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authorJohannes Weiner <hannes@cmpxchg.org>2015-01-08 14:32:35 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-01-08 15:10:52 -0800
commit24d404dc10b903da271e943a0f6b032dcbd177d8 (patch)
tree23c537f967a9522fb4e0a8a117b490b725453291 /mm
parent70ecb3cb033f37fd5024448f809ea028fb85c28b (diff)
downloadop-kernel-dev-24d404dc10b903da271e943a0f6b032dcbd177d8.zip
op-kernel-dev-24d404dc10b903da271e943a0f6b032dcbd177d8.tar.gz
mm: memcontrol: switch soft limit default back to infinity
Commit 3e32cb2e0a12 ("mm: memcontrol: lockless page counters") accidentally switched the soft limit default from infinity to zero, which turns all memcgs with even a single page into soft limit excessors and engages soft limit reclaim on all of them during global memory pressure. This makes global reclaim generally more aggressive, but also inverts the meaning of existing soft limit configurations where unset soft limits are usually more generous than set ones. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.cz> Acked-by: Vladimir Davydov <vdavydov@parallels.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ef91e85..b7104a5 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4679,6 +4679,7 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
if (parent_css == NULL) {
root_mem_cgroup = memcg;
page_counter_init(&memcg->memory, NULL);
+ memcg->soft_limit = PAGE_COUNTER_MAX;
page_counter_init(&memcg->memsw, NULL);
page_counter_init(&memcg->kmem, NULL);
}
@@ -4724,6 +4725,7 @@ mem_cgroup_css_online(struct cgroup_subsys_state *css)
if (parent->use_hierarchy) {
page_counter_init(&memcg->memory, &parent->memory);
+ memcg->soft_limit = PAGE_COUNTER_MAX;
page_counter_init(&memcg->memsw, &parent->memsw);
page_counter_init(&memcg->kmem, &parent->kmem);
@@ -4733,6 +4735,7 @@ mem_cgroup_css_online(struct cgroup_subsys_state *css)
*/
} else {
page_counter_init(&memcg->memory, NULL);
+ memcg->soft_limit = PAGE_COUNTER_MAX;
page_counter_init(&memcg->memsw, NULL);
page_counter_init(&memcg->kmem, NULL);
/*
@@ -4807,7 +4810,7 @@ static void mem_cgroup_css_reset(struct cgroup_subsys_state *css)
mem_cgroup_resize_limit(memcg, PAGE_COUNTER_MAX);
mem_cgroup_resize_memsw_limit(memcg, PAGE_COUNTER_MAX);
memcg_update_kmem_limit(memcg, PAGE_COUNTER_MAX);
- memcg->soft_limit = 0;
+ memcg->soft_limit = PAGE_COUNTER_MAX;
}
#ifdef CONFIG_MMU
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