The patch titled
Subject: mm, memcg: propagate memory effective protection on setting memory.min/low
has been removed from the -mm tree. Its filename was
mm-memcg-propagate-memory-effective-protection-on-setting-memorymin-low.patch
This patch was dropped because it was withdrawn
------------------------------------------------------
From: Roman Gushchin <guro@xxxxxx>
Subject: mm, memcg: propagate memory effective protection on setting memory.min/low
Explicitly propagate effective memory min/low values down by the tree.
If there is global memory pressure, it's not really necessary. Effective
memory guarantees will be propagated automatically as we traverse memory
cgroup tree in the reclaim path.
But if there is no global memory pressure, effective memory protection
still matters for local (memcg-scoped) memory pressure. So, we have to
update effective limits in the subtree, if a user changes memory.min and
memory.low values.
Link: http://lkml.kernel.org/r/20180522132528.23769-1-guro@xxxxxx
Link: http://lkml.kernel.org/r/20180611175418.7007-3-guro@xxxxxx
Signed-off-by: Roman Gushchin <guro@xxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Greg Thelen <gthelen@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff -puN mm/memcontrol.c~mm-memcg-propagate-memory-effective-protection-on-setting-memorymin-low mm/memcontrol.c
--- a/mm/memcontrol.c~mm-memcg-propagate-memory-effective-protection-on-setting-memorymin-low
+++ a/mm/memcontrol.c
@@ -5084,7 +5084,7 @@ static int memory_min_show(struct seq_fi
static ssize_t memory_min_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
- struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
+ struct mem_cgroup *iter, *memcg = mem_cgroup_from_css(of_css(of));
unsigned long min;
int err;
@@ -5095,6 +5095,11 @@ static ssize_t memory_min_write(struct k
page_counter_set_min(&memcg->memory, min);
+ rcu_read_lock();
+ for_each_mem_cgroup_tree(iter, memcg)
+ mem_cgroup_protected(NULL, iter);
+ rcu_read_unlock();
+
return nbytes;
}
@@ -5114,7 +5119,7 @@ static int memory_low_show(struct seq_fi
static ssize_t memory_low_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
- struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
+ struct mem_cgroup *iter, *memcg = mem_cgroup_from_css(of_css(of));
unsigned long low;
int err;
@@ -5125,6 +5130,11 @@ static ssize_t memory_low_write(struct k
page_counter_set_low(&memcg->memory, low);
+ rcu_read_lock();
+ for_each_mem_cgroup_tree(iter, memcg)
+ mem_cgroup_protected(NULL, iter);
+ rcu_read_unlock();
+
return nbytes;
}
_
Patches currently in -mm which might be from guro@xxxxxx are
mm-fix-null-pointer-dereference-in-mem_cgroup_protected.patch
mm-oom-refactor-the-oom_kill_process-function.patch
mm-implement-mem_cgroup_scan_tasks-for-the-root-memory-cgroup.patch
mm-oom-cgroup-aware-oom-killer.patch
mm-oom-introduce-memoryoom_group.patch
mm-oom-introduce-memoryoom_group-fix.patch
mm-oom-add-cgroup-v2-mount-option-for-cgroup-aware-oom-killer.patch
mm-oom-docs-describe-the-cgroup-aware-oom-killer.patch
mm-oom-docs-describe-the-cgroup-aware-oom-killer-fix.patch
cgroup-list-groupoom-in-cgroup-features.patch
mm-fix-oom_kill-event-handling.patch
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