The patch titled
Subject: mm, memcg: propagate memory effective protection on setting memory.min/low
has been added to the -mm tree. Its filename is
mm-propagate-memory-effective-protection-on-setting-memorymin-low.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-propagate-memory-effective-protection-on-setting-memorymin-low.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-propagate-memory-effective-protection-on-setting-memorymin-low.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
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 the 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
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-propagate-memory-effective-protection-on-setting-memorymin-low mm/memcontrol.c
--- a/mm/memcontrol.c~mm-propagate-memory-effective-protection-on-setting-memorymin-low
+++ a/mm/memcontrol.c
@@ -5374,7 +5374,7 @@ 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;
@@ -5385,6 +5385,11 @@ 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;
}
@@ -5404,7 +5409,7 @@ 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;
@@ -5415,6 +5420,11 @@ 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-rename-page_counters-count-limit-into-usage-max.patch
mm-memorylow-hierarchical-behavior.patch
mm-treat-memorylow-value-inclusive.patch
mm-docs-describe-memorylow-refinements.patch
mm-introduce-memorymin.patch
mm-introduce-memorymin-fix.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
mm-propagate-memory-effective-protection-on-setting-memorymin-low.patch
mm-dont-skip-memory-guarantee-calculations.patch
selftests-cgroup-add-test-for-memorylow-corner-cases.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
