrink_control shrink = { .gfp_mask = GFP_KERNEL, |
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}; |
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nr = shrink_slab(&shrink, 1000, 1000); |
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if (page_count(p) == 1) |
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break; } while (nr > 10); } |
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} EXPORT_SYMBOL_GPL(shake_page); /* |
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* Kill all processes that have a poisoned page mapped and then isolate * the page. * * General strategy: * Find all processes having the page mapped and kill them. * But we keep a page reference around so that the page is not * actually freed yet. * Then stash the page away * * There's no convenient way to get back to mapped processes * from the VMAs. So do a brute-force search over all * running processes. * * Remember that machine checks are not common (or rather * if they are common you have other problems), so this shouldn't * be a performance issue. * * Also there are some races possible while we get from the * error detection to actually handle it. */ struct to_kill { struct list_head nd; struct task_struct *tsk; unsigned long addr; |
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char addr_valid; |
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}; /* * Failure handling: if we can't find or can't kill a process there's * not much we can do. We just print a message and ignore otherwise. */ /* * Schedule a process for later kill. * Uses GFP_ATOMIC allocations to avoid potential recursions in the VM. * TBD would GFP_NOIO be enough? */ static void add_to_kill(struct task_struct *tsk, struct page *p, struct vm_area_struct *vma, struct list_head *to_kill, struct to_kill **tkc) { struct to_kill *tk; if (*tkc) { tk = *tkc; *tkc = NULL; } else { tk = kmalloc(sizeof(struct to_kill), GFP_ATOMIC); if (!tk) { printk(KERN_ERR "MCE: Out of memory while machine check handling "); return; } } tk->addr = page_address_in_vma(p, vma); tk->addr_valid = 1; /* * In theory we don't have to kill when the page was * munmaped. But it could be also a mremap. Since that's * likely very rare kill anyways just out of paranoia, but use * a SIGKILL because the error is not contained anymore. */ if (tk->addr == -EFAULT) { |
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pr_info("MCE: Unable to find user space address %lx in %s ", |
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page_to_pfn(p), tsk->comm); tk->addr_valid = 0; } get_task_struct(tsk); tk->tsk = tsk; list_add_tail(&tk->nd, to_kill); } /* * Kill the processes that have been collected earlier. * * Only do anything when DOIT is set, otherwise just free the list * (this is used for clean pages which do not need killing) * Also when FAIL is set do a force kill because something went * wrong earlier. */ |
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static void kill_procs(struct list_head *to_kill, int forcekill, int trapno, |
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int fail, struct page *page, unsigned long pfn, int flags) |
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{ struct to_kill *tk, *next; list_for_each_entry_safe (tk, next, to_kill, nd) { |
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if (forcekill) { |
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/* |
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* In case something went wrong with munmapping |
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* make sure the process doesn't catch the * signal and then access the memory. Just kill it. |
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*/ if (fail || tk->addr_valid == 0) { printk(KERN_ERR "MCE %#lx: forcibly killing %s:%d because of failure to unmap corrupted page ", pfn, tk->tsk->comm, tk->tsk->pid); force_sig(SIGKILL, tk->tsk); } /* * In theory the process could have mapped * something else on the address in-between. We could * check for that, but we need to tell the * process anyways. */ |
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else if (kill_proc(tk->tsk, tk->addr, trapno, pfn, page, flags) < 0) |
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printk(KERN_ERR "MCE %#lx: Cannot send advisory machine check signal to %s:%d ", pfn, tk->tsk->comm, tk->tsk->pid); } put_task_struct(tk->tsk); kfree(tk); } } static int task_early_kill(struct task_struct *tsk) { if (!tsk->mm) return 0; if (tsk->flags & PF_MCE_PROCESS) return !!(tsk->flags & PF_MCE_EARLY); return sysctl_memory_failure_early_kill; } /* * Collect processes when the error hit an anonymous page. */ static void collect_procs_anon(struct page *page, struct list_head *to_kill, struct to_kill **tkc) { struct vm_area_struct *vma; struct task_struct *tsk; struct anon_vma *av; |
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pgoff_t pgoff; |
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|
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av = page_lock_anon_vma_read(page); |
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if (av == NULL) /* Not actually mapped anymore */ |
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return; |
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pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT); |
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read_lock(&tasklist_lock); |
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for_each_process (tsk) { |
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struct anon_vma_chain *vmac; |
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if (!task_early_kill(tsk)) continue; |
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anon_vma_interval_tree_foreach(vmac, &av->rb_root, pgoff, pgoff) { |
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vma = vmac->vma; |
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if (!page_mapped_in_vma(page, vma)) continue; if (vma->vm_mm == tsk->mm) add_to_kill(tsk, page, vma, to_kill, tkc); } } |
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read_unlock(&tasklist_lock); |
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page_unlock_anon_vma_read(av); |
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} /* * Collect processes when the error hit a file mapped page. */ static void collect_procs_file(struct page *page, struct list_head *to_kill, struct to_kill **tkc) { struct vm_area_struct *vma; struct task_struct *tsk; |
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struct address_space *mapping = page->mapping; |
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mutex_lock(&mapping->i_mmap_mutex); |
