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mm/vmstat.c
33.1 KB
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/* * linux/mm/vmstat.c * * Manages VM statistics * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
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* * zoned VM statistics * Copyright (C) 2006 Silicon Graphics, Inc., * Christoph Lameter <christoph@lameter.com> |
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*/ |
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#include <linux/fs.h> |
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#include <linux/mm.h> |
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#include <linux/err.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/cpu.h> |
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#include <linux/vmstat.h> |
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#include <linux/sched.h> |
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#include <linux/math64.h> |
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#include <linux/writeback.h> |
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#include <linux/compaction.h> |
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#ifdef CONFIG_VM_EVENT_COUNTERS DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}}; EXPORT_PER_CPU_SYMBOL(vm_event_states); |
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static void sum_vm_events(unsigned long *ret) |
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{ |
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int cpu; |
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int i; memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long)); |
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for_each_online_cpu(cpu) { |
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struct vm_event_state *this = &per_cpu(vm_event_states, cpu); |
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for (i = 0; i < NR_VM_EVENT_ITEMS; i++) ret[i] += this->event[i]; } } /* * Accumulate the vm event counters across all CPUs. * The result is unavoidably approximate - it can change * during and after execution of this function. */ void all_vm_events(unsigned long *ret) { |
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get_online_cpus(); |
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sum_vm_events(ret); |
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put_online_cpus(); |
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} |
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EXPORT_SYMBOL_GPL(all_vm_events); |
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#ifdef CONFIG_HOTPLUG /* * Fold the foreign cpu events into our own. * * This is adding to the events on one processor * but keeps the global counts constant. */ void vm_events_fold_cpu(int cpu) { struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu); int i; for (i = 0; i < NR_VM_EVENT_ITEMS; i++) { count_vm_events(i, fold_state->event[i]); fold_state->event[i] = 0; } } #endif /* CONFIG_HOTPLUG */ #endif /* CONFIG_VM_EVENT_COUNTERS */ |
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/* * Manage combined zone based / global counters * * vm_stat contains the global counters */ atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; EXPORT_SYMBOL(vm_stat); #ifdef CONFIG_SMP |
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int calculate_pressure_threshold(struct zone *zone) |
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{ int threshold; int watermark_distance; /* * As vmstats are not up to date, there is drift between the estimated * and real values. For high thresholds and a high number of CPUs, it * is possible for the min watermark to be breached while the estimated * value looks fine. The pressure threshold is a reduced value such * that even the maximum amount of drift will not accidentally breach * the min watermark */ watermark_distance = low_wmark_pages(zone) - min_wmark_pages(zone); threshold = max(1, (int)(watermark_distance / num_online_cpus())); /* * Maximum threshold is 125 */ threshold = min(125, threshold); return threshold; } |
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int calculate_normal_threshold(struct zone *zone) |
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{ int threshold; int mem; /* memory in 128 MB units */ /* * The threshold scales with the number of processors and the amount * of memory per zone. More memory means that we can defer updates for * longer, more processors could lead to more contention. * fls() is used to have a cheap way of logarithmic scaling. * * Some sample thresholds: * * Threshold Processors (fls) Zonesize fls(mem+1) * ------------------------------------------------------------------ * 8 1 1 0.9-1 GB 4 * 16 2 2 0.9-1 GB 4 * 20 2 2 1-2 GB 5 * 24 2 2 2-4 GB 6 * 28 2 2 4-8 GB 7 * 32 2 2 8-16 GB 8 * 4 2 2 <128M 1 * 30 4 3 2-4 GB 5 * 48 4 3 8-16 GB 8 * 32 8 4 1-2 GB 4 * 32 8 4 0.9-1GB 4 * 10 16 5 <128M 1 * 40 16 5 900M 4 * 70 64 7 2-4 GB 5 * 84 64 7 4-8 GB 6 * 108 512 9 4-8 GB 6 * 125 1024 10 8-16 GB 8 * 125 1024 10 16-32 GB 9 */ mem = zone->present_pages >> (27 - PAGE_SHIFT); threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem)); /* * Maximum threshold is 125 */ threshold = min(125, threshold); return threshold; } |
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/* |
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* Refresh the thresholds for each zone. |
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*/ |
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void refresh_zone_stat_thresholds(void) |
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{ |
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struct zone *zone; int cpu; int threshold; |
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for_each_populated_zone(zone) { |
