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| author | Mel Gorman <mgorman@suse.de> | 2012-07-31 16:44:39 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-31 18:42:46 -0700 |
| commit | 68243e76ee343d63c6cf76978588a885951e2818 (patch) | |
| tree | e6ec975265272c81e03312e1ebc1c27fd6fdfa19 /include/linux | |
| parent | 5515061d22f0f9976ae7815864bfd22042d36848 (diff) | |
| download | linux-stable-68243e76ee343d63c6cf76978588a885951e2818.tar.gz linux-stable-68243e76ee343d63c6cf76978588a885951e2818.tar.bz2 linux-stable-68243e76ee343d63c6cf76978588a885951e2818.zip | |
mm: account for the number of times direct reclaimers get throttled
Under significant pressure when writing back to network-backed storage,
direct reclaimers may get throttled. This is expected to be a short-lived
event and the processes get woken up again but processes do get stalled.
This patch counts how many times such stalling occurs. It's up to the
administrator whether to reduce these stalls by increasing
min_free_kbytes.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Cc: David Miller <davem@davemloft.net>
Cc: Neil Brown <neilb@suse.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Christie <michaelc@cs.wisc.edu>
Cc: Eric B Munson <emunson@mgebm.net>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/vm_event_item.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h index 06f8e3858251..57f7b1091511 100644 --- a/include/linux/vm_event_item.h +++ b/include/linux/vm_event_item.h @@ -30,6 +30,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, FOR_ALL_ZONES(PGSTEAL_DIRECT), FOR_ALL_ZONES(PGSCAN_KSWAPD), FOR_ALL_ZONES(PGSCAN_DIRECT), + PGSCAN_DIRECT_THROTTLE, #ifdef CONFIG_NUMA PGSCAN_ZONE_RECLAIM_FAILED, #endif |