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read_lock(&tasklist_lock); |
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for_each_process(tsk) { pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT); if (!task_early_kill(tsk)) continue; |
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vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, |
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pgoff) { /* * Send early kill signal to tasks where a vma covers * the page but the corrupted page is not necessarily * mapped it in its pte. * Assume applications who requested early kill want * to be informed of all such data corruptions. */ if (vma->vm_mm == tsk->mm) add_to_kill(tsk, page, vma, to_kill, tkc); } } |
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read_unlock(&tasklist_lock); |
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mutex_unlock(&mapping->i_mmap_mutex); |
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} /* * Collect the processes who have the corrupted page mapped to kill. * This is done in two steps for locking reasons. * First preallocate one tokill structure outside the spin locks, * so that we can kill at least one process reasonably reliable. */ static void collect_procs(struct page *page, struct list_head *tokill) { struct to_kill *tk; if (!page->mapping) return; tk = kmalloc(sizeof(struct to_kill), GFP_NOIO); if (!tk) return; if (PageAnon(page)) collect_procs_anon(page, tokill, &tk); else collect_procs_file(page, tokill, &tk); kfree(tk); } /* * Error handlers for various types of pages. */ enum outcome { |
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IGNORED, /* Error: cannot be handled */ FAILED, /* Error: handling failed */ |
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DELAYED, /* Will be handled later */ |
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RECOVERED, /* Successfully recovered */ }; static const char *action_name[] = { |
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[IGNORED] = "Ignored", |
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[FAILED] = "Failed", [DELAYED] = "Delayed", |
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[RECOVERED] = "Recovered", }; /* |
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* XXX: It is possible that a page is isolated from LRU cache, * and then kept in swap cache or failed to remove from page cache. * The page count will stop it from being freed by unpoison. * Stress tests should be aware of this memory leak problem. */ static int delete_from_lru_cache(struct page *p) { if (!isolate_lru_page(p)) { /* * Clear sensible page flags, so that the buddy system won't * complain when the page is unpoison-and-freed. */ ClearPageActive(p); ClearPageUnevictable(p); /* * drop the page count elevated by isolate_lru_page() */ page_cache_release(p); return 0; } return -EIO; } /* |
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* Error hit kernel page. * Do nothing, try to be lucky and not touch this instead. For a few cases we * could be more sophisticated. */ static int me_kernel(struct page *p, unsigned long pfn) { |
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return IGNORED; } /* * Page in unknown state. Do nothing. */ static int me_unknown(struct page *p, unsigned long pfn) { printk(KERN_ERR "MCE %#lx: Unknown page state ", pfn); return FAILED; } /* |
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* Clean (or cleaned) page cache page. */ static int me_pagecache_clean(struct page *p, unsigned long pfn) { int err; int ret = FAILED; struct address_space *mapping; |
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delete_from_lru_cache(p); |
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/* * For anonymous pages we're done the only reference left * should be the one m_f() holds. */ if (PageAnon(p)) return RECOVERED; /* * Now truncate the page in the page cache. This is really * more like a "temporary hole punch" * Don't do this for block devices when someone else * has a reference, because it could be file system metadata * and that's not safe to truncate. */ mapping = page_mapping(p); if (!mapping) { /* * Page has been teared down in the meanwhile */ return FAILED; } /* * Truncation is a bit tricky. Enable it per file system for now. * * Open: to take i_mutex or not for this? Right now we don't. */ if (mapping->a_ops->error_remove_page) { err = mapping->a_ops->error_remove_page(mapping, p); if (err != 0) { printk(KERN_INFO "MCE %#lx: Failed to punch page: %d ", pfn, err); } else if (page_has_private(p) && !try_to_release_page(p, GFP_NOIO)) { |
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pr_info("MCE %#lx: failed to release buffers ", pfn); |
6a46079cf HWPOISON: The hig... |
585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 |
} else { ret = RECOVERED; } } else { /* * If the file system doesn't support it just invalidate * This fails on dirty or anything with private pages */ if (invalidate_inode_page(p)) ret = RECOVERED; else printk(KERN_INFO "MCE %#lx: Failed to invalidate ", pfn); } return ret; } /* * Dirty cache page page * Issues: when the error hit a hole page the error is not properly * propagated. */ static int me_pagecache_dirty(struct page *p, unsigned long pfn) { struct address_space *mapping = page_mapping(p); SetPageError(p); /* TBD: print more information about the file. */ if (mapping) { /* * IO error will be reported by write(), fsync(), etc. * who check the mapping. * This way the application knows that something went * wrong with its dirty file data. * * There's one open issue: * * The EIO will be only reported on the next IO * operation and then cleared through the IO map. * Normally Linux has two mechanisms to pass IO error * first through the AS_EIO flag in the address space * and then through the PageError flag in the page. * Since we drop pages on memory failure handling the * only mechanism open to use is through AS_AIO. * * This has the disadvantage that it gets cleared on * the first operation that returns an error, while * the PageError bit is more sticky and only cleared * when the page is reread or dropped. If an * application assumes it will always get error on * fsync, but does other operations on the fd before |
25985edce Fix common misspe... |
637 |
* and the page is dropped between then the error |
6a46079cf HWPOISON: The hig... |
638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 |
