The patch titled
Subject: mm: compaction: drop redundant watermark check in compaction_zonelist_suitable()
has been added to the -mm mm-unstable branch. Its filename is
mm-compaction-drop-redundant-watermark-check-in-compaction_zonelist_suitable.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-compaction-drop-redundant-watermark-check-in-compaction_zonelist_suitable.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: compaction: drop redundant watermark check in compaction_zonelist_suitable()
Date: Fri, 19 May 2023 14:39:59 +0200
The watermark check in compaction_zonelist_suitable(), called from
should_compact_retry(), is sandwiched between two watermark checks
already: before, there are freelist attempts as part of direct reclaim and
direct compaction; after, there is a last-minute freelist attempt in
__alloc_pages_may_oom().
The check in compaction_zonelist_suitable() isn't necessary. Kill it.
Link: https://lkml.kernel.org/r/20230519123959.77335-6-hannes@xxxxxxxxxxx
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 7 -------
1 file changed, 7 deletions(-)
--- a/mm/compaction.c~mm-compaction-drop-redundant-watermark-check-in-compaction_zonelist_suitable
+++ a/mm/compaction.c
@@ -2301,13 +2301,6 @@ bool compaction_zonelist_suitable(struct
for_each_zone_zonelist_nodemask(zone, z, ac->zonelist,
ac->highest_zoneidx, ac->nodemask) {
unsigned long available;
- unsigned long watermark;
-
- /* Allocation can already succeed, nothing to do */
- watermark = wmark_pages(zone, alloc_flags & ALLOC_WMARK_MASK);
- if (zone_watermark_ok(zone, order, watermark,
- ac->highest_zoneidx, alloc_flags))
- continue;
/*
* Do not consider all the reclaimable memory because we do not
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
mm-compaction-remove-compaction-result-helpers.patch
mm-compaction-simplify-should_compact_retry.patch
mm-compaction-refactor-__compaction_suitable.patch
mm-compaction-remove-unnecessary-is_via_compact_memory-checks.patch
mm-compaction-drop-redundant-watermark-check-in-compaction_zonelist_suitable.patch