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unsigned long max_drift, tolerate_drift; |
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threshold = calculate_normal_threshold(zone); |
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for_each_online_cpu(cpu) |
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per_cpu_ptr(zone->pageset, cpu)->stat_threshold = threshold; |
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/* * Only set percpu_drift_mark if there is a danger that * NR_FREE_PAGES reports the low watermark is ok when in fact * the min watermark could be breached by an allocation */ tolerate_drift = low_wmark_pages(zone) - min_wmark_pages(zone); max_drift = num_online_cpus() * threshold; if (max_drift > tolerate_drift) zone->percpu_drift_mark = high_wmark_pages(zone) + max_drift; |
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} |
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} |
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void set_pgdat_percpu_threshold(pg_data_t *pgdat, int (*calculate_pressure)(struct zone *)) |
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{ struct zone *zone; int cpu; int threshold; int i; |
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for (i = 0; i < pgdat->nr_zones; i++) { zone = &pgdat->node_zones[i]; if (!zone->percpu_drift_mark) continue; |
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threshold = (*calculate_pressure)(zone); for_each_possible_cpu(cpu) |
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per_cpu_ptr(zone->pageset, cpu)->stat_threshold = threshold; } |
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} |
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/* * For use when we know that interrupts are disabled. */ void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, int delta) { |
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struct per_cpu_pageset __percpu *pcp = zone->pageset; s8 __percpu *p = pcp->vm_stat_diff + item; |
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long x; |
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long t; x = delta + __this_cpu_read(*p); |
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t = __this_cpu_read(pcp->stat_threshold); |
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if (unlikely(x > t || x < -t)) { |
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zone_page_state_add(x, zone, item); x = 0; } |
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__this_cpu_write(*p, x); |
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} EXPORT_SYMBOL(__mod_zone_page_state); /* |
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* Optimized increment and decrement functions. * * These are only for a single page and therefore can take a struct page * * argument instead of struct zone *. This allows the inclusion of the code * generated for page_zone(page) into the optimized functions. * * No overflow check is necessary and therefore the differential can be * incremented or decremented in place which may allow the compilers to * generate better code. |
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* The increment or decrement is known and therefore one boundary check can * be omitted. * |
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* NOTE: These functions are very performance sensitive. Change only * with care. * |
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* Some processors have inc/dec instructions that are atomic vs an interrupt. * However, the code must first determine the differential location in a zone * based on the processor number and then inc/dec the counter. There is no * guarantee without disabling preemption that the processor will not change * in between and therefore the atomicity vs. interrupt cannot be exploited * in a useful way here. */ |
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void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
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{ |
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struct per_cpu_pageset __percpu *pcp = zone->pageset; s8 __percpu *p = pcp->vm_stat_diff + item; s8 v, t; |
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v = __this_cpu_inc_return(*p); |
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t = __this_cpu_read(pcp->stat_threshold); if (unlikely(v > t)) { s8 overstep = t >> 1; |
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zone_page_state_add(v + overstep, zone, item); __this_cpu_write(*p, -overstep); |
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} } |
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void __inc_zone_page_state(struct page *page, enum zone_stat_item item) { __inc_zone_state(page_zone(page), item); } |
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EXPORT_SYMBOL(__inc_zone_page_state); |
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void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
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{ |
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struct per_cpu_pageset __percpu *pcp = zone->pageset; s8 __percpu *p = pcp->vm_stat_diff + item; s8 v, t; |
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v = __this_cpu_dec_return(*p); |
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t = __this_cpu_read(pcp->stat_threshold); if (unlikely(v < - t)) { s8 overstep = t >> 1; |
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zone_page_state_add(v - overstep, zone, item); __this_cpu_write(*p, overstep); |
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} } |
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void __dec_zone_page_state(struct page *page, enum zone_stat_item item) { __dec_zone_state(page_zone(page), item); } |