* will not be properly reported. * * This can already happen even without hwpoisoned * pages: first on metadata IO errors (which only * report through AS_EIO) or when the page is dropped * at the wrong time. * * So right now we assume that the application DTRT on * the first EIO, but we're not worse than other parts * of the kernel. */ mapping_set_error(mapping, EIO); } return me_pagecache_clean(p, pfn); } /* * Clean and dirty swap cache. * * Dirty swap cache page is tricky to handle. The page could live both in page * cache and swap cache(ie. page is freshly swapped in). So it could be * referenced concurrently by 2 types of PTEs: * normal PTEs and swap PTEs. We try to handle them consistently by calling * try_to_unmap(TTU_IGNORE_HWPOISON) to convert the normal PTEs to swap PTEs, * and then * - clear dirty bit to prevent IO * - remove from LRU * - but keep in the swap cache, so that when we return to it on * a later page fault, we know the application is accessing * corrupted data and shall be killed (we installed simple * interception code in do_swap_page to catch it). * * Clean swap cache pages can be directly isolated. A later page fault will * bring in the known good data from disk. */ static int me_swapcache_dirty(struct page *p, unsigned long pfn) { |
6a46079cf HWPOISON: The hig... |
676 677 678 |
ClearPageDirty(p); /* Trigger EIO in shmem: */ ClearPageUptodate(p); |
dc2a1cbf7 HWPOISON: introdu... |
679 680 681 682 |
if (!delete_from_lru_cache(p)) return DELAYED; else return FAILED; |
6a46079cf HWPOISON: The hig... |
683 684 685 686 |
} static int me_swapcache_clean(struct page *p, unsigned long pfn) { |
6a46079cf HWPOISON: The hig... |
687 |
delete_from_swap_cache(p); |
e43c3afb3 HWPOISON: return ... |
688 |
|
dc2a1cbf7 HWPOISON: introdu... |
689 690 691 692 |
if (!delete_from_lru_cache(p)) return RECOVERED; else return FAILED; |
6a46079cf HWPOISON: The hig... |
693 694 695 696 697 |
} /* * Huge pages. Needs work. * Issues: |
93f70f900 HWPOISON, hugetlb... |
698 699 |
* - Error on hugepage is contained in hugepage unit (not in raw page unit.) * To narrow down kill region to one page, we need to break up pmd. |
6a46079cf HWPOISON: The hig... |
700 701 702 |
*/ static int me_huge_page(struct page *p, unsigned long pfn) { |
6de2b1aab HWPOISON, hugetlb... |
703 |
int res = 0; |
93f70f900 HWPOISON, hugetlb... |
704 705 706 707 708 709 710 711 712 713 714 715 |
struct page *hpage = compound_head(p); /* * We can safely recover from error on free or reserved (i.e. * not in-use) hugepage by dequeuing it from freelist. * To check whether a hugepage is in-use or not, we can't use * page->lru because it can be used in other hugepage operations, * such as __unmap_hugepage_range() and gather_surplus_pages(). * So instead we use page_mapping() and PageAnon(). * We assume that this function is called with page lock held, * so there is no race between isolation and mapping/unmapping. */ if (!(page_mapping(hpage) || PageAnon(hpage))) { |
6de2b1aab HWPOISON, hugetlb... |
716 717 718 |
res = dequeue_hwpoisoned_huge_page(hpage); if (!res) return RECOVERED; |
93f70f900 HWPOISON, hugetlb... |
719 720 |
} return DELAYED; |
6a46079cf HWPOISON: The hig... |
721 722 723 724 725 726 727 728 729 |
} /* * Various page states we can handle. * * A page state is defined by its current page->flags bits. * The table matches them in order and calls the right handler. * * This is quite tricky because we can access page at any time |
25985edce Fix common misspe... |
730 |
* in its live cycle, so all accesses have to be extremely careful. |
6a46079cf HWPOISON: The hig... |
731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 |
* * This is not complete. More states could be added. * For any missing state don't attempt recovery. */ #define dirty (1UL << PG_dirty) #define sc (1UL << PG_swapcache) #define unevict (1UL << PG_unevictable) #define mlock (1UL << PG_mlocked) #define writeback (1UL << PG_writeback) #define lru (1UL << PG_lru) #define swapbacked (1UL << PG_swapbacked) #define head (1UL << PG_head) #define tail (1UL << PG_tail) #define compound (1UL << PG_compound) #define slab (1UL << PG_slab) |
6a46079cf HWPOISON: The hig... |
747 748 749 750 751 752 753 754 |
#define reserved (1UL << PG_reserved) static struct page_state { unsigned long mask; unsigned long res; char *msg; int (*action)(struct page *p, unsigned long pfn); } error_states[] = { |
d95ea51e3 HWPOISON: make se... |
755 |
{ reserved, reserved, "reserved kernel", me_kernel }, |
95d01fc66 HWPOISON: remove ... |
756 757 758 759 |
/* * free pages are specially detected outside this table: * PG_buddy pages only make a small fraction of all free pages. */ |
6a46079cf HWPOISON: The hig... |
760 761 762 763 764 765 766 767 768 769 770 771 772 773 |
/* * Could in theory check if slab page is free or if we can drop * currently unused objects without touching them. But just * treat it as standard kernel for now. */ { slab, slab, "kernel slab", me_kernel }, #ifdef CONFIG_PAGEFLAGS_EXTENDED { head, head, "huge", me_huge_page }, { tail, tail, "huge", me_huge_page }, #else { compound, compound, "huge", me_huge_page }, #endif |
ff604cf6d mm: hwpoison: fix... |
774 775 |
{ sc|dirty, sc|dirty, "dirty swapcache", me_swapcache_dirty }, { sc|dirty, sc, "clean swapcache", me_swapcache_clean }, |
6a46079cf HWPOISON: The hig... |
776 |
|
ff604cf6d mm: hwpoison: fix... |
777 |
{ mlock|dirty, mlock|dirty, "dirty mlocked LRU", me_pagecache_dirty }, |
e39862958 HWPOISON: check d... |
778 |
{ mlock|dirty, mlock, "clean mlocked LRU", me_pagecache_clean }, |
6a46079cf HWPOISON: The hig... |
779 |
|
5f4b9fc5c HWPOISON: change ... |
780 |
{ unevict|dirty, unevict|dirty, "dirty unevictable LRU", me_pagecache_dirty }, |
e39862958 HWPOISON: check d... |
781 |
{ unevict|dirty, unevict, "clean unevictable LRU", me_pagecache_clean }, |
5f4b9fc5c HWPOISON: change ... |
782 |
|
ff604cf6d mm: hwpoison: fix... |
783 |
{ lru|dirty, lru|dirty, "dirty LRU", me_pagecache_dirty }, |
6a46079cf HWPOISON: The hig... |
784 |
{ lru|dirty, lru, "clean LRU", me_pagecache_clean }, |
6a46079cf HWPOISON: The hig... |
785 786 787 788 789 790 |
/* * Catchall entry: must be at end. */ { 0, 0, "unknown page state", me_unknown }, }; |
2326c467d HWPOISON: Undefin... |
791 792 793 794 795 796 797 798 799 800 801 802 |
#undef dirty #undef sc #undef unevict #undef mlock #undef writeback #undef lru #undef swapbacked #undef head #undef tail #undef compound #undef slab #undef reserved |
ff604cf6d mm: hwpoison: fix... |
803 804 805 806 |
/* * "Dirty/Clean" indication is not 100% accurate due to the possibility of * setting PG_dirty outside page lock. See also comment above set_page_dirty(). */ |
6a46079cf HWPOISON: The hig... |
807 808 |
static void action_result(unsigned long pfn, char *msg, int result) { |
ff604cf6d mm: hwpoison: fix... |
809 810 811 |
pr_err("MCE %#lx: %s page recovery: %s ", pfn, msg, action_name[result]); |
6a46079cf HWPOISON: The hig... |
