]> 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>
Tue, 28 Mar 2023 23:25:06 +0000 (16:25 -0700)
commit7df744bba902011de4877828b31347f034f0315a
tree37c4b389a6d41a4dfebf121ab8705984ac5e2db7
parentdc0d6aa82bdf8c5f61e3cdde7b6dcd61164600ed
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>
Cc: 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