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author | Vlastimil Babka <vbabka@suse.cz> | 2013-09-11 14:22:32 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-11 15:58:00 -0700 |
commit | 56afe477df3cbbcd656682d0355ef7d9eb8bdd81 (patch) | |
tree | 8955c59c624d0790da97f44fad3ce5a45dbad76d /fs/libfs.c | |
parent | 1ebb7cc6a58321a4b22c4c9097b4651b0ab859d0 (diff) | |
download | talos-obmc-linux-56afe477df3cbbcd656682d0355ef7d9eb8bdd81.tar.gz talos-obmc-linux-56afe477df3cbbcd656682d0355ef7d9eb8bdd81.zip |
mm: munlock: bypass per-cpu pvec for putback_lru_page
After introducing batching by pagevecs into munlock_vma_range(), we can
further improve performance by bypassing the copying into per-cpu pagevec
and the get_page/put_page pair associated with that. Instead we perform
LRU putback directly from our pagevec. However, this is possible only for
single-mapped pages that are evictable after munlock. Unevictable pages
require rechecking after putting on the unevictable list, so for those we
fallback to putback_lru_page(), hich handles that.
After this patch, a 13% speedup was measured for munlocking a 56GB large
memory area with THP disabled.
[akpm@linux-foundation.org:clarify comment]
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Jörn Engel <joern@logfs.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Michel Lespinasse <walken@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/libfs.c')
0 files changed, 0 insertions, 0 deletions