The patch titled
Subject: mm: memcg: only evict file pages when we have plenty
has been added to the -mm tree. Its filename is
mm-memcg-only-evict-file-pages-when-we-have-plenty.patch
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: memcg: only evict file pages when we have plenty
e986850 ("mm, vmscan: only evict file pages when we have plenty") makes a
point of not going for anonymous memory while there is still enough
inactive cache around.
The check was added only for global reclaim, but it is just as useful to
reduce swapping in memory cgroup reclaim:
200M-memcg-defconfig-j2
vanilla patched
Real time 454.06 ( +0.00%) 453.71 ( -0.08%)
User time 668.57 ( +0.00%) 668.73 ( +0.02%)
System time 128.92 ( +0.00%) 129.53 ( +0.46%)
Swap in 1246.80 ( +0.00%) 814.40 ( -34.65%)
Swap out 1198.90 ( +0.00%) 827.00 ( -30.99%)
Pages allocated 16431288.10 ( +0.00%) 16434035.30 ( +0.02%)
Major faults 681.50 ( +0.00%) 593.70 ( -12.86%)
THP faults 237.20 ( +0.00%) 242.40 ( +2.18%)
THP collapse 241.20 ( +0.00%) 248.50 ( +3.01%)
THP splits 157.30 ( +0.00%) 161.40 ( +2.59%)
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
Acked-by: Mel Gorman <mgorman@xxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Satoru Moriya <satoru.moriya@xxxxxxx>
Cc: Simon Jeons <simon.jeons@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 20 +++++++++++---------
1 file changed, 11 insertions(+), 9 deletions(-)
diff -puN mm/vmscan.c~mm-memcg-only-evict-file-pages-when-we-have-plenty mm/vmscan.c
--- a/mm/vmscan.c~mm-memcg-only-evict-file-pages-when-we-have-plenty
+++ a/mm/vmscan.c
@@ -1700,19 +1700,21 @@ static void get_scan_count(struct lruvec
fraction[1] = 0;
denominator = 1;
goto out;
- } else if (!inactive_file_is_low_global(zone)) {
- /*
- * There is enough inactive page cache, do not
- * reclaim anything from the working set right now.
- */
- fraction[0] = 0;
- fraction[1] = 1;
- denominator = 1;
- goto out;
}
}
/*
+ * There is enough inactive page cache, do not reclaim
+ * anything from the anonymous working set right now.
+ */
+ if (!inactive_file_is_low(lruvec)) {
+ fraction[0] = 0;
+ fraction[1] = 1;
+ denominator = 1;
+ goto out;
+ }
+
+ /*
* With swappiness at 100, anonymous and file have the same priority.
* This scanning priority is essentially the inverse of IO cost.
*/
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
origin.patch
mm-fix-calculation-of-dirtyable-memory.patch
mm-memcg-only-evict-file-pages-when-we-have-plenty.patch
mm-vmscan-save-work-scanning-almost-empty-lru-lists.patch
mm-vmscan-clarify-how-swappiness-highest-priority-memcg-interact.patch
mm-vmscan-improve-comment-on-low-page-cache-handling.patch
mm-vmscan-clean-up-get_scan_count.patch
mm-vmscan-clean-up-get_scan_count-fix.patch
mm-vmscan-compaction-works-against-zones-not-lruvecs.patch
mm-vmscan-compaction-works-against-zones-not-lruvecs-fix.patch
mm-reduce-rmap-overhead-for-ex-ksm-page-copies-created-on-swap-faults.patch
mm-page_allocc-__setup_per_zone_wmarks-make-min_pages-unsigned-long.patch
mm-vmscanc-__zone_reclaim-replace-max_t-with-max.patch
mm-memmap_init_zone-performance-improvement.patch
memcg-debugging-facility-to-access-dangling-memcgs.patch
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