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authorKirill Tkhai <ktkhai@virtuozzo.com>2018-08-17 15:48:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-17 16:20:31 -0700
commit9b996468cfdba09f688f52dba4287de596194613 (patch)
tree08aec8315f3849e4f813a3c2de88ade769bca3bb /mm/workingset.c
parentaeed1d325d429ac9699c4bf62d17156d60905519 (diff)
mm: add SHRINK_EMPTY shrinker methods return value
We need to distinguish the situations when shrinker has very small amount of objects (see vfs_pressure_ratio() called from super_cache_count()), and when it has no objects at all. Currently, in the both of these cases, shrinker::count_objects() returns 0. The patch introduces new SHRINK_EMPTY return value, which will be used for "no objects at all" case. It's is a refactoring mostly, as SHRINK_EMPTY is replaced by 0 by all callers of do_shrink_slab() in this patch, and all the magic will happen in further. Link: http://lkml.kernel.org/r/153063069574.1818.11037751256699341813.stgit@localhost.localdomain Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com> Tested-by: Shakeel Butt <shakeelb@google.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Guenter Roeck <linux@roeck-us.net> Cc: "Huang, Ying" <ying.huang@intel.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Josef Bacik <jbacik@fb.com> Cc: Li RongQing <lirongqing@baidu.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matthias Kaehlcke <mka@chromium.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Cc: Roman Gushchin <guro@fb.com> Cc: Sahitya Tummala <stummala@codeaurora.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman Long <longman@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/workingset.c')
-rw-r--r--mm/workingset.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/workingset.c b/mm/workingset.c
index cd0b2ae615e4..bc72ad029b3e 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -399,6 +399,9 @@ static unsigned long count_shadow_nodes(struct shrinker *shrinker,
}
max_nodes = cache >> (RADIX_TREE_MAP_SHIFT - 3);
+ if (!nodes)
+ return SHRINK_EMPTY;
+
if (nodes <= max_nodes)
return 0;
return nodes - max_nodes;