This is a note to let you know that I've just added the patch titled
cpuset: initialize effective masks when clone_children is enabled
to the 3.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cpuset-initialize-effective-masks-when-clone_children-is-enabled.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 790317e1b266c776765a4bdcedefea706ff0fada Mon Sep 17 00:00:00 2001
From: Zefan Li <[email protected]>
Date: Fri, 13 Feb 2015 11:19:49 +0800
Subject: cpuset: initialize effective masks when clone_children is enabled
From: Zefan Li <[email protected]>
commit 790317e1b266c776765a4bdcedefea706ff0fada upstream.
If clone_children is enabled, effective masks won't be initialized
due to the bug:
# mount -t cgroup -o cpuset xxx /mnt
# echo 1 > cgroup.clone_children
# mkdir /mnt/tmp
# cat /mnt/tmp/
# cat cpuset.effective_cpus
# cat cpuset.cpus
0-15
And then this cpuset won't constrain the tasks in it.
Either the bug or the fix has no effect on unified hierarchy, as
there's no clone_chidren flag there any more.
Reported-by: Christian Brauner <[email protected]>
Reported-by: Serge Hallyn <[email protected]>
Signed-off-by: Zefan Li <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
Tested-by: Serge Hallyn <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
kernel/cpuset.c | 2 ++
1 file changed, 2 insertions(+)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1992,7 +1992,9 @@ static int cpuset_css_online(struct cgro
spin_lock_irq(&callback_lock);
cs->mems_allowed = parent->mems_allowed;
+ cs->effective_mems = parent->mems_allowed;
cpumask_copy(cs->cpus_allowed, parent->cpus_allowed);
+ cpumask_copy(cs->effective_cpus, parent->cpus_allowed);
spin_unlock_irq(&callback_lock);
out_unlock:
mutex_unlock(&cpuset_mutex);
Patches currently in stable-queue which might be from [email protected] are
queue-3.19/cpuset-fix-a-warning-when-clearing-configured-masks-in-old-hierarchy.patch
queue-3.19/cpuset-fix-cpuset-sched_relax_domain_level.patch
queue-3.19/cpuset-initialize-effective-masks-when-clone_children-is-enabled.patch
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