812 813 814 |
} static int page_action(struct page_state *ps, struct page *p, |
bd1ce5f91 HWPOISON: avoid g... |
815 |
unsigned long pfn) |
6a46079cf HWPOISON: The hig... |
816 817 |
{ int result; |
7456b0405 HWPOISON: fix inv... |
818 |
int count; |
6a46079cf HWPOISON: The hig... |
819 820 821 |
result = ps->action(p, pfn); action_result(pfn, ps->msg, result); |
7456b0405 HWPOISON: fix inv... |
822 |
|
bd1ce5f91 HWPOISON: avoid g... |
823 |
count = page_count(p) - 1; |
138ce286e HWPOISON: return ... |
824 825 826 |
if (ps->action == me_swapcache_dirty && result == DELAYED) count--; if (count != 0) { |
6a46079cf HWPOISON: The hig... |
827 828 829 |
printk(KERN_ERR "MCE %#lx: %s page still referenced by %d users ", |
7456b0405 HWPOISON: fix inv... |
830 |
pfn, ps->msg, count); |
138ce286e HWPOISON: return ... |
831 832 |
result = FAILED; } |
6a46079cf HWPOISON: The hig... |
833 834 835 836 837 |
/* Could do more checks here if page looks ok */ /* * Could adjust zone counters here to correct for the missing page. */ |
138ce286e HWPOISON: return ... |
838 |
return (result == RECOVERED || result == DELAYED) ? 0 : -EBUSY; |
6a46079cf HWPOISON: The hig... |
839 |
} |
6a46079cf HWPOISON: The hig... |
840 841 842 843 |
/* * Do all that is necessary to remove user space mappings. Unmap * the pages and send SIGBUS to the processes if the data was dirty. */ |
1668bfd5b HWPOISON: abort o... |
844 |
static int hwpoison_user_mappings(struct page *p, unsigned long pfn, |
7329bbeb9 HWPOISON: Add cod... |
845 |
int trapno, int flags) |
6a46079cf HWPOISON: The hig... |
846 847 848 849 850 |
{ enum ttu_flags ttu = TTU_UNMAP | TTU_IGNORE_MLOCK | TTU_IGNORE_ACCESS; struct address_space *mapping; LIST_HEAD(tokill); int ret; |
6751ed65d x86/mce: Fix sigi... |
851 |
int kill = 1, forcekill; |
7af446a84 HWPOISON, hugetlb... |
852 |
struct page *hpage = compound_head(p); |
a6d30ddda thp: fix the wron... |
853 |
struct page *ppage; |
6a46079cf HWPOISON: The hig... |
854 |
|
1668bfd5b HWPOISON: abort o... |
855 856 |
if (PageReserved(p) || PageSlab(p)) return SWAP_SUCCESS; |
6a46079cf HWPOISON: The hig... |
857 |
|
6a46079cf HWPOISON: The hig... |
858 859 860 861 |
/* * This check implies we don't kill processes if their pages * are in the swap cache early. Those are always late kills. */ |
7af446a84 HWPOISON, hugetlb... |
862 |
if (!page_mapped(hpage)) |
1668bfd5b HWPOISON: abort o... |
863 |
return SWAP_SUCCESS; |
7af446a84 HWPOISON, hugetlb... |
864 |
if (PageKsm(p)) |
1668bfd5b HWPOISON: abort o... |
865 |
return SWAP_FAIL; |
6a46079cf HWPOISON: The hig... |
866 867 868 869 870 871 872 873 874 875 876 |
if (PageSwapCache(p)) { printk(KERN_ERR "MCE %#lx: keeping poisoned page in swap cache ", pfn); ttu |= TTU_IGNORE_HWPOISON; } /* * Propagate the dirty bit from PTEs to struct page first, because we * need this to decide if we should kill or just drop the page. |
db0480b3a HWPOISON: comment... |
877 878 |
* XXX: the dirty test could be racy: set_page_dirty() may not always * be called inside page lock (it's recommended but not enforced). |
6a46079cf HWPOISON: The hig... |
879 |
*/ |
7af446a84 HWPOISON, hugetlb... |
880 |
mapping = page_mapping(hpage); |
6751ed65d x86/mce: Fix sigi... |
881 |
if (!(flags & MF_MUST_KILL) && !PageDirty(hpage) && mapping && |
7af446a84 HWPOISON, hugetlb... |
882 883 884 |
mapping_cap_writeback_dirty(mapping)) { if (page_mkclean(hpage)) { SetPageDirty(hpage); |
6a46079cf HWPOISON: The hig... |
885 886 887 888 889 890 891 892 893 |
} else { kill = 0; ttu |= TTU_IGNORE_HWPOISON; printk(KERN_INFO "MCE %#lx: corrupted page was clean: dropped without side effects ", pfn); } } |
a6d30ddda thp: fix the wron... |
894 895 896 897 898 899 900 |
/* * ppage: poisoned page * if p is regular page(4k page) * ppage == real poisoned page; * else p is hugetlb or THP, ppage == head page. */ ppage = hpage; |
efeda7a41 thp: fix splittin... |
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 |
if (PageTransHuge(hpage)) { /* * Verify that this isn't a hugetlbfs head page, the check for * PageAnon is just for avoid tripping a split_huge_page * internal debug check, as split_huge_page refuses to deal with * anything that isn't an anon page. PageAnon can't go away fro * under us because we hold a refcount on the hpage, without a * refcount on the hpage. split_huge_page can't be safely called * in the first place, having a refcount on the tail isn't * enough * to be safe. */ if (!PageHuge(hpage) && PageAnon(hpage)) { if (unlikely(split_huge_page(hpage))) { /* * FIXME: if splitting THP is failed, it is * better to stop the following operation rather * than causing panic by unmapping. System might * survive if the page is freed later. */ printk(KERN_INFO "MCE %#lx: failed to split THP ", pfn); BUG_ON(!PageHWPoison(p)); return SWAP_FAIL; } |
a6d30ddda thp: fix the wron... |
927 928 |
/* THP is split, so ppage should be the real poisoned page. */ ppage = p; |
efeda7a41 thp: fix splittin... |
929 930 |
} } |
6a46079cf HWPOISON: The hig... |
931 932 933 934 935 936 937 938 939 |
/* * First collect all the processes that have the page * mapped in dirty form. This has to be done before try_to_unmap, * because ttu takes the rmap data structures down. * * Error handling: We ignore errors here because * there's nothing that can be done. */ if (kill) |
a6d30ddda thp: fix the wron... |
940 |
collect_procs(ppage, &tokill); |
6a46079cf HWPOISON: The hig... |
941 |
|
a6d30ddda thp: fix the wron... |
942 |
if (hpage != ppage) |
7eaceacca block: remove per... |
943 |
lock_page(ppage); |
a6d30ddda thp: fix the wron... |
944 945 |
ret = try_to_unmap(ppage, ttu); |
6a46079cf HWPOISON: The hig... |
946 947 948 |
if (ret != SWAP_SUCCESS) printk(KERN_ERR "MCE %#lx: failed to unmap page (mapcount=%d) ", |
a6d30ddda thp: fix the wron... |
949 950 951 952 |
pfn, page_mapcount(ppage)); if (hpage != ppage) unlock_page(ppage); |
6a46079cf HWPOISON: The hig... |
953 954 955 956 957 |
/* * Now that the dirty bit has been propagated to the * struct page and all unmaps done we can decide if * killing is needed or not. Only kill when the page |
6751ed65d x86/mce: Fix sigi... |
958 959 |
* was dirty or the process is not restartable, * otherwise the tokill list is merely |
6a46079cf HWPOISON: The hig... |
960 961 962 963 |
* freed. When there was a problem unmapping earlier * use a more force-full uncatchable kill to prevent * any accesses to the poisoned memory. */ |
6751ed65d x86/mce: Fix sigi... |
964 965 |
forcekill = PageDirty(ppage) || (flags & MF_MUST_KILL); kill_procs(&tokill, forcekill, trapno, |
7329bbeb9 HWPOISON: Add cod... |
966 |
ret != SWAP_SUCCESS, p, pfn, flags); |
1668bfd5b HWPOISON: abort o... |
