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| author | Andy Voltz <andy.voltz@timesys.com> | 2010-11-15 16:00:38 -0500 |
|---|---|---|
| committer | Andy Voltz <andy.voltz@timesys.com> | 2010-11-17 11:30:34 -0500 |
| commit | 2e0ae4bf137e282e825b27b02eb46f86c59d004e (patch) | |
| tree | 7c2534acd757ca414f02c5b983ee67eb2b2493c6 /mm/mmzone.c | |
| parent | 22763c5cf3690a681551162c15d34d935308c8d7 (diff) | |
Bump Linux kernel to 2.6.32.25
Diffstat (limited to 'mm/mmzone.c')
| -rw-r--r-- | mm/mmzone.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/mm/mmzone.c b/mm/mmzone.c index f5b7d1760213..e35bfb82c855 100644 --- a/mm/mmzone.c +++ b/mm/mmzone.c @@ -87,3 +87,24 @@ int memmap_valid_within(unsigned long pfn, return 1; } #endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */ + +#ifdef CONFIG_SMP +/* Called when a more accurate view of NR_FREE_PAGES is needed */ +unsigned long zone_nr_free_pages(struct zone *zone) +{ + unsigned long nr_free_pages = zone_page_state(zone, NR_FREE_PAGES); + + /* + * While kswapd is awake, it is considered the zone is under some + * memory pressure. Under pressure, there is a risk that + * per-cpu-counter-drift will allow the min watermark to be breached + * potentially causing a live-lock. While kswapd is awake and + * free pages are low, get a better estimate for free pages + */ + if (nr_free_pages < zone->percpu_drift_mark && + !waitqueue_active(&zone->zone_pgdat->kswapd_wait)) + return zone_page_state_snapshot(zone, NR_FREE_PAGES); + + return nr_free_pages; +} +#endif /* CONFIG_SMP */ |