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EXPORT_SYMBOL(__dec_zone_page_state); |
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#ifdef CONFIG_CMPXCHG_LOCAL /* * If we have cmpxchg_local support then we do not need to incur the overhead * that comes with local_irq_save/restore if we use this_cpu_cmpxchg. * * mod_state() modifies the zone counter state through atomic per cpu * operations. * * Overstep mode specifies how overstep should handled: * 0 No overstepping * 1 Overstepping half of threshold * -1 Overstepping minus half of threshold */ static inline void mod_state(struct zone *zone, enum zone_stat_item item, int delta, int overstep_mode) { struct per_cpu_pageset __percpu *pcp = zone->pageset; s8 __percpu *p = pcp->vm_stat_diff + item; long o, n, t, z; do { z = 0; /* overflow to zone counters */ /* * The fetching of the stat_threshold is racy. We may apply * a counter threshold to the wrong the cpu if we get |
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* rescheduled while executing here. However, the next * counter update will apply the threshold again and * therefore bring the counter under the threshold again. * * Most of the time the thresholds are the same anyways * for all cpus in a zone. |
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*/ t = this_cpu_read(pcp->stat_threshold); o = this_cpu_read(*p); n = delta + o; if (n > t || n < -t) { int os = overstep_mode * (t >> 1) ; /* Overflow must be added to zone counters */ z = n + os; n = -os; } } while (this_cpu_cmpxchg(*p, o, n) != o); if (z) zone_page_state_add(z, zone, item); } void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, int delta) { mod_state(zone, item, delta, 0); } EXPORT_SYMBOL(mod_zone_page_state); void inc_zone_state(struct zone *zone, enum zone_stat_item item) { mod_state(zone, item, 1, 1); } void inc_zone_page_state(struct page *page, enum zone_stat_item item) { mod_state(page_zone(page), item, 1, 1); } EXPORT_SYMBOL(inc_zone_page_state); void dec_zone_page_state(struct page *page, enum zone_stat_item item) { mod_state(page_zone(page), item, -1, -1); } EXPORT_SYMBOL(dec_zone_page_state); #else /* * Use interrupt disable to serialize counter updates */ void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, int delta) { unsigned long flags; local_irq_save(flags); __mod_zone_page_state(zone, item, delta); local_irq_restore(flags); } EXPORT_SYMBOL(mod_zone_page_state); |
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void inc_zone_state(struct zone *zone, enum zone_stat_item item) { unsigned long flags; local_irq_save(flags); __inc_zone_state(zone, item); local_irq_restore(flags); } |
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void inc_zone_page_state(struct page *page, enum zone_stat_item item) { unsigned long flags; struct zone *zone; |
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zone = page_zone(page); local_irq_save(flags); |
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__inc_zone_state(zone, item); |
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local_irq_restore(flags); } EXPORT_SYMBOL(inc_zone_page_state); void dec_zone_page_state(struct page *page, enum zone_stat_item item) { unsigned long flags; |
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local_irq_save(flags); |
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__dec_zone_page_state(page, item); |
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local_irq_restore(flags); } EXPORT_SYMBOL(dec_zone_page_state); |
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#endif |
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/* * Update the zone counters for one cpu. |
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* |
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* The cpu specified must be either the current cpu or a processor that * is not online. If it is the current cpu then the execution thread must * be pinned to the current cpu. * |
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* Note that refresh_cpu_vm_stats strives to only access * node local memory. The per cpu pagesets on remote zones are placed * in the memory local to the processor using that pageset. So the * loop over all zones will access a series of cachelines local to * the processor. * * The call to zone_page_state_add updates the cachelines with the * statistics in the remote zone struct as well as the global cachelines * with the global counters. These could cause remote node cache line * bouncing and will have to be only done when necessary. |
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*/ void refresh_cpu_vm_stats(int cpu) { struct zone *zone; int i; |
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int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; |
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for_each_populated_zone(zone) { |
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struct per_cpu_pageset *p; |
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p = per_cpu_ptr(zone->pageset, cpu); |
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for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
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if (p->vm_stat_diff[i]) { |
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unsigned long flags; int v; |
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local_irq_save(flags); |
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v = p->vm_stat_diff[i]; |
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p->vm_stat_diff[i] = 0; |
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local_irq_restore(flags); atomic_long_add(v, &zone->vm_stat[i]); global_diff[i] += v; |
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#ifdef CONFIG_NUMA /* 3 seconds idle till flush */ p->expire = 3; #endif |