967 968 |
return ret; |
6a46079cf HWPOISON: The hig... |
969 |
} |
7013febc8 HWPOISON, hugetlb... |
970 971 972 |
static void set_page_hwpoison_huge_page(struct page *hpage) { int i; |
37c2ac787 thp: compound_tra... |
973 |
int nr_pages = 1 << compound_trans_order(hpage); |
7013febc8 HWPOISON, hugetlb... |
974 975 976 977 978 979 980 |
for (i = 0; i < nr_pages; i++) SetPageHWPoison(hpage + i); } static void clear_page_hwpoison_huge_page(struct page *hpage) { int i; |
37c2ac787 thp: compound_tra... |
981 |
int nr_pages = 1 << compound_trans_order(hpage); |
7013febc8 HWPOISON, hugetlb... |
982 983 984 |
for (i = 0; i < nr_pages; i++) ClearPageHWPoison(hpage + i); } |
cd42f4a3b HWPOISON: Clean u... |
985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 |
/** * memory_failure - Handle memory failure of a page. * @pfn: Page Number of the corrupted page * @trapno: Trap number reported in the signal to user space. * @flags: fine tune action taken * * This function is called by the low level machine check code * of an architecture when it detects hardware memory corruption * of a page. It tries its best to recover, which includes * dropping pages, killing processes etc. * * The function is primarily of use for corruptions that * happen outside the current execution context (e.g. when * detected by a background scrubber) * * Must run in process context (e.g. a work queue) with interrupts * enabled and no spinlocks hold. */ int memory_failure(unsigned long pfn, int trapno, int flags) |
6a46079cf HWPOISON: The hig... |
1004 1005 1006 |
{ struct page_state *ps; struct page *p; |
7af446a84 HWPOISON, hugetlb... |
1007 |
struct page *hpage; |
6a46079cf HWPOISON: The hig... |
1008 |
int res; |
c9fbdd5f1 HWPOISON, hugetlb... |
1009 |
unsigned int nr_pages; |
524fca1e7 HWPOISON: fix mis... |
1010 |
unsigned long page_flags; |
6a46079cf HWPOISON: The hig... |
1011 1012 1013 1014 1015 |
if (!sysctl_memory_failure_recovery) panic("Memory failure from trap %d on page %lx", trapno, pfn); if (!pfn_valid(pfn)) { |
a7560fc80 HWPOISON: return ... |
1016 1017 1018 1019 1020 |
printk(KERN_ERR "MCE %#lx: memory outside kernel control ", pfn); return -ENXIO; |
6a46079cf HWPOISON: The hig... |
1021 1022 1023 |
} p = pfn_to_page(pfn); |
7af446a84 HWPOISON, hugetlb... |
1024 |
hpage = compound_head(p); |
6a46079cf HWPOISON: The hig... |
1025 |
if (TestSetPageHWPoison(p)) { |
d95ea51e3 HWPOISON: make se... |
1026 1027 |
printk(KERN_ERR "MCE %#lx: already hardware poisoned ", pfn); |
6a46079cf HWPOISON: The hig... |
1028 1029 |
return 0; } |
4db0e950c mm/memory-failure... |
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 |
/* * Currently errors on hugetlbfs pages are measured in hugepage units, * so nr_pages should be 1 << compound_order. OTOH when errors are on * transparent hugepages, they are supposed to be split and error * measurement is done in normal page units. So nr_pages should be one * in this case. */ if (PageHuge(p)) nr_pages = 1 << compound_order(hpage); else /* normal page or thp */ nr_pages = 1; |
293c07e31 memory-failure: u... |
1041 |
atomic_long_add(nr_pages, &num_poisoned_pages); |
6a46079cf HWPOISON: The hig... |
1042 1043 1044 1045 1046 |
/* * We need/can do nothing about count=0 pages. * 1) it's a free page, and therefore in safe hand: * prep_new_page() will be the gate keeper. |
8c6c2ecb4 HWPOSION, hugetlb... |
1047 1048 1049 1050 |
* 2) it's a free hugepage, which is also safe: * an affected hugepage will be dequeued from hugepage freelist, * so there's no concern about reusing it ever after. * 3) it's part of a non-compound high order page. |
6a46079cf HWPOISON: The hig... |
1051 1052 1053 1054 1055 1056 |
* Implies some kernel user: cannot stop them from * R/W the page; let's pray that the page has been * used and will be freed some time later. * In fact it's dangerous to directly bump up page count from 0, * that may make page_freeze_refs()/page_unfreeze_refs() mismatch. */ |
82ba011b9 HWPOISON: Turn re... |
1057 |
if (!(flags & MF_COUNT_INCREASED) && |
7af446a84 HWPOISON, hugetlb... |
1058 |
!get_page_unless_zero(hpage)) { |
8d22ba1b7 HWPOISON: detect ... |
1059 1060 1061 |
if (is_free_buddy_page(p)) { action_result(pfn, "free buddy", DELAYED); return 0; |
8c6c2ecb4 HWPOSION, hugetlb... |
1062 1063 1064 1065 1066 |
} else if (PageHuge(hpage)) { /* * Check "just unpoisoned", "filter hit", and * "race with other subpage." */ |
7eaceacca block: remove per... |
1067 |
lock_page(hpage); |
8c6c2ecb4 HWPOSION, hugetlb... |
1068 1069 1070 |
if (!PageHWPoison(hpage) || (hwpoison_filter(p) && TestClearPageHWPoison(p)) || (p != hpage && TestSetPageHWPoison(hpage))) { |
293c07e31 memory-failure: u... |
1071 |
atomic_long_sub(nr_pages, &num_poisoned_pages); |
8c6c2ecb4 HWPOSION, hugetlb... |
1072 1073 1074 1075 1076 1077 1078 1079 |
return 0; } set_page_hwpoison_huge_page(hpage); res = dequeue_hwpoisoned_huge_page(hpage); action_result(pfn, "free huge", res ? IGNORED : DELAYED); unlock_page(hpage); return res; |
8d22ba1b7 HWPOISON: detect ... |
1080 1081 1082 1083 |
} else { action_result(pfn, "high order kernel", IGNORED); return -EBUSY; } |
6a46079cf HWPOISON: The hig... |
1084 1085 1086 |
} /* |
e43c3afb3 HWPOISON: return ... |
1087 1088 1089 1090 1091 1092 1093 |
* We ignore non-LRU pages for good reasons. * - PG_locked is only well defined for LRU pages and a few others * - to avoid races with __set_page_locked() * - to avoid races with __SetPageSlab*() (and more non-atomic ops) * The check (unnecessarily) ignores LRU pages being isolated and * walked by the page reclaim code, however that's not a big loss. */ |
385de3572 thp: allow a hwpo... |
1094 |
if (!PageHuge(p) && !PageTransTail(p)) { |
af241a083 thp: fix unsuitab... |
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 |
if (!PageLRU(p)) shake_page(p, 0); if (!PageLRU(p)) { /* * shake_page could have turned it free. */ if (is_free_buddy_page(p)) { action_result(pfn, "free buddy, 2nd try", DELAYED); return 0; } action_result(pfn, "non LRU", IGNORED); put_page(p); return -EBUSY; |
0474a60ec HWPOISON: Use new... |
1109 |
} |
e43c3afb3 HWPOISON: return ... |
1110 |
} |
e43c3afb3 HWPOISON: return ... |
1111 1112 |
/* |
6a46079cf HWPOISON: The hig... |
1113 1114 1115 1116 |
* Lock the page and wait for writeback to finish. * It's very difficult to mess with pages currently under IO * and in many cases impossible, so we just avoid it here. */ |
7eaceacca block: remove per... |
1117 |
lock_page(hpage); |
847ce401d HWPOISON: Add unp... |
1118 1119 |
/* |
524fca1e7 HWPOISON: fix mis... |
1120 1121 1122 1123 1124 1125 1126 1127 1128 |
