The patch titled
Subject: mm/compaction: stop isolation if too many pages are isolated and we have pages to migrate
has been added to the -mm tree. Its filename is
mm-compaction-stop-isolation-if-too-many-pages-are-isolated-and-we-have-pages-to-migrate.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-compaction-stop-isolation-if-too-many-pages-are-isolated-and-we-have-pages-to-migrate.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-compaction-stop-isolation-if-too-many-pages-are-isolated-and-we-have-pages-to-migrate.patch
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------------------------------------------------------
From: Zi Yan <ziy@xxxxxxxxxx>
Subject: mm/compaction: stop isolation if too many pages are isolated and we have pages to migrate
In isolate_migratepages_block, if we have too many isolated pages and
nr_migratepages is not zero, we should try to migrate what we have without
wasting time on isolating.
Link: https://lkml.kernel.org/r/20201030183809.3616803-2-zi.yan@xxxxxxxx
Fixes: 1da2f328fa64 (“mm,thp,compaction,cma: allow THP migration for CMA allocations”)
Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
Suggested-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/mm/compaction.c~mm-compaction-stop-isolation-if-too-many-pages-are-isolated-and-we-have-pages-to-migrate
+++ a/mm/compaction.c
@@ -817,6 +817,10 @@ isolate_migratepages_block(struct compac
* delay for some time until fewer pages are isolated
*/
while (unlikely(too_many_isolated(pgdat))) {
+ /* stop isolation if there are still pages not migrated */
+ if (cc->nr_migratepages)
+ return 0;
+
/* async migration should just abort */
if (cc->mode == MIGRATE_ASYNC)
return 0;
_
Patches currently in -mm which might be from ziy@xxxxxxxxxx are
mm-compaction-count-pages-and-stop-correctly-during-page-isolation.patch
mm-compaction-count-pages-and-stop-correctly-during-page-isolation-v3.patch
mm-compaction-stop-isolation-if-too-many-pages-are-isolated-and-we-have-pages-to-migrate.patch
