The patch titled
Subject: mm,vmscan: only evict file pages when we have plenty
has been added to the -mm tree. Its filename is
mmvmscan-only-evict-file-pages-when-we-have-plenty.patch
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From: Rik van Riel <riel@xxxxxxxxxx>
Subject: mm,vmscan: only evict file pages when we have plenty
If we have more inactive file pages than active file pages, we skip
scanning the active file pages altogether, with the idea that we do not
want to evict the working set when there is plenty of streaming IO in the
cache.
However, the code forgot to also skip scanning anonymous pages in that
situation. That leads to the curious situation of keeping the active file
pages protected from being paged out when there are lots of inactive file
pages, while still scanning and evicting anonymous pages.
This patch fixes that situation, by only evicting file pages when we have
plenty of them and most are inactive.
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff -puN mm/vmscan.c~mmvmscan-only-evict-file-pages-when-we-have-plenty mm/vmscan.c
--- a/mm/vmscan.c~mmvmscan-only-evict-file-pages-when-we-have-plenty
+++ a/mm/vmscan.c
@@ -1686,6 +1686,15 @@ 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;
}
}
_
Patches currently in -mm which might be from riel@xxxxxxxxxx are
linux-next.patch
mm-vmscan-scale-number-of-pages-reclaimed-by-reclaim-compaction-only-in-direct-reclaim.patch
mmvmscan-only-evict-file-pages-when-we-have-plenty.patch
mmvmscan-only-evict-file-pages-when-we-have-plenty-fix.patch
swap-add-a-simple-detector-for-inappropriate-swapin-readahead.patch
swap-add-a-simple-detector-for-inappropriate-swapin-readahead-fix.patch
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