Commit 62b35fe0 authored by Mateusz Nosek's avatar Mateusz Nosek Committed by Linus Torvalds
Browse files

mm/compaction.c: micro-optimization remove unnecessary branch 



The same code can work both for 'zone->compact_considered > defer_limit'
and 'zone->compact_considered >= defer_limit'.  In the latter there is one
branch less which is more effective considering performance.

Signed-off-by: default avatarMateusz Nosek <mateusznosek0@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>
Cc: David Rientjes <rientjes@google.com>
Link: https://lkml.kernel.org/r/20200913190448.28649-1-mateusznosek0@gmail.com


Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 18601294

mm/compaction.c

+2 −3
Original line number Diff line number Diff line
@@ -180,11 +180,10 @@ bool compaction_deferred(struct zone *zone, int order) 
		return false;



	/* Avoid possible overflow */

	if (++zone->compact_considered > defer_limit)

	if (++zone->compact_considered >= defer_limit) {

		zone->compact_considered = defer_limit;



	if (zone->compact_considered >= defer_limit)

		return false;

	}



	trace_mm_compaction_deferred(zone, order);