Subject: + mm-memcontrol-remove-hierarchy-restrictions-for-swappiness-and-oom_control.patch added to -mm tree
To: hannes@xxxxxxxxxxx,mhocko@xxxxxxx,rientjes@xxxxxxxxxx,tj@xxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Wed, 16 Apr 2014 14:34:35 -0700
The patch titled
Subject: mm: memcontrol: remove hierarchy restrictions for swappiness and oom_control
has been added to the -mm tree. Its filename is
mm-memcontrol-remove-hierarchy-restrictions-for-swappiness-and-oom_control.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memcontrol-remove-hierarchy-restrictions-for-swappiness-and-oom_control.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memcontrol-remove-hierarchy-restrictions-for-swappiness-and-oom_control.patch
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: memcontrol: remove hierarchy restrictions for swappiness and oom_control
Per-memcg swappiness and oom killing can currently not be tweaked on a
memcg that is part of a hierarchy, but not the root of that hierarchy.
Users have complained that they can't configure this when they turned on
hierarchy mode. In fact, with hierarchy mode becoming the default, this
restriction disables the tunables entirely.
But there is no good reason for this restriction. The settings for
swappiness and OOM killing are taken from whatever memcg whose limit
triggered reclaim and OOM invocation, regardless of its position in the
hierarchy tree.
Allow setting swappiness on any group. The knob on the root memcg already
reads the global VM swappiness, make it writable as well.
Allow disabling the OOM killer on any non-root memcg.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 29 +++++++----------------------
1 file changed, 7 insertions(+), 22 deletions(-)
diff -puN mm/memcontrol.c~mm-memcontrol-remove-hierarchy-restrictions-for-swappiness-and-oom_control mm/memcontrol.c
--- a/mm/memcontrol.c~mm-memcontrol-remove-hierarchy-restrictions-for-swappiness-and-oom_control
+++ a/mm/memcontrol.c
@@ -5443,22 +5443,14 @@ static int mem_cgroup_swappiness_write(s
struct cftype *cft, u64 val)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
- struct mem_cgroup *parent = mem_cgroup_from_css(css_parent(&memcg->css));
- if (val > 100 || !parent)
+ if (val > 100)
return -EINVAL;
- mutex_lock(&memcg_create_mutex);
-
- /* If under hierarchy, only empty-root can set this value */
- if ((parent->use_hierarchy) || memcg_has_children(memcg)) {
- mutex_unlock(&memcg_create_mutex);
- return -EINVAL;
- }
-
- memcg->swappiness = val;
-
- mutex_unlock(&memcg_create_mutex);
+ if (css_parent(css))
+ memcg->swappiness = val;
+ else
+ vm_swappiness = val;
return 0;
}
@@ -5790,22 +5782,15 @@ static int mem_cgroup_oom_control_write(
struct cftype *cft, u64 val)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
- struct mem_cgroup *parent = mem_cgroup_from_css(css_parent(&memcg->css));
/* cannot set to root cgroup and only 0 and 1 are allowed */
- if (!parent || !((val == 0) || (val == 1)))
+ if (!css_parent(css) || !((val == 0) || (val == 1)))
return -EINVAL;
- mutex_lock(&memcg_create_mutex);
- /* oom-kill-disable is a flag for subhierarchy. */
- if ((parent->use_hierarchy) || memcg_has_children(memcg)) {
- mutex_unlock(&memcg_create_mutex);
- return -EINVAL;
- }
memcg->oom_kill_disable = val;
if (!val)
memcg_oom_recover(memcg);
- mutex_unlock(&memcg_create_mutex);
+
return 0;
}
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
slb-charge-slabs-to-kmemcg-explicitly.patch
mm-get-rid-of-__gfp_kmemcg.patch
pagewalk-update-page-table-walker-core.patch
pagewalk-add-walk_page_vma.patch
smaps-redefine-callback-functions-for-page-table-walker.patch
clear_refs-redefine-callback-functions-for-page-table-walker.patch
pagemap-redefine-callback-functions-for-page-table-walker.patch
numa_maps-redefine-callback-functions-for-page-table-walker.patch
memcg-redefine-callback-functions-for-page-table-walker.patch
arch-powerpc-mm-subpage-protc-use-walk_page_vma-instead-of-walk_page_range.patch
pagewalk-remove-argument-hmask-from-hugetlb_entry.patch
mempolicy-apply-page-table-walker-on-queue_pages_range.patch
mm-memcontrol-remove-hierarchy-restrictions-for-swappiness-and-oom_control.patch
linux-next.patch
debugging-keep-track-of-page-owners.patch
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