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} |
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cond_resched(); |
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#ifdef CONFIG_NUMA /* * Deal with draining the remote pageset of this * processor * * Check if there are pages remaining in this pageset * if not then there is nothing to expire. */ |
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if (!p->expire || !p->pcp.count) |
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continue; /* * We never drain zones local to this processor. */ if (zone_to_nid(zone) == numa_node_id()) { p->expire = 0; continue; } p->expire--; if (p->expire) continue; |
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if (p->pcp.count) drain_zone_pages(zone, &p->pcp); |
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#endif |
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} |
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for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) if (global_diff[i]) atomic_long_add(global_diff[i], &vm_stat[i]); |
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} |
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#endif |
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#ifdef CONFIG_NUMA /* * zonelist = the list of zones passed to the allocator * z = the zone from which the allocation occurred. * * Must be called with interrupts disabled. |
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* * When __GFP_OTHER_NODE is set assume the node of the preferred * zone is the local node. This is useful for daemons who allocate * memory on behalf of other processes. |
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*/ |
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void zone_statistics(struct zone *preferred_zone, struct zone *z, gfp_t flags) |
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{ |
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if (z->zone_pgdat == preferred_zone->zone_pgdat) { |
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__inc_zone_state(z, NUMA_HIT); } else { __inc_zone_state(z, NUMA_MISS); |
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__inc_zone_state(preferred_zone, NUMA_FOREIGN); |
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} |
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if (z->node == ((flags & __GFP_OTHER_NODE) ? preferred_zone->node : numa_node_id())) |
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__inc_zone_state(z, NUMA_LOCAL); else __inc_zone_state(z, NUMA_OTHER); } #endif |
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#ifdef CONFIG_COMPACTION |
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struct contig_page_info { unsigned long free_pages; unsigned long free_blocks_total; unsigned long free_blocks_suitable; }; /* * Calculate the number of free pages in a zone, how many contiguous * pages are free and how many are large enough to satisfy an allocation of * the target size. Note that this function makes no attempt to estimate * how many suitable free blocks there *might* be if MOVABLE pages were * migrated. Calculating that is possible, but expensive and can be * figured out from userspace */ static void fill_contig_page_info(struct zone *zone, unsigned int suitable_order, struct contig_page_info *info) { unsigned int order; info->free_pages = 0; info->free_blocks_total = 0; info->free_blocks_suitable = 0; for (order = 0; order < MAX_ORDER; order++) { unsigned long blocks; /* Count number of free blocks */ blocks = zone->free_area[order].nr_free; info->free_blocks_total += blocks; /* Count free base pages */ info->free_pages += blocks << order; /* Count the suitable free blocks */ if (order >= suitable_order) info->free_blocks_suitable += blocks << (order - suitable_order); } } |
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/* * A fragmentation index only makes sense if an allocation of a requested * size would fail. If that is true, the fragmentation index indicates * whether external fragmentation or a lack of memory was the problem. * The value can be used to determine if page reclaim or compaction * should be used */ |
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static int __fragmentation_index(unsigned int order, struct contig_page_info *info) |
f1a5ab121 mm: export fragme... |
557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 |
{ unsigned long requested = 1UL << order; if (!info->free_blocks_total) return 0; /* Fragmentation index only makes sense when a request would fail */ if (info->free_blocks_suitable) return -1000; /* * Index is between 0 and 1 so return within 3 decimal places * * 0 => allocation would fail due to lack of memory * 1 => allocation would fail due to fragmentation */ return 1000 - div_u64( (1000+(div_u64(info->free_pages * 1000ULL, requested))), info->free_blocks_total); } |
56de7263f mm: compaction: d... |
575 576 577 578 579 580 581 582 583 |
/* Same as __fragmentation index but allocs contig_page_info on stack */ int fragmentation_index(struct zone *zone, unsigned int order) { struct contig_page_info info; fill_contig_page_info(zone, order, &info); return __fragmentation_index(order, &info); } |
d7a5752c0 mm: export unusab... |
584 585 586 |
#endif #if defined(CONFIG_PROC_FS) || defined(CONFIG_COMPACTION) |
8f32f7e5a proc: move /proc/... |
587 |
#include <linux/proc_fs.h> |
f6ac2354d [PATCH] zoned vm ... |
588 |
#include <linux/seq_file.h> |
467c996c1 Print out statist... |
589 590 591 592 593 |
static char * const migratetype_names[MIGRATE_TYPES] = { "Unmovable", "Reclaimable", "Movable", "Reserve", |
91446b064 add "Isolate" mig... |
594 |
"Isolate", |
467c996c1 Print out statist... |
595 |
}; |
f6ac2354d [PATCH] zoned vm ... |
596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 |
