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fs/f2fs/trace.c
3.41 KB
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// SPDX-License-Identifier: GPL-2.0 |
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/* * f2fs IO tracer * * Copyright (c) 2014 Motorola Mobility * Copyright (c) 2014 Jaegeuk Kim <jaegeuk@kernel.org> |
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*/ #include <linux/fs.h> #include <linux/f2fs_fs.h> #include <linux/sched.h> |
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#include <linux/radix-tree.h> |
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#include "f2fs.h" #include "trace.h" |
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static RADIX_TREE(pids, GFP_ATOMIC); |
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static spinlock_t pids_lock; |
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static struct last_io_info last_io; |
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static inline void __print_last_io(void) { if (!last_io.len) return; |
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trace_printk("%3x:%3x %4x %-16s %2x %5x %5x %12x %4x ", |
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last_io.major, last_io.minor, last_io.pid, "----------------", last_io.type, |
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last_io.fio.op, last_io.fio.op_flags, |
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last_io.fio.new_blkaddr, |
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last_io.len); memset(&last_io, 0, sizeof(last_io)); } static int __file_type(struct inode *inode, pid_t pid) { if (f2fs_is_atomic_file(inode)) return __ATOMIC_FILE; else if (f2fs_is_volatile_file(inode)) return __VOLATILE_FILE; else if (S_ISDIR(inode->i_mode)) return __DIR_FILE; else if (inode->i_ino == F2FS_NODE_INO(F2FS_I_SB(inode))) return __NODE_FILE; else if (inode->i_ino == F2FS_META_INO(F2FS_I_SB(inode))) return __META_FILE; else if (pid) return __NORMAL_FILE; else return __MISC_FILE; } |
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void f2fs_trace_pid(struct page *page) { |
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struct inode *inode = page->mapping->host; pid_t pid = task_pid_nr(current); void *p; |
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set_page_private(page, (unsigned long)pid); |
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|
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retry: |
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if (radix_tree_preload(GFP_NOFS)) return; |
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spin_lock(&pids_lock); |
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p = radix_tree_lookup(&pids, pid); if (p == current) |
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goto out; |
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if (p) radix_tree_delete(&pids, pid); |
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if (radix_tree_insert(&pids, pid, current)) { spin_unlock(&pids_lock); radix_tree_preload_end(); cond_resched(); goto retry; } |
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trace_printk("%3x:%3x %4x %-16s ", MAJOR(inode->i_sb->s_dev), MINOR(inode->i_sb->s_dev), pid, current->comm); |
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out: |
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spin_unlock(&pids_lock); |
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radix_tree_preload_end(); |
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} |
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void f2fs_trace_ios(struct f2fs_io_info *fio, int flush) |
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{ |
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struct inode *inode; pid_t pid; int major, minor; if (flush) { __print_last_io(); return; } |
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inode = fio->page->mapping->host; pid = page_private(fio->page); |
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major = MAJOR(inode->i_sb->s_dev); minor = MINOR(inode->i_sb->s_dev); if (last_io.major == major && last_io.minor == minor && last_io.pid == pid && last_io.type == __file_type(inode, pid) && |
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last_io.fio.op == fio->op && last_io.fio.op_flags == fio->op_flags && |
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last_io.fio.new_blkaddr + last_io.len == fio->new_blkaddr) { |
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last_io.len++; return; } __print_last_io(); last_io.major = major; last_io.minor = minor; last_io.pid = pid; last_io.type = __file_type(inode, pid); last_io.fio = *fio; last_io.len = 1; return; |
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} |
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void f2fs_build_trace_ios(void) { |
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spin_lock_init(&pids_lock); |
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} |
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#define PIDVEC_SIZE 128 static unsigned int gang_lookup_pids(pid_t *results, unsigned long first_index, unsigned int max_items) { struct radix_tree_iter iter; void **slot; unsigned int ret = 0; if (unlikely(!max_items)) return 0; radix_tree_for_each_slot(slot, &pids, &iter, first_index) { results[ret] = iter.index; |
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if (++ret == max_items) |
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break; } return ret; } void f2fs_destroy_trace_ios(void) { pid_t pid[PIDVEC_SIZE]; pid_t next_pid = 0; unsigned int found; |
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spin_lock(&pids_lock); |
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while ((found = gang_lookup_pids(pid, next_pid, PIDVEC_SIZE))) { unsigned idx; next_pid = pid[found - 1] + 1; for (idx = 0; idx < found; idx++) radix_tree_delete(&pids, pid[idx]); } |
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spin_unlock(&pids_lock); |
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} |