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authorDavid Rientjes <rientjes@google.com>2017-11-17 15:26:27 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-17 16:10:00 -0800
commita0647dc9208fae9124ca38d43a5c3c950d955291 (patch)
treedcdcdbdc23112f8733e506b087f47f637fdbdd48 /mm
parent09af5ccea26d347041ac7ca37a61f859ef9bd1f5 (diff)
download96b-common-a0647dc9208fae9124ca38d43a5c3c950d955291.tar.gz
mm, compaction: kcompactd should not ignore pageblock skip
Kcompactd is needlessly ignoring pageblock skip information. It is doing MIGRATE_SYNC_LIGHT compaction, which is no more powerful than MIGRATE_SYNC compaction. If compaction recently failed to isolate memory from a set of pageblocks, there is nothing to indicate that kcompactd will be able to do so, or that it is beneficial from attempting to isolate memory. Use the pageblock skip hint to avoid rescanning pageblocks needlessly until that information is reset. Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1708151638550.106658@chino.kir.corp.google.com Signed-off-by: David Rientjes <rientjes@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/compaction.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index 85395dc6eb13..ad40d67421f3 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1928,9 +1928,8 @@ static void kcompactd_do_work(pg_data_t *pgdat)
.total_free_scanned = 0,
.classzone_idx = pgdat->kcompactd_classzone_idx,
.mode = MIGRATE_SYNC_LIGHT,
- .ignore_skip_hint = true,
+ .ignore_skip_hint = false,
.gfp_mask = GFP_KERNEL,
-
};
trace_mm_compaction_kcompactd_wake(pgdat->node_id, cc.order,
cc.classzone_idx);