* We use page flags to determine what action should be taken, but * the flags can be modified by the error containment action. One * example is an mlocked page, where PG_mlocked is cleared by * page_remove_rmap() in try_to_unmap_one(). So to determine page status * correctly, we save a copy of the page flags at this time. */ page_flags = p->flags; /* |
847ce401d HWPOISON: Add unp... |
1129 1130 1131 |
* unpoison always clear PG_hwpoison inside page lock */ if (!PageHWPoison(p)) { |
d95ea51e3 HWPOISON: make se... |
1132 1133 |
printk(KERN_ERR "MCE %#lx: just unpoisoned ", pfn); |
847ce401d HWPOISON: Add unp... |
1134 1135 1136 |
res = 0; goto out; } |
7c116f2b0 HWPOISON: add fs/... |
1137 1138 |
if (hwpoison_filter(p)) { if (TestClearPageHWPoison(p)) |
293c07e31 memory-failure: u... |
1139 |
atomic_long_sub(nr_pages, &num_poisoned_pages); |
7af446a84 HWPOISON, hugetlb... |
1140 1141 |
unlock_page(hpage); put_page(hpage); |
7c116f2b0 HWPOISON: add fs/... |
1142 1143 |
return 0; } |
847ce401d HWPOISON: Add unp... |
1144 |
|
7013febc8 HWPOISON, hugetlb... |
1145 1146 1147 1148 |
/* * For error on the tail page, we should set PG_hwpoison * on the head page to show that the hugepage is hwpoisoned */ |
a6d30ddda thp: fix the wron... |
1149 |
if (PageHuge(p) && PageTail(p) && TestSetPageHWPoison(hpage)) { |
7013febc8 HWPOISON, hugetlb... |
1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 |
action_result(pfn, "hugepage already hardware poisoned", IGNORED); unlock_page(hpage); put_page(hpage); return 0; } /* * Set PG_hwpoison on all pages in an error hugepage, * because containment is done in hugepage unit for now. * Since we have done TestSetPageHWPoison() for the head page with * page lock held, we can safely set PG_hwpoison bits on tail pages. */ if (PageHuge(p)) set_page_hwpoison_huge_page(hpage); |
6a46079cf HWPOISON: The hig... |
1164 1165 1166 1167 |
wait_on_page_writeback(p); /* * Now take care of user space mappings. |
e64a782fe mm: change __remo... |
1168 |
* Abort on fail: __delete_from_page_cache() assumes unmapped page. |
6a46079cf HWPOISON: The hig... |
1169 |
*/ |
7329bbeb9 HWPOISON: Add cod... |
1170 |
if (hwpoison_user_mappings(p, pfn, trapno, flags) != SWAP_SUCCESS) { |
1668bfd5b HWPOISON: abort o... |
1171 1172 1173 1174 1175 |
printk(KERN_ERR "MCE %#lx: cannot unmap page, give up ", pfn); res = -EBUSY; goto out; } |
6a46079cf HWPOISON: The hig... |
1176 1177 1178 1179 |
/* * Torn down by someone else? */ |
dc2a1cbf7 HWPOISON: introdu... |
1180 |
if (PageLRU(p) && !PageSwapCache(p) && p->mapping == NULL) { |
6a46079cf HWPOISON: The hig... |
1181 |
action_result(pfn, "already truncated LRU", IGNORED); |
d95ea51e3 HWPOISON: make se... |
1182 |
res = -EBUSY; |
6a46079cf HWPOISON: The hig... |
1183 1184 1185 1186 |
goto out; } res = -EBUSY; |
524fca1e7 HWPOISON: fix mis... |
1187 1188 1189 1190 1191 1192 1193 |
/* * The first check uses the current page flags which may not have any * relevant information. The second check with the saved page flagss is * carried out only if the first check can't determine the page status. */ for (ps = error_states;; ps++) if ((p->flags & ps->mask) == ps->res) |
6a46079cf HWPOISON: The hig... |
1194 |
break; |
524fca1e7 HWPOISON: fix mis... |
1195 1196 1197 1198 1199 |
if (!ps->mask) for (ps = error_states;; ps++) if ((page_flags & ps->mask) == ps->res) break; res = page_action(ps, p, pfn); |
6a46079cf HWPOISON: The hig... |
1200 |
out: |
7af446a84 HWPOISON, hugetlb... |
1201 |
unlock_page(hpage); |
6a46079cf HWPOISON: The hig... |
1202 1203 |
return res; } |
cd42f4a3b HWPOISON: Clean u... |
1204 |
EXPORT_SYMBOL_GPL(memory_failure); |
847ce401d HWPOISON: Add unp... |
1205 |
|
ea8f5fb8a HWPoison: add mem... |
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 |
#define MEMORY_FAILURE_FIFO_ORDER 4 #define MEMORY_FAILURE_FIFO_SIZE (1 << MEMORY_FAILURE_FIFO_ORDER) struct memory_failure_entry { unsigned long pfn; int trapno; int flags; }; struct memory_failure_cpu { DECLARE_KFIFO(fifo, struct memory_failure_entry, MEMORY_FAILURE_FIFO_SIZE); spinlock_t lock; struct work_struct work; }; static DEFINE_PER_CPU(struct memory_failure_cpu, memory_failure_cpu); /** * memory_failure_queue - Schedule handling memory failure of a page. * @pfn: Page Number of the corrupted page * @trapno: Trap number reported in the signal to user space. * @flags: Flags for memory failure handling * * This function is called by the low level hardware error handler * when it detects hardware memory corruption of a page. It schedules * the recovering of error page, including dropping pages, killing * processes etc. * * The function is primarily of use for corruptions that * happen outside the current execution context (e.g. when * detected by a background scrubber) * * Can run in IRQ context. */ void memory_failure_queue(unsigned long pfn, int trapno, int flags) { struct memory_failure_cpu *mf_cpu; unsigned long proc_flags; struct memory_failure_entry entry = { .pfn = pfn, .trapno = trapno, .flags = flags, }; mf_cpu = &get_cpu_var(memory_failure_cpu); spin_lock_irqsave(&mf_cpu->lock, proc_flags); if (kfifo_put(&mf_cpu->fifo, &entry)) schedule_work_on(smp_processor_id(), &mf_cpu->work); else pr_err("Memory failure: buffer overflow when queuing memory failure at 0x%#lx ", pfn); spin_unlock_irqrestore(&mf_cpu->lock, proc_flags); put_cpu_var(memory_failure_cpu); } EXPORT_SYMBOL_GPL(memory_failure_queue); static void memory_failure_work_func(struct work_struct *work) { struct memory_failure_cpu *mf_cpu; struct memory_failure_entry entry = { 0, }; unsigned long proc_flags; int gotten; mf_cpu = &__get_cpu_var(memory_failure_cpu); for (;;) { spin_lock_irqsave(&mf_cpu->lock, proc_flags); gotten = kfifo_get(&mf_cpu->fifo, &entry); spin_unlock_irqrestore(&mf_cpu->lock, proc_flags); if (!gotten) break; |
cd42f4a3b HWPOISON: Clean u... |
1278 |
memory_failure(entry.pfn, entry.trapno, entry.flags); |
ea8f5fb8a HWPoison: add mem... |
1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 |
} } static int __init memory_failure_init(void) { struct memory_failure_cpu *mf_cpu; int cpu; for_each_possible_cpu(cpu) { mf_cpu = &per_cpu(memory_failure_cpu, cpu); spin_lock_init(&mf_cpu->lock); INIT_KFIFO(mf_cpu->fifo); INIT_WORK(&mf_cpu->work, memory_failure_work_func); } return 0; } core_initcall(memory_failure_init); |
847ce401d HWPOISON: Add unp... |
1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 |
/** * unpoison_memory - Unpoison a previously poisoned page * @pfn: Page number of the to be unpoisoned page * * Software-unpoison a page that has been poisoned by * memory_failure() earlier. * * This is only done on the software-level, so it only works * for linux injected failures, not real hardware failures * * Returns 0 for success, otherwise -errno. */ int unpoison_memory(unsigned long pfn) { struct page *page; struct page *p; int freeit = 0; |
