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migrate_pages(): fix failure counting for THP subpages retrying 

If THP is failed to be migrated for -ENOSYS and -ENOMEM, the THP will be
split into thp_split_pages, and after other pages are migrated, pages in
thp_split_pages will be migrated with no_subpage_counting == true, because
its failure have been counted already.  If some pages in thp_split_pages
are retried during migration, we should not count their failure if
no_subpage_counting == true too.  This is done this patch to fix the
failure counting for THP subpages retrying.

Link: https://lkml.kernel.org/r/20220817081408.513338-5-ying.huang@intel.com
Fixes: 5984fabb6e ("mm: move_pages: report the number of non-attempted pages")
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Huang Ying 2022-08-17 16:14:04 +08:00 committed by Andrew Morton
parent fbed53b477
commit 5fc30916b5
1 changed files with 2 additions and 1 deletions
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3
mm/migrate.c
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@ -1545,7 +1545,8 @@ retry:
}
}
}
nr_failed += retry;
if (!no_subpage_counting)
nr_failed += retry;
nr_thp_failed += thp_retry;
/*
* Try to migrate subpages of fail-to-migrate THPs, no nr_failed