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Merge "mm: page-writeback: fix page state calculation in throttle_vm_writeout"

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Linux Build Service Account 2015-04-13 23:19:05 -07:00 committed by Gerrit - the friendly Code Review server
commit 141207c633
2 changed files with 25 additions and 0 deletions
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19
include/linux/vmstat.h
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@ -142,6 +142,25 @@ static inline unsigned long zone_page_state_snapshot(struct zone *zone,
return x;
}
static inline unsigned long global_page_state_snapshot(enum zone_stat_item item)
{
long x = atomic_long_read(&vm_stat[item]);
#ifdef CONFIG_SMP
struct zone *zone;
int cpu;
for_each_online_cpu(cpu) {
for_each_populated_zone(zone)
x += per_cpu_ptr(zone->pageset,
cpu)->vm_stat_diff[item];
}
if (x < 0)
x = 0;
#endif
return x;
}
#ifdef CONFIG_NUMA
/*
* Determine the per node value of a stat item. This function

6
mm/page-writeback.c
View file

@ -1670,6 +1670,12 @@ void throttle_vm_writeout(gfp_t gfp_mask)
if (global_page_state(NR_UNSTABLE_NFS) +
global_page_state(NR_WRITEBACK) <= dirty_thresh)
break;
/* Try safe version */
else if (unlikely(global_page_state_snapshot(NR_UNSTABLE_NFS) +
global_page_state_snapshot(NR_WRITEBACK) <=
dirty_thresh))
break;
congestion_wait(BLK_RW_ASYNC, HZ/10);
/*