c9fbdd5f1 HWPOISON, hugetlb... |
1314 |
unsigned int nr_pages; |
847ce401d HWPOISON: Add unp... |
1315 1316 1317 1318 1319 1320 1321 1322 |
if (!pfn_valid(pfn)) return -ENXIO; p = pfn_to_page(pfn); page = compound_head(p); if (!PageHWPoison(p)) { |
fb46e7352 HWPOISON: Convert... |
1323 1324 |
pr_info("MCE: Page was already unpoisoned %#lx ", pfn); |
847ce401d HWPOISON: Add unp... |
1325 1326 |
return 0; } |
37c2ac787 thp: compound_tra... |
1327 |
nr_pages = 1 << compound_trans_order(page); |
c9fbdd5f1 HWPOISON, hugetlb... |
1328 |
|
847ce401d HWPOISON: Add unp... |
1329 |
if (!get_page_unless_zero(page)) { |
8c6c2ecb4 HWPOSION, hugetlb... |
1330 1331 1332 1333 1334 1335 1336 |
/* * Since HWPoisoned hugepage should have non-zero refcount, * race between memory failure and unpoison seems to happen. * In such case unpoison fails and memory failure runs * to the end. */ if (PageHuge(page)) { |
dd73e85f6 HWPOISON: convert... |
1337 1338 |
pr_info("MCE: Memory failure is now running on free hugepage %#lx ", pfn); |
8c6c2ecb4 HWPOSION, hugetlb... |
1339 1340 |
return 0; } |
847ce401d HWPOISON: Add unp... |
1341 |
if (TestClearPageHWPoison(p)) |
293c07e31 memory-failure: u... |
1342 |
atomic_long_sub(nr_pages, &num_poisoned_pages); |
fb46e7352 HWPOISON: Convert... |
1343 1344 |
pr_info("MCE: Software-unpoisoned free page %#lx ", pfn); |
847ce401d HWPOISON: Add unp... |
1345 1346 |
return 0; } |
7eaceacca block: remove per... |
1347 |
lock_page(page); |
847ce401d HWPOISON: Add unp... |
1348 1349 1350 1351 1352 1353 |
/* * This test is racy because PG_hwpoison is set outside of page lock. * That's acceptable because that won't trigger kernel panic. Instead, * the PG_hwpoison page will be caught and isolated on the entrance to * the free buddy page pool. */ |
c9fbdd5f1 HWPOISON, hugetlb... |
1354 |
if (TestClearPageHWPoison(page)) { |
fb46e7352 HWPOISON: Convert... |
1355 1356 |
pr_info("MCE: Software-unpoisoned page %#lx ", pfn); |
293c07e31 memory-failure: u... |
1357 |
atomic_long_sub(nr_pages, &num_poisoned_pages); |
847ce401d HWPOISON: Add unp... |
1358 |
freeit = 1; |
6a90181c7 HWPOISON, hugetlb... |
1359 1360 |
if (PageHuge(page)) clear_page_hwpoison_huge_page(page); |
847ce401d HWPOISON: Add unp... |
1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 |
} unlock_page(page); put_page(page); if (freeit) put_page(page); return 0; } EXPORT_SYMBOL(unpoison_memory); |
facb6011f HWPOISON: Add sof... |
1371 1372 1373 |
static struct page *new_page(struct page *p, unsigned long private, int **x) { |
12686d153 HWPOISON: Try to ... |
1374 |
int nid = page_to_nid(p); |
d950b9588 HWPOISON, hugetlb... |
1375 1376 1377 1378 1379 |
if (PageHuge(p)) return alloc_huge_page_node(page_hstate(compound_head(p)), nid); else return alloc_pages_exact_node(nid, GFP_HIGHUSER_MOVABLE, 0); |
facb6011f HWPOISON: Add sof... |
1380 1381 1382 1383 1384 1385 1386 1387 |
} /* * Safely get reference count of an arbitrary page. * Returns 0 for a free page, -EIO for a zero refcount page * that is not free, and 1 for any other page type. * For 1 the page is returned with increased page count, otherwise not. */ |
af8fae7c0 mm/memory-failure... |
1388 |
static int __get_any_page(struct page *p, unsigned long pfn, int flags) |
facb6011f HWPOISON: Add sof... |
1389 1390 1391 1392 1393 1394 1395 |
{ int ret; if (flags & MF_COUNT_INCREASED) return 1; /* |
20d6c96b5 mem-hotplug: intr... |
1396 |
* The lock_memory_hotplug prevents a race with memory hotplug. |
facb6011f HWPOISON: Add sof... |
1397 1398 |
* This is a big hammer, a better would be nicer. */ |
20d6c96b5 mem-hotplug: intr... |
1399 |
lock_memory_hotplug(); |
facb6011f HWPOISON: Add sof... |
1400 1401 1402 1403 1404 |
/* * Isolate the page, so that it doesn't get reallocated if it * was free. */ |
b023f4681 memory-hotplug: s... |
1405 |
set_migratetype_isolate(p, true); |
d950b9588 HWPOISON, hugetlb... |
1406 1407 1408 1409 |
/* * When the target page is a free hugepage, just remove it * from free hugepage list. */ |
facb6011f HWPOISON: Add sof... |
1410 |
if (!get_page_unless_zero(compound_head(p))) { |
d950b9588 HWPOISON, hugetlb... |
1411 |
if (PageHuge(p)) { |
71dd0b8ae mm/memory_failure... |
1412 1413 |
pr_info("%s: %#lx free huge page ", __func__, pfn); |
af8fae7c0 mm/memory-failure... |
1414 |
ret = 0; |
d950b9588 HWPOISON, hugetlb... |
1415 |
} else if (is_free_buddy_page(p)) { |
71dd0b8ae mm/memory_failure... |
1416 1417 |
pr_info("%s: %#lx free buddy page ", __func__, pfn); |
facb6011f HWPOISON: Add sof... |
1418 1419 |
ret = 0; } else { |
71dd0b8ae mm/memory_failure... |
1420 1421 1422 |
pr_info("%s: %#lx: unknown zero refcount page type %lx ", __func__, pfn, p->flags); |
facb6011f HWPOISON: Add sof... |
1423 1424 1425 1426 1427 1428 |
ret = -EIO; } } else { /* Not a free page */ ret = 1; } |
0815f3d81 mm: page_isolatio... |
1429 |
unset_migratetype_isolate(p, MIGRATE_MOVABLE); |
20d6c96b5 mem-hotplug: intr... |
1430 |
unlock_memory_hotplug(); |
facb6011f HWPOISON: Add sof... |
1431 1432 |
return ret; } |
af8fae7c0 mm/memory-failure... |
1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 |
static int get_any_page(struct page *page, unsigned long pfn, int flags) { int ret = __get_any_page(page, pfn, flags); if (ret == 1 && !PageHuge(page) && !PageLRU(page)) { /* * Try to free it. */ put_page(page); shake_page(page, 1); /* * Did it turn free? */ ret = __get_any_page(page, pfn, 0); if (!PageLRU(page)) { pr_info("soft_offline: %#lx: unknown non LRU page type %lx ", pfn, page->flags); return -EIO; } } return ret; } |
d950b9588 HWPOISON, hugetlb... |
1457 1458 1459 1460 1461 |
static int soft_offline_huge_page(struct page *page, int flags) { int ret; unsigned long pfn = page_to_pfn(page); struct page *hpage = compound_head(page); |
d950b9588 HWPOISON, hugetlb... |
1462 |
|
af8fae7c0 mm/memory-failure... |
1463 1464 1465 1466 1467 |
/* * This double-check of PageHWPoison is to avoid the race with * memory_failure(). See also comment in __soft_offline_page(). */ lock_page(hpage); |
0ebff32c3 memory-failure: f... |
1468 |
if (PageHWPoison(hpage)) { |
af8fae7c0 mm/memory-failure... |
1469 1470 |
unlock_page(hpage); put_page(hpage); |
0ebff32c3 memory-failure: f... |
1471 1472 |
pr_info("soft offline: %#lx hugepage already poisoned ", pfn); |
af8fae7c0 mm/memory-failure... |
1473 |
return -EBUSY; |
0ebff32c3 memory-failure: f... |
1474 |
} |
af8fae7c0 mm/memory-failure... |
1475 |
unlock_page(hpage); |
d950b9588 HWPOISON, hugetlb... |
1476 |
|
d950b9588 HWPOISON, hugetlb... |
1477 |
/* Keep page count to indicate a given hugepage is isolated. */ |
9c620e2bc mm: remove offlin... |
