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author | Ingo Molnar <mingo@elte.hu> | 2011-03-08 17:21:49 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2011-03-08 17:21:52 +0100 |
commit | 86cb2ec7b22a0a89b8660110dc03321fadbef45f (patch) | |
tree | c4162b0ab7c4e3602e2b7a6a6fd47c55c3315fea /mm/vmscan.c | |
parent | 7f0030b211579939461468f25b80c73e293c46e0 (diff) | |
parent | a5abba989deceb731047425812d268daf7536575 (diff) | |
download | talos-op-linux-86cb2ec7b22a0a89b8660110dc03321fadbef45f.tar.gz talos-op-linux-86cb2ec7b22a0a89b8660110dc03321fadbef45f.zip |
Merge commit 'v2.6.38-rc8' into perf/core
Merge reason: Merge latest fixes.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r-- | mm/vmscan.c | 32 |
1 files changed, 22 insertions, 10 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 17497d0cd8b9..6771ea70bfe7 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1841,16 +1841,28 @@ static inline bool should_continue_reclaim(struct zone *zone, if (!(sc->reclaim_mode & RECLAIM_MODE_COMPACTION)) return false; - /* - * If we failed to reclaim and have scanned the full list, stop. - * NOTE: Checking just nr_reclaimed would exit reclaim/compaction far - * faster but obviously would be less likely to succeed - * allocation. If this is desirable, use GFP_REPEAT to decide - * if both reclaimed and scanned should be checked or just - * reclaimed - */ - if (!nr_reclaimed && !nr_scanned) - return false; + /* Consider stopping depending on scan and reclaim activity */ + if (sc->gfp_mask & __GFP_REPEAT) { + /* + * For __GFP_REPEAT allocations, stop reclaiming if the + * full LRU list has been scanned and we are still failing + * to reclaim pages. This full LRU scan is potentially + * expensive but a __GFP_REPEAT caller really wants to succeed + */ + if (!nr_reclaimed && !nr_scanned) + return false; + } else { + /* + * For non-__GFP_REPEAT allocations which can presumably + * fail without consequence, stop if we failed to reclaim + * any pages from the last SWAP_CLUSTER_MAX number of + * pages that were scanned. This will return to the + * caller faster at the risk reclaim/compaction and + * the resulting allocation attempt fails + */ + if (!nr_reclaimed) + return false; + } /* * If we have not reclaimed enough pages for compaction and the |