The commit is pushed to "branch-rh7-3.10.0-229.7.2.vz7.8.x-ovz" and will appear
at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-229.7.2.vz7.8.4
------>
commit b5f889b9404ef2e039fa59ff80c217baca49a927
Author: Vladimir Davydov <vdavy...@virtuozzo.com>
Date: Thu Oct 8 16:45:28 2015 +0400
tcache: do not try to create node if we are not going to store page
Currently, we try to create a tcache node even if we are not going to
actually store a page in tcache (tcache is disabled or we are called by
global reclaimer). This is suboptimal, because we will drop the node
anyway then.
Signed-off-by: Vladimir Davydov <vdavy...@virtuozzo.com>
Reviewed-by: Kirill Tkhai <ktk...@odin.com>
---
mm/tcache.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/mm/tcache.c b/mm/tcache.c
index b078c84..ce5b0ed 100644
--- a/mm/tcache.c
+++ b/mm/tcache.c
@@ -835,10 +835,15 @@ static void tcache_cleancache_put_page(int pool_id,
{
struct tcache_node *node;
struct page *cache_page = NULL;
+ bool may_put = ACCESS_ONCE(tcache_active);
- node = tcache_get_node_and_pool(pool_id, &key, true);
+ /* It makes no sense to populate tcache when we are short on memory */
+ if (current->flags & PF_MEMALLOC)
+ may_put = false;
+
+ node = tcache_get_node_and_pool(pool_id, &key, may_put);
if (node) {
- if (tcache_active && !(current->flags & PF_MEMALLOC))
+ if (may_put)
cache_page = tcache_alloc_page();
if (cache_page) {
copy_highpage(cache_page, page);
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