static void *frag_start(struct seq_file *m, loff_t *pos) { pg_data_t *pgdat; loff_t node = *pos; for (pgdat = first_online_pgdat(); pgdat && node; pgdat = next_online_pgdat(pgdat)) --node; return pgdat; } static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) { pg_data_t *pgdat = (pg_data_t *)arg; (*pos)++; return next_online_pgdat(pgdat); } static void frag_stop(struct seq_file *m, void *arg) { } |
467c996c1 Print out statist... |
619 620 621 |
/* Walk all the zones in a node and print using a callback */ static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, void (*print)(struct seq_file *m, pg_data_t *, struct zone *)) |
f6ac2354d [PATCH] zoned vm ... |
622 |
{ |
f6ac2354d [PATCH] zoned vm ... |
623 624 625 |
struct zone *zone; struct zone *node_zones = pgdat->node_zones; unsigned long flags; |
f6ac2354d [PATCH] zoned vm ... |
626 627 628 629 630 631 |
for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { if (!populated_zone(zone)) continue; spin_lock_irqsave(&zone->lock, flags); |
467c996c1 Print out statist... |
632 |
print(m, pgdat, zone); |
f6ac2354d [PATCH] zoned vm ... |
633 |
spin_unlock_irqrestore(&zone->lock, flags); |
467c996c1 Print out statist... |
634 635 |
} } |
d7a5752c0 mm: export unusab... |
636 |
#endif |
467c996c1 Print out statist... |
637 |
|
0d6617c77 numa: fix NUMA co... |
638 |
#if defined(CONFIG_PROC_FS) || defined(CONFIG_SYSFS) || defined(CONFIG_NUMA) |
fa25c503d mm: per-node vmst... |
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 |
#ifdef CONFIG_ZONE_DMA #define TEXT_FOR_DMA(xx) xx "_dma", #else #define TEXT_FOR_DMA(xx) #endif #ifdef CONFIG_ZONE_DMA32 #define TEXT_FOR_DMA32(xx) xx "_dma32", #else #define TEXT_FOR_DMA32(xx) #endif #ifdef CONFIG_HIGHMEM #define TEXT_FOR_HIGHMEM(xx) xx "_high", #else #define TEXT_FOR_HIGHMEM(xx) #endif #define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \ TEXT_FOR_HIGHMEM(xx) xx "_movable", const char * const vmstat_text[] = { /* Zoned VM counters */ "nr_free_pages", "nr_inactive_anon", "nr_active_anon", "nr_inactive_file", "nr_active_file", "nr_unevictable", "nr_mlock", "nr_anon_pages", "nr_mapped", "nr_file_pages", "nr_dirty", "nr_writeback", "nr_slab_reclaimable", "nr_slab_unreclaimable", "nr_page_table_pages", "nr_kernel_stack", "nr_unstable", "nr_bounce", "nr_vmscan_write", "nr_writeback_temp", "nr_isolated_anon", "nr_isolated_file", "nr_shmem", "nr_dirtied", "nr_written", #ifdef CONFIG_NUMA "numa_hit", "numa_miss", "numa_foreign", "numa_interleave", "numa_local", "numa_other", #endif "nr_anon_transparent_hugepages", "nr_dirty_threshold", "nr_dirty_background_threshold", #ifdef CONFIG_VM_EVENT_COUNTERS "pgpgin", "pgpgout", "pswpin", "pswpout", TEXTS_FOR_ZONES("pgalloc") "pgfree", "pgactivate", "pgdeactivate", "pgfault", "pgmajfault", TEXTS_FOR_ZONES("pgrefill") TEXTS_FOR_ZONES("pgsteal") TEXTS_FOR_ZONES("pgscan_kswapd") TEXTS_FOR_ZONES("pgscan_direct") #ifdef CONFIG_NUMA "zone_reclaim_failed", #endif "pginodesteal", "slabs_scanned", "kswapd_steal", "kswapd_inodesteal", "kswapd_low_wmark_hit_quickly", "kswapd_high_wmark_hit_quickly", "kswapd_skip_congestion_wait", "pageoutrun", "allocstall", "pgrotated", #ifdef CONFIG_COMPACTION "compact_blocks_moved", "compact_pages_moved", "compact_pagemigrate_failed", "compact_stall", "compact_fail", "compact_success", #endif #ifdef CONFIG_HUGETLB_PAGE "htlb_buddy_alloc_success", "htlb_buddy_alloc_fail", #endif "unevictable_pgs_culled", "unevictable_pgs_scanned", "unevictable_pgs_rescued", "unevictable_pgs_mlocked", "unevictable_pgs_munlocked", "unevictable_pgs_cleared", "unevictable_pgs_stranded", "unevictable_pgs_mlockfreed", #ifdef CONFIG_TRANSPARENT_HUGEPAGE "thp_fault_alloc", "thp_fault_fallback", "thp_collapse_alloc", "thp_collapse_alloc_failed", "thp_split", #endif #endif /* CONFIG_VM_EVENTS_COUNTERS */ }; |
0d6617c77 numa: fix NUMA co... |
767 |
#endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA */ |
fa25c503d mm: per-node vmst... |
768 |
|
d7a5752c0 mm: export unusab... |
769 |
#ifdef CONFIG_PROC_FS |
467c996c1 Print out statist... |
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 |
static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, struct zone *zone) { int order; seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); for (order = 0; order < MAX_ORDER; ++order) seq_printf(m, "%6lu ", zone->free_area[order].nr_free); seq_putc(m, ' '); } /* * This walks the free areas for each zone. */ static int frag_show(struct seq_file *m, void *arg) { pg_data_t *pgdat = (pg_data_t *)arg; walk_zones_in_node(m, pgdat, frag_show_print); return 0; } static void pagetypeinfo_showfree_print(struct seq_file *m, pg_data_t *pgdat, struct zone *zone) { int order, mtype; for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) { seq_printf(m, "Node %4d, zone %8s, type %12s ", pgdat->node_id, zone->name, migratetype_names[mtype]); for (order = 0; order < MAX_ORDER; ++order) { unsigned long freecount = 0; struct free_area *area; struct list_head *curr; area = &(zone->free_area[order]); list_for_each(curr, &area->free_list[mtype]) freecount++; seq_printf(m, "%6lu ", freecount); } |
f6ac2354d [PATCH] zoned vm ... |
813 814 815 |
seq_putc(m, ' '); } |
467c996c1 Print out statist... |
816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 |
} /* Print out the free pages at each order for each migatetype */ static int pagetypeinfo_showfree(struct seq_file *m, void *arg) { int order; pg_data_t *pgdat = (pg_data_t *)arg; /* Print header */ seq_printf(m, "%-43s ", "Free pages count per migrate type at order"); for (order = 0; order < MAX_ORDER; ++order) seq_printf(m, "%6d ", order); seq_putc(m, ' '); walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print); return 0; } static void pagetypeinfo_showblockcount_print(struct seq_file *m, pg_data_t *pgdat, struct zone *zone) { int mtype; unsigned long pfn; unsigned long start_pfn = zone->zone_start_pfn; unsigned long end_pfn = start_pfn + zone->spanned_pages; unsigned long count[MIGRATE_TYPES] = { 0, }; for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { struct page *page; if (!pfn_valid(pfn)) continue; page = pfn_to_page(pfn); |
