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mm, migrate: count pages failing all retries in vmstat and tracepoint 

Migration tries up to 10 times to migrate pages that return -EAGAIN until
it gives up.  If some pages fail all retries, they are counted towards the
number of failed pages that migrate_pages() returns.  They should also be
counted in the /proc/vmstat pgmigrate_fail and in the mm_migrate_pages
tracepoint.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vlastimil Babka 2015-11-05 18:47:03 -08:00 committed by Linus Torvalds
parent 35bd16a227
commit f2f81fb2b7
1 changed files with 2 additions and 1 deletions
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3
mm/migrate.c
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@ -1169,7 +1169,8 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
} }
} }
} }
rc = nr_failed + retry; nr_failed += retry;
rc = nr_failed;
out: out:
if (nr_succeeded) if (nr_succeeded)
count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded); count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded);