Commit 860b3272 authored by Alex Shi's avatar Alex Shi Committed by Linus Torvalds
Browse files

mm/compaction: correct the comments of compact_defer_shift 



There is no compact_defer_limit. It should be compact_defer_shift in
use. and add compact_order_failed explanation.

Signed-off-by: default avatarAlex Shi <alex.shi@linux.alibaba.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarAlexander Duyck <alexander.h.duyck@linux.intel.com>
Link: http://lkml.kernel.org/r/3bd60e1b-a74e-050d-ade4-6e8f54e00b92@linux.alibaba.com


Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d34c0a75

include/linux/mmzone.h

+1 −0
Original line number Diff line number Diff line
@@ -536,6 +536,7 @@ struct zone { 
	 * On compaction failure, 1<<compact_defer_shift compactions

	 * are skipped before trying again. The number attempted since

	 * last failure is tracked with compact_considered.

	 * compact_order_failed is the minimum compaction failed order.

	 */

	unsigned int		compact_considered;

	unsigned int		compact_defer_shift;

mm/compaction.c

+1 −1
Original line number Diff line number Diff line
@@ -154,7 +154,7 @@ EXPORT_SYMBOL(__ClearPageMovable); 


/*

 * Compaction is deferred when compaction fails to result in a page

 * allocation success. 1 << compact_defer_limit compactions are skipped up

 * allocation success. 1 << compact_defer_shift, compactions are skipped up

 * to a limit of 1 << COMPACT_MAX_DEFER_SHIFT

 */

void defer_compaction(struct zone *zone, int order)