eb33575cf [ARM] Double chec... |
852 853 854 |
/* Watch for unexpected holes punched in the memmap */ if (!memmap_valid_within(pfn, page, zone)) |
e80d6a248 [ARM] Skip memory... |
855 |
continue; |
eb33575cf [ARM] Double chec... |
856 |
|
467c996c1 Print out statist... |
857 |
mtype = get_pageblock_migratetype(page); |
e80d6a248 [ARM] Skip memory... |
858 859 |
if (mtype < MIGRATE_TYPES) count[mtype]++; |
467c996c1 Print out statist... |
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 |
} /* Print counts */ seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) seq_printf(m, "%12lu ", count[mtype]); seq_putc(m, ' '); } /* Print out the free pages at each order for each migratetype */ static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg) { int mtype; pg_data_t *pgdat = (pg_data_t *)arg; seq_printf(m, " %-23s", "Number of blocks type "); for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) seq_printf(m, "%12s ", migratetype_names[mtype]); seq_putc(m, ' '); walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print); return 0; } /* * This prints out statistics in relation to grouping pages by mobility. * It is expensive to collect so do not constantly read the file. */ static int pagetypeinfo_show(struct seq_file *m, void *arg) { pg_data_t *pgdat = (pg_data_t *)arg; |
41b25a378 /proc/pagetypeinf... |
894 895 896 |
/* check memoryless node */ if (!node_state(pgdat->node_id, N_HIGH_MEMORY)) return 0; |
467c996c1 Print out statist... |
897 898 899 900 901 902 903 904 |
seq_printf(m, "Page block order: %d ", pageblock_order); seq_printf(m, "Pages per block: %lu ", pageblock_nr_pages); seq_putc(m, ' '); pagetypeinfo_showfree(m, pgdat); pagetypeinfo_showblockcount(m, pgdat); |
f6ac2354d [PATCH] zoned vm ... |
905 906 |
return 0; } |
8f32f7e5a proc: move /proc/... |
907 |
static const struct seq_operations fragmentation_op = { |
f6ac2354d [PATCH] zoned vm ... |
908 909 910 911 912 |
.start = frag_start, .next = frag_next, .stop = frag_stop, .show = frag_show, }; |
8f32f7e5a proc: move /proc/... |
913 914 915 916 917 918 919 920 921 922 923 |
static int fragmentation_open(struct inode *inode, struct file *file) { return seq_open(file, &fragmentation_op); } static const struct file_operations fragmentation_file_operations = { .open = fragmentation_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
74e2e8e8c proc: move /proc/... |
924 |
static const struct seq_operations pagetypeinfo_op = { |
467c996c1 Print out statist... |
925 926 927 928 929 |
.start = frag_start, .next = frag_next, .stop = frag_stop, .show = pagetypeinfo_show, }; |
74e2e8e8c proc: move /proc/... |
930 931 932 933 934 935 936 937 938 939 940 |
static int pagetypeinfo_open(struct inode *inode, struct file *file) { return seq_open(file, &pagetypeinfo_op); } static const struct file_operations pagetypeinfo_file_ops = { .open = pagetypeinfo_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
467c996c1 Print out statist... |
941 942 |
static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, struct zone *zone) |
f6ac2354d [PATCH] zoned vm ... |
943 |
{ |
467c996c1 Print out statist... |
944 945 946 947 948 949 950 951 952 953 954 |
int i; seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); seq_printf(m, " pages free %lu" " min %lu" " low %lu" " high %lu" |
08d9ae7cb vmscan: don't exp... |
955 956 |
" scanned %lu" |
467c996c1 Print out statist... |
957 958 959 960 |
" spanned %lu" " present %lu", |
88f5acf88 mm: page allocato... |
961 |
zone_page_state(zone, NR_FREE_PAGES), |
418589663 page allocator: u... |
962 963 964 |
min_wmark_pages(zone), low_wmark_pages(zone), high_wmark_pages(zone), |
467c996c1 Print out statist... |
965 |
zone->pages_scanned, |
467c996c1 Print out statist... |
966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 |
zone->spanned_pages, zone->present_pages); for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) seq_printf(m, " %-12s %lu", vmstat_text[i], zone_page_state(zone, i)); seq_printf(m, " protection: (%lu", zone->lowmem_reserve[0]); for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) seq_printf(m, ", %lu", zone->lowmem_reserve[i]); seq_printf(m, ")" " pagesets"); for_each_online_cpu(i) { struct per_cpu_pageset *pageset; |
467c996c1 Print out statist... |
986 |
|
99dcc3e5a this_cpu: Page al... |
987 |
pageset = per_cpu_ptr(zone->pageset, i); |
3dfa5721f Page allocator: g... |
988 989 990 991 992 993 994 995 996 997 998 999 1000 |
seq_printf(m, " cpu: %i" " count: %i" " high: %i" " batch: %i", i, pageset->pcp.count, pageset->pcp.high, pageset->pcp.batch); |
df9ecaba3 [PATCH] ZVC: Scal... |
1001 |
#ifdef CONFIG_SMP |
467c996c1 Print out statist... |
1002 1003 1004 |
seq_printf(m, " vm stats threshold: %d", pageset->stat_threshold); |
df9ecaba3 [PATCH] ZVC: Scal... |
1005 |
#endif |
f6ac2354d [PATCH] zoned vm ... |
1006 |
} |
467c996c1 Print out statist... |
1007 1008 1009 |
seq_printf(m, " all_unreclaimable: %u" |
556adecba vmscan: second ch... |
1010 1011 1012 1013 |
" start_pfn: %lu" " inactive_ratio: %u", |
93e4a89a8 mm: restore zone-... |
1014 |
zone->all_unreclaimable, |
556adecba vmscan: second ch... |
1015 1016 |
zone->zone_start_pfn, zone->inactive_ratio); |
467c996c1 Print out statist... |
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 |
seq_putc(m, ' '); } /* * Output information about zones in @pgdat. */ static int zoneinfo_show(struct seq_file *m, void *arg) { pg_data_t *pgdat = (pg_data_t *)arg; walk_zones_in_node(m, pgdat, zoneinfo_show_print); |
