]> www.infradead.org Git - users/jedix/linux-maple.git/commit
mm: compaction: consider the number of scanning compound pages in isolate fail path
authorBaolin Wang <baolin.wang@linux.alibaba.com>
Thu, 16 Mar 2023 11:06:46 +0000 (19:06 +0800)
committerAndrew Morton <akpm@linux-foundation.org>
Wed, 5 Apr 2023 23:02:28 +0000 (16:02 -0700)
commit1591be12133b85b7f655027ef83c49bea0b5171b
tree74e4448ee866f317a567ac5482f0315bd775e0f6
parent7b3987c82d3fd3735936d94805b9c15d6bb68a58
mm: compaction: consider the number of scanning compound pages in isolate fail path

commit b717d6b93b54 ("mm: compaction: include compound page count for
scanning in pageblock isolation") added compound page statistics for
scanning in pageblock isolation, to make sure the number of scanned pages
is always larger than the number of isolated pages when isolating
mirgratable or free pageblock.

However, when failing to isolate the pages when scanning the migratable or
free pageblocks, the isolation failure path did not consider the scanning
statistics of the compound pages, which result in showing the incorrect
number of scanned pages in tracepoints or in vmstats which will confuse
people about the page scanning pressure in memory compaction.

Thus we should take into account the number of scanning pages when failing
to isolate the compound pages to make the statistics accurate.

Link: https://lkml.kernel.org/r/73d6250a90707649cc010731aedc27f946d722ed.1678962352.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: William Lam <william.lam@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
mm/compaction.c