lkml.org 
[lkml]   [2016]   [Nov]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
Subject[PATCH 3.16 166/346] cpuset: make sure new tasks conform to the current config of the cpuset
3.16.39-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Zefan Li <lizefan@huawei.com>

commit 06f4e94898918bcad00cdd4d349313a439d6911e upstream.

A new task inherits cpus_allowed and mems_allowed masks from its parent,
but if someone changes cpuset's config by writing to cpuset.cpus/cpuset.mems
before this new task is inserted into the cgroup's task list, the new task
won't be updated accordingly.

Signed-off-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
kernel/cpuset.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1963,6 +1963,20 @@ static void cpuset_css_free(struct cgrou
kfree(cs);
}

+/*
+ * Make sure the new task conform to the current state of its parent,
+ * which could have been changed by cpuset just after it inherits the
+ * state from the parent and before it sits on the cgroup's task list.
+ */
+void cpuset_fork(struct task_struct *task)
+{
+ if (task_css_is_root(task, cpuset_cgrp_id))
+ return;
+
+ set_cpus_allowed_ptr(task, &current->cpus_allowed);
+ task->mems_allowed = current->mems_allowed;
+}
+
struct cgroup_subsys cpuset_cgrp_subsys = {
.css_alloc = cpuset_css_alloc,
.css_online = cpuset_css_online,
@@ -1971,6 +1985,7 @@ struct cgroup_subsys cpuset_cgrp_subsys
.can_attach = cpuset_can_attach,
.cancel_attach = cpuset_cancel_attach,
.attach = cpuset_attach,
+ .fork = cpuset_fork,
.base_cftypes = files,
.early_init = 1,
};
\
 
 \ /
  Last update: 2016-11-14 03:57    [W:2.527 / U:1.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site