f6ac2354d [PATCH] zoned vm ... |
1028 1029 |
return 0; } |
5c9fe6281 proc: move /proc/... |
1030 |
static const struct seq_operations zoneinfo_op = { |
f6ac2354d [PATCH] zoned vm ... |
1031 1032 1033 1034 1035 1036 |
.start = frag_start, /* iterate over all zones. The same as in * fragmentation. */ .next = frag_next, .stop = frag_stop, .show = zoneinfo_show, }; |
5c9fe6281 proc: move /proc/... |
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 |
static int zoneinfo_open(struct inode *inode, struct file *file) { return seq_open(file, &zoneinfo_op); } static const struct file_operations proc_zoneinfo_file_operations = { .open = zoneinfo_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
79da826ae writeback: report... |
1048 1049 1050 1051 1052 |
enum writeback_stat_item { NR_DIRTY_THRESHOLD, NR_DIRTY_BG_THRESHOLD, NR_VM_WRITEBACK_STAT_ITEMS, }; |
f6ac2354d [PATCH] zoned vm ... |
1053 1054 |
static void *vmstat_start(struct seq_file *m, loff_t *pos) { |
2244b95a7 [PATCH] zoned vm ... |
1055 |
unsigned long *v; |
79da826ae writeback: report... |
1056 |
int i, stat_items_size; |
f6ac2354d [PATCH] zoned vm ... |
1057 1058 1059 |
if (*pos >= ARRAY_SIZE(vmstat_text)) return NULL; |
79da826ae writeback: report... |
1060 1061 |
stat_items_size = NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) + NR_VM_WRITEBACK_STAT_ITEMS * sizeof(unsigned long); |
f6ac2354d [PATCH] zoned vm ... |
1062 |
|
f8891e5e1 [PATCH] Light wei... |
1063 |
#ifdef CONFIG_VM_EVENT_COUNTERS |
79da826ae writeback: report... |
1064 |
stat_items_size += sizeof(struct vm_event_state); |
f8891e5e1 [PATCH] Light wei... |
1065 |
#endif |
79da826ae writeback: report... |
1066 1067 |
v = kmalloc(stat_items_size, GFP_KERNEL); |
2244b95a7 [PATCH] zoned vm ... |
1068 1069 |
m->private = v; if (!v) |
f6ac2354d [PATCH] zoned vm ... |
1070 |
return ERR_PTR(-ENOMEM); |
2244b95a7 [PATCH] zoned vm ... |
1071 1072 |
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) v[i] = global_page_state(i); |
79da826ae writeback: report... |
1073 1074 1075 1076 1077 |
v += NR_VM_ZONE_STAT_ITEMS; global_dirty_limits(v + NR_DIRTY_BG_THRESHOLD, v + NR_DIRTY_THRESHOLD); v += NR_VM_WRITEBACK_STAT_ITEMS; |
f8891e5e1 [PATCH] Light wei... |
1078 |
#ifdef CONFIG_VM_EVENT_COUNTERS |
79da826ae writeback: report... |
1079 1080 1081 |
all_vm_events(v); v[PGPGIN] /= 2; /* sectors -> kbytes */ v[PGPGOUT] /= 2; |
f8891e5e1 [PATCH] Light wei... |
1082 |
#endif |
ff8b16d7e vmstat: fix offse... |
1083 |
return (unsigned long *)m->private + *pos; |
f6ac2354d [PATCH] zoned vm ... |
1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 |
} static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) { (*pos)++; if (*pos >= ARRAY_SIZE(vmstat_text)) return NULL; return (unsigned long *)m->private + *pos; } static int vmstat_show(struct seq_file *m, void *arg) { unsigned long *l = arg; unsigned long off = l - (unsigned long *)m->private; seq_printf(m, "%s %lu ", vmstat_text[off], *l); return 0; } static void vmstat_stop(struct seq_file *m, void *arg) { kfree(m->private); m->private = NULL; } |
b6aa44ab6 proc: move /proc/... |
1109 |
static const struct seq_operations vmstat_op = { |
f6ac2354d [PATCH] zoned vm ... |
1110 1111 1112 1113 1114 |
.start = vmstat_start, .next = vmstat_next, .stop = vmstat_stop, .show = vmstat_show, }; |
b6aa44ab6 proc: move /proc/... |
1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 |
static int vmstat_open(struct inode *inode, struct file *file) { return seq_open(file, &vmstat_op); } static const struct file_operations proc_vmstat_file_operations = { .open = vmstat_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
f6ac2354d [PATCH] zoned vm ... |
1126 |
#endif /* CONFIG_PROC_FS */ |
df9ecaba3 [PATCH] ZVC: Scal... |
1127 |
#ifdef CONFIG_SMP |
d1187ed21 vmstat: use our o... |
1128 |
static DEFINE_PER_CPU(struct delayed_work, vmstat_work); |
77461ab33 Make vm statistic... |
1129 |
int sysctl_stat_interval __read_mostly = HZ; |
d1187ed21 vmstat: use our o... |
1130 1131 1132 1133 |
static void vmstat_update(struct work_struct *w) { refresh_cpu_vm_stats(smp_processor_id()); |
77461ab33 Make vm statistic... |
1134 |
schedule_delayed_work(&__get_cpu_var(vmstat_work), |
98f4ebb29 mm: align vmstat_... |
1135 |
round_jiffies_relative(sysctl_stat_interval)); |
d1187ed21 vmstat: use our o... |
1136 |
} |
42614fcde vmstat: fix secti... |
1137 |
static void __cpuinit start_cpu_timer(int cpu) |
d1187ed21 vmstat: use our o... |
1138 |
{ |
1871e52c7 percpu: make perc... |
1139 |
struct delayed_work *work = &per_cpu(vmstat_work, cpu); |
d1187ed21 vmstat: use our o... |
1140 |
|
1871e52c7 percpu: make perc... |
1141 1142 |
INIT_DELAYED_WORK_DEFERRABLE(work, vmstat_update); schedule_delayed_work_on(cpu, work, __round_jiffies_relative(HZ, cpu)); |
d1187ed21 vmstat: use our o... |
1143 |
} |
df9ecaba3 [PATCH] ZVC: Scal... |
1144 1145 1146 1147 1148 1149 1150 1151 |
/* * Use the cpu notifier to insure that the thresholds are recalculated * when necessary. */ static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { |
d1187ed21 vmstat: use our o... |
1152 |
long cpu = (long)hcpu; |
df9ecaba3 [PATCH] ZVC: Scal... |
1153 |
switch (action) { |
d1187ed21 vmstat: use our o... |
1154 1155 |
case CPU_ONLINE: case CPU_ONLINE_FROZEN: |
5ee28a447 vmstat: update zo... |
1156 |
refresh_zone_stat_thresholds(); |
d1187ed21 vmstat: use our o... |
1157 |
start_cpu_timer(cpu); |
ad596925e this_cpu: Remove ... |
1158 |
node_set_state(cpu_to_node(cpu), N_CPU); |
d1187ed21 vmstat: use our o... |
1159 1160 1161 |
break; case CPU_DOWN_PREPARE: case CPU_DOWN_PREPARE_FROZEN: |
afe2c511f workqueue: conver... |
1162 |
cancel_delayed_work_sync(&per_cpu(vmstat_work, cpu)); |
d1187ed21 vmstat: use our o... |
1163 1164 1165 1166 1167 1168 |