1478 |
ret = migrate_huge_page(hpage, new_page, MPOL_MF_MOVE_ALL, |
dc32f6345 mm: fix wrong arg... |
1479 |
MIGRATE_SYNC); |
189ebff28 hugetlb: simplify... |
1480 |
put_page(hpage); |
d950b9588 HWPOISON, hugetlb... |
1481 |
if (ret) { |
dd73e85f6 HWPOISON: convert... |
1482 1483 1484 |
pr_info("soft offline: %#lx: migration failed %d, type %lx ", pfn, ret, page->flags); |
af8fae7c0 mm/memory-failure... |
1485 1486 1487 1488 1489 |
} else { set_page_hwpoison_huge_page(hpage); dequeue_hwpoisoned_huge_page(hpage); atomic_long_add(1 << compound_trans_order(hpage), &num_poisoned_pages); |
d950b9588 HWPOISON, hugetlb... |
1490 |
} |
0ebff32c3 memory-failure: f... |
1491 |
/* keep elevated page count for bad page */ |
d950b9588 HWPOISON, hugetlb... |
1492 1493 |
return ret; } |
af8fae7c0 mm/memory-failure... |
1494 |
static int __soft_offline_page(struct page *page, int flags); |
facb6011f HWPOISON: Add sof... |
1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 |
/** * soft_offline_page - Soft offline a page. * @page: page to offline * @flags: flags. Same as memory_failure(). * * Returns 0 on success, otherwise negated errno. * * Soft offline a page, by migration or invalidation, * without killing anything. This is for the case when * a page is not corrupted yet (so it's still valid to access), * but has had a number of corrected errors and is better taken * out. * * The actual policy on when to do that is maintained by * user space. * * This should never impact any application or cause data loss, * however it might take some time. * * This is not a 100% solution for all memory, but tries to be * ``good enough'' for the majority of memory. */ int soft_offline_page(struct page *page, int flags) { int ret; unsigned long pfn = page_to_pfn(page); |
783657a7d mm: soft offline:... |
1521 |
struct page *hpage = compound_trans_head(page); |
facb6011f HWPOISON: Add sof... |
1522 |
|
af8fae7c0 mm/memory-failure... |
1523 1524 1525 1526 |
if (PageHWPoison(page)) { pr_info("soft offline: %#lx page already poisoned ", pfn); return -EBUSY; |
fa8dd8a92 memory-failure: d... |
1527 |
} |
af8fae7c0 mm/memory-failure... |
1528 |
if (!PageHuge(page) && PageTransHuge(hpage)) { |
783657a7d mm: soft offline:... |
1529 1530 1531 1532 |
if (PageAnon(hpage) && unlikely(split_huge_page(hpage))) { pr_info("soft offline: %#lx: failed to split THP ", pfn); |
af8fae7c0 mm/memory-failure... |
1533 |
return -EBUSY; |
783657a7d mm: soft offline:... |
1534 1535 |
} } |
d950b9588 HWPOISON, hugetlb... |
1536 |
|
facb6011f HWPOISON: Add sof... |
1537 1538 |
ret = get_any_page(page, pfn, flags); if (ret < 0) |
af8fae7c0 mm/memory-failure... |
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 |
return ret; if (ret) { /* for in-use pages */ if (PageHuge(page)) ret = soft_offline_huge_page(page, flags); else ret = __soft_offline_page(page, flags); } else { /* for free pages */ if (PageHuge(page)) { set_page_hwpoison_huge_page(hpage); dequeue_hwpoisoned_huge_page(hpage); atomic_long_add(1 << compound_trans_order(hpage), &num_poisoned_pages); } else { SetPageHWPoison(page); atomic_long_inc(&num_poisoned_pages); } |
facb6011f HWPOISON: Add sof... |
1555 |
} |
af8fae7c0 mm/memory-failure... |
1556 1557 1558 1559 1560 1561 1562 1563 |
/* keep elevated page count for bad page */ return ret; } static int __soft_offline_page(struct page *page, int flags) { int ret; unsigned long pfn = page_to_pfn(page); |
facb6011f HWPOISON: Add sof... |
1564 |
|
facb6011f HWPOISON: Add sof... |
1565 |
/* |
af8fae7c0 mm/memory-failure... |
1566 1567 1568 1569 |
* Check PageHWPoison again inside page lock because PageHWPoison * is set by memory_failure() outside page lock. Note that * memory_failure() also double-checks PageHWPoison inside page lock, * so there's no race between soft_offline_page() and memory_failure(). |
facb6011f HWPOISON: Add sof... |
1570 |
*/ |
0ebff32c3 memory-failure: f... |
1571 1572 |
lock_page(page); wait_on_page_writeback(page); |
af8fae7c0 mm/memory-failure... |
1573 1574 1575 1576 1577 1578 1579 |
if (PageHWPoison(page)) { unlock_page(page); put_page(page); pr_info("soft offline: %#lx page already poisoned ", pfn); return -EBUSY; } |
facb6011f HWPOISON: Add sof... |
1580 1581 1582 1583 1584 1585 |
/* * Try to invalidate first. This should work for * non dirty unmapped page cache pages. */ ret = invalidate_inode_page(page); unlock_page(page); |
facb6011f HWPOISON: Add sof... |
1586 |
/* |
facb6011f HWPOISON: Add sof... |
1587 1588 1589 |
* RED-PEN would be better to keep it isolated here, but we * would need to fix isolation locking first. */ |
facb6011f HWPOISON: Add sof... |
1590 |
if (ret == 1) { |
bd486285f mem-hwpoison: fix... |
1591 |
put_page(page); |
fb46e7352 HWPOISON: Convert... |
1592 1593 |
pr_info("soft_offline: %#lx: invalidated ", pfn); |
af8fae7c0 mm/memory-failure... |
1594 1595 1596 |
SetPageHWPoison(page); atomic_long_inc(&num_poisoned_pages); return 0; |
facb6011f HWPOISON: Add sof... |
1597 1598 1599 1600 1601 1602 1603 1604 |
} /* * Simple invalidation didn't work. * Try to migrate to a new page instead. migrate.c * handles a large number of cases for us. */ ret = isolate_lru_page(page); |
bd486285f mem-hwpoison: fix... |
1605 1606 1607 1608 1609 |
/* * Drop page reference which is came from get_any_page() * successful isolate_lru_page() already took another one. */ put_page(page); |
facb6011f HWPOISON: Add sof... |
1610 1611 |
if (!ret) { LIST_HEAD(pagelist); |
5db8a73a8 mm/memory-failure... |
1612 |
inc_zone_page_state(page, NR_ISOLATED_ANON + |
9c620e2bc mm: remove offlin... |
1613 |
page_is_file_cache(page)); |
facb6011f HWPOISON: Add sof... |
1614 |
list_add(&page->lru, &pagelist); |
77f1fe6b0 mm: migration: al... |
1615 |
ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, |
9c620e2bc mm: remove offlin... |
1616 |
MIGRATE_SYNC, MR_MEMORY_FAILURE); |
facb6011f HWPOISON: Add sof... |
1617 |
if (ret) { |
57fc4a5ee mm: when migrate_... |
1618 |
putback_lru_pages(&pagelist); |
fb46e7352 HWPOISON: Convert... |
1619 1620 |
pr_info("soft offline: %#lx: migration failed %d, type %lx ", |
facb6011f HWPOISON: Add sof... |
1621 1622 1623 |
pfn, ret, page->flags); if (ret > 0) ret = -EIO; |
af8fae7c0 mm/memory-failure... |
1624 1625 1626 |
} else { SetPageHWPoison(page); atomic_long_inc(&num_poisoned_pages); |
facb6011f HWPOISON: Add sof... |
1627 1628 |
} } else { |
fb46e7352 HWPOISON: Convert... |
1629 1630 |
pr_info("soft offline: %#lx: isolation failed: %d, page count %d, type %lx ", |
dd73e85f6 HWPOISON: convert... |
1631 |
pfn, ret, page_count(page), page->flags); |
facb6011f HWPOISON: Add sof... |
1632 |
} |
facb6011f HWPOISON: Add sof... |
1633 1634 |
return ret; } |