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mm: memcg: only evict file pages when we have plenty

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Commit e986850598 ("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@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Satoru Moriya <satoru.moriya@hds.com>
Cc: Simon Jeons <simon.jeons@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2013-02-22 16:32:10 -08:00 committed by Linus Torvalds
parent 2a6f512412
commit 7c5bd705d8
1 changed files with 11 additions and 9 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

20
mm/vmscan.c
View file

@ -1700,18 +1700,20 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
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.