per_cpu(vmstat_work, cpu).work.func = NULL; break; case CPU_DOWN_FAILED: case CPU_DOWN_FAILED_FROZEN: start_cpu_timer(cpu); break; |
ce421c799 [PATCH] mm: clean... |
1169 |
case CPU_DEAD: |
8bb784428 Add suspend-relat... |
1170 |
case CPU_DEAD_FROZEN: |
ce421c799 [PATCH] mm: clean... |
1171 1172 1173 1174 |
refresh_zone_stat_thresholds(); break; default: break; |
df9ecaba3 [PATCH] ZVC: Scal... |
1175 1176 1177 1178 1179 1180 |
} return NOTIFY_OK; } static struct notifier_block __cpuinitdata vmstat_notifier = { &vmstat_cpuup_callback, NULL, 0 }; |
8f32f7e5a proc: move /proc/... |
1181 |
#endif |
df9ecaba3 [PATCH] ZVC: Scal... |
1182 |
|
e2fc88d06 mm/vmstat.c: clea... |
1183 |
static int __init setup_vmstat(void) |
df9ecaba3 [PATCH] ZVC: Scal... |
1184 |
{ |
8f32f7e5a proc: move /proc/... |
1185 |
#ifdef CONFIG_SMP |
d1187ed21 vmstat: use our o... |
1186 |
int cpu; |
df9ecaba3 [PATCH] ZVC: Scal... |
1187 |
register_cpu_notifier(&vmstat_notifier); |
d1187ed21 vmstat: use our o... |
1188 1189 1190 |
for_each_online_cpu(cpu) start_cpu_timer(cpu); |
8f32f7e5a proc: move /proc/... |
1191 1192 1193 |
#endif #ifdef CONFIG_PROC_FS proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations); |
74e2e8e8c proc: move /proc/... |
1194 |
proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops); |
b6aa44ab6 proc: move /proc/... |
1195 |
proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations); |
5c9fe6281 proc: move /proc/... |
1196 |
proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations); |
8f32f7e5a proc: move /proc/... |
1197 |
#endif |
df9ecaba3 [PATCH] ZVC: Scal... |
1198 1199 1200 |
return 0; } module_init(setup_vmstat) |
d7a5752c0 mm: export unusab... |
1201 1202 1203 1204 1205 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 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 |
#if defined(CONFIG_DEBUG_FS) && defined(CONFIG_COMPACTION) #include <linux/debugfs.h> static struct dentry *extfrag_debug_root; /* * Return an index indicating how much of the available free memory is * unusable for an allocation of the requested size. */ static int unusable_free_index(unsigned int order, struct contig_page_info *info) { /* No free memory is interpreted as all free memory is unusable */ if (info->free_pages == 0) return 1000; /* * Index should be a value between 0 and 1. Return a value to 3 * decimal places. * * 0 => no fragmentation * 1 => high fragmentation */ return div_u64((info->free_pages - (info->free_blocks_suitable << order)) * 1000ULL, info->free_pages); } static void unusable_show_print(struct seq_file *m, pg_data_t *pgdat, struct zone *zone) { unsigned int order; int index; struct contig_page_info info; seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); for (order = 0; order < MAX_ORDER; ++order) { fill_contig_page_info(zone, order, &info); index = unusable_free_index(order, &info); seq_printf(m, "%d.%03d ", index / 1000, index % 1000); } seq_putc(m, ' '); } /* * Display unusable free space index * * The unusable free space index measures how much of the available free * memory cannot be used to satisfy an allocation of a given size and is a * value between 0 and 1. The higher the value, the more of free memory is * unusable and by implication, the worse the external fragmentation is. This * can be expressed as a percentage by multiplying by 100. */ static int unusable_show(struct seq_file *m, void *arg) { pg_data_t *pgdat = (pg_data_t *)arg; /* check memoryless node */ if (!node_state(pgdat->node_id, N_HIGH_MEMORY)) return 0; walk_zones_in_node(m, pgdat, unusable_show_print); return 0; } static const struct seq_operations unusable_op = { .start = frag_start, .next = frag_next, .stop = frag_stop, .show = unusable_show, }; static int unusable_open(struct inode *inode, struct file *file) { return seq_open(file, &unusable_op); } static const struct file_operations unusable_file_ops = { .open = unusable_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
f1a5ab121 mm: export fragme... |
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 |
static void extfrag_show_print(struct seq_file *m, pg_data_t *pgdat, struct zone *zone) { unsigned int order; int index; /* Alloc on stack as interrupts are disabled for zone walk */ struct contig_page_info info; seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); for (order = 0; order < MAX_ORDER; ++order) { fill_contig_page_info(zone, order, &info); |
56de7263f mm: compaction: d... |
1303 |
index = __fragmentation_index(order, &info); |
f1a5ab121 mm: export fragme... |
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 |
seq_printf(m, "%d.%03d ", index / 1000, index % 1000); } seq_putc(m, ' '); } /* * Display fragmentation index for orders that allocations would fail for */ static int extfrag_show(struct seq_file *m, void *arg) { pg_data_t *pgdat = (pg_data_t *)arg; walk_zones_in_node(m, pgdat, extfrag_show_print); return 0; } static const struct seq_operations extfrag_op = { .start = frag_start, .next = frag_next, .stop = frag_stop, .show = extfrag_show, }; static int extfrag_open(struct inode *inode, struct file *file) { return seq_open(file, &extfrag_op); } static const struct file_operations extfrag_file_ops = { .open = extfrag_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
d7a5752c0 mm: export unusab... |
1341 1342 1343 1344 1345 1346 1347 1348 1349 |
static int __init extfrag_debug_init(void) { extfrag_debug_root = debugfs_create_dir("extfrag", NULL); if (!extfrag_debug_root) return -ENOMEM; if (!debugfs_create_file("unusable_index", 0444, extfrag_debug_root, NULL, &unusable_file_ops)) return -ENOMEM; |
f1a5ab121 mm: export fragme... |
1350 1351 1352 |
if (!debugfs_create_file("extfrag_index", 0444, extfrag_debug_root, NULL, &extfrag_file_ops)) return -ENOMEM; |
d7a5752c0 mm: export unusab... |
1353 1354 1355 1356 1357 |
return 0; } module_init(extfrag_debug_init); #endif |