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migrate_pages_batch: fix statistics for longterm pin retry

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In commit fd4a7ac329 ("mm: migrate: try again if THP split is failed due
to page refcnt"), if the THP splitting fails due to page reference count,
we will retry to improve migration successful rate.  But the failed
splitting is counted as migration failure and migration retry, which will
cause duplicated failure counting.  So, in this patch, this is fixed via
undoing the failure counting if we decide to retry.  The patch is tested
via failure injection.

Link: https://lkml.kernel.org/r/20230416235929.1040194-1-ying.huang@intel.com
Fixes: fd4a7ac329 ("mm: migrate: try again if THP split is failed due to page refcnt")
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Huang Ying 2023-04-17 07:59:29 +08:00 committed by Andrew Morton
parent 686ea6e61d
commit 851ae64246
1 changed files with 3 additions and 0 deletions
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3
mm/migrate.c
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@ -1710,6 +1710,9 @@ static int migrate_pages_batch(struct list_head *from, new_page_t get_new_page,
large_retry++;
thp_retry += is_thp;
nr_retry_pages += nr_pages;
/* Undo duplicated failure counting. */
nr_large_failed--;
stats->nr_thp_failed -= is_thp;
break;
}
}