summaryrefslogtreecommitdiff
path: root/mm
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2014-10-02 16:29:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-02 16:29:19 -0700
commitf929d3995d61ee0ff5d35e9f3fbef3b80bf4ccaa (patch)
tree12378638e4eb6cf56036029e4a6bc4e38478005c /mm
parentb601ce0fe3aafadba21cd42eb3d63660010e2a2b (diff)
parentabe5f972912d086c080be4bde67750630b6fb38b (diff)
downloadlinux-f929d3995d61ee0ff5d35e9f3fbef3b80bf4ccaa.tar.gz
Merge branch 'akpm' (fixes from Andrew Morton)
Merge fixes from Andrew Morton: "5 fixes" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: mm: page_alloc: fix zone allocation fairness on UP perf: fix perf bug in fork() MAINTAINERS: change git URL for mpc5xxx tree mm: memcontrol: do not iterate uninitialized memcgs ocfs2/dlm: should put mle when goto kill in dlm_assert_master_handler
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c36
-rw-r--r--mm/page_alloc.c7
2 files changed, 34 insertions, 9 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 085dc6d2f876..28928ce9b07f 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -292,6 +292,9 @@ struct mem_cgroup {
/* vmpressure notifications */
struct vmpressure vmpressure;
+ /* css_online() has been completed */
+ int initialized;
+
/*
* the counter to account for mem+swap usage.
*/
@@ -1099,10 +1102,21 @@ skip_node:
* skipping css reference should be safe.
*/
if (next_css) {
- if ((next_css == &root->css) ||
- ((next_css->flags & CSS_ONLINE) &&
- css_tryget_online(next_css)))
- return mem_cgroup_from_css(next_css);
+ struct mem_cgroup *memcg = mem_cgroup_from_css(next_css);
+
+ if (next_css == &root->css)
+ return memcg;
+
+ if (css_tryget_online(next_css)) {
+ /*
+ * Make sure the memcg is initialized:
+ * mem_cgroup_css_online() orders the the
+ * initialization against setting the flag.
+ */
+ if (smp_load_acquire(&memcg->initialized))
+ return memcg;
+ css_put(next_css);
+ }
prev_css = next_css;
goto skip_node;
@@ -5549,6 +5563,7 @@ mem_cgroup_css_online(struct cgroup_subsys_state *css)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
struct mem_cgroup *parent = mem_cgroup_from_css(css->parent);
+ int ret;
if (css->id > MEM_CGROUP_ID_MAX)
return -ENOSPC;
@@ -5585,7 +5600,18 @@ mem_cgroup_css_online(struct cgroup_subsys_state *css)
}
mutex_unlock(&memcg_create_mutex);
- return memcg_init_kmem(memcg, &memory_cgrp_subsys);
+ ret = memcg_init_kmem(memcg, &memory_cgrp_subsys);
+ if (ret)
+ return ret;
+
+ /*
+ * Make sure the memcg is initialized: mem_cgroup_iter()
+ * orders reading memcg->initialized against its callers
+ * reading the memcg members.
+ */
+ smp_store_release(&memcg->initialized, 1);
+
+ return 0;
}
/*
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 18cee0d4c8a2..eee961958021 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1612,7 +1612,7 @@ again:
}
__mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order));
- if (zone_page_state(zone, NR_ALLOC_BATCH) == 0 &&
+ if (atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH]) <= 0 &&
!zone_is_fair_depleted(zone))
zone_set_flag(zone, ZONE_FAIR_DEPLETED);
@@ -5701,9 +5701,8 @@ static void __setup_per_zone_wmarks(void)
zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + (tmp >> 1);
__mod_zone_page_state(zone, NR_ALLOC_BATCH,
- high_wmark_pages(zone) -
- low_wmark_pages(zone) -
- zone_page_state(zone, NR_ALLOC_BATCH));
+ high_wmark_pages(zone) - low_wmark_pages(zone) -
+ atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH]));
setup_zone_migrate_reserve(zone);
spin_unlock_irqrestore(&zone->lock, flags);