The patch titled
Subject: vmscan-do-not-force-scan-file-lru-if-its-absolute-size-is-small-v2
has been added to the -mm tree. Its filename is
vmscan-do-not-force-scan-file-lru-if-its-absolute-size-is-small-v2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/vmscan-do-not-force-scan-file-lru-if-its-absolute-size-is-small-v2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/vmscan-do-not-force-scan-file-lru-if-its-absolute-size-is-small-v2.patch
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------------------------------------------------------
From: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Subject: vmscan-do-not-force-scan-file-lru-if-its-absolute-size-is-small-v2
Changes in v2:
- remove unnecessary > 0 (Johannes)
- elaborate on the comment (Andrew)
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff -puN mm/vmscan.c~vmscan-do-not-force-scan-file-lru-if-its-absolute-size-is-small-v2 mm/vmscan.c
--- a/mm/vmscan.c~vmscan-do-not-force-scan-file-lru-if-its-absolute-size-is-small-v2
+++ a/mm/vmscan.c
@@ -2043,11 +2043,16 @@ static void get_scan_count(struct lruvec
}
/*
- * There is enough inactive page cache, do not reclaim
- * anything from the anonymous working set right now.
+ * If there is enough inactive page cache, i.e. if the size of the
+ * inactive list is greater than that of the active list *and* the
+ * inactive list actually has some pages to scan on this priority, we
+ * do not reclaim anything from the anonymous working set right now.
+ * Without the second condition we could end up never scanning an
+ * lruvec even if it has plenty of old anonymous pages unless the
+ * system is under heavy pressure.
*/
if (!inactive_file_is_low(lruvec) &&
- get_lru_size(lruvec, LRU_INACTIVE_FILE) >> sc->priority > 0) {
+ get_lru_size(lruvec, LRU_INACTIVE_FILE) >> sc->priority) {
scan_balance = SCAN_FILE;
goto out;
}
_
Patches currently in -mm which might be from vdavydov@xxxxxxxxxxxxx are
revert-kernfs-do-not-account-ino_ida-allocations-to-memcg.patch
revert-gfp-add-__gfp_noaccount.patch
memcg-only-account-kmem-allocations-marked-as-__gfp_account.patch
slab-add-slab_account-flag.patch
vmalloc-allow-to-account-vmalloc-to-memcg.patch
account-certain-kmem-allocations-to-memcg.patch
vmscan-do-not-force-scan-file-lru-if-its-absolute-size-is-small.patch
vmscan-do-not-force-scan-file-lru-if-its-absolute-size-is-small-v2.patch
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