The patch titled
cpuset: check if the cpus allowed is a subset of the cpuset's cpus for PF_THREAD_BOUND threads
has been removed from the -mm tree. Its filename was
cpuset-check-if-the-cpus-allowed-is-a-subset-of-the-cpusets-cpus-for-pf_thread_bound-threads.patch
This patch was dropped because an alternative patch was merged
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: cpuset: check if the cpus allowed is a subset of the cpuset's cpus for PF_THREAD_BOUND threads
From: Dhaval Giani <dhaval@xxxxxxxxxxxxxxxxxx>
When a kernel thread which has been bound to a CPU is moved to a cpuset
which is a superset of the CPU it is bound to, the movement fails.
[root@llm11 cgroups]# mkdir a
[root@llm11 cgroups]# echo 3 > a/cpuset.cpus
[root@llm11 cgroups]# echo 0 > a/cpuset.mems
[root@llm11 cgroups]# echo 12 > a/tasks
[root@llm11 cgroups]# echo 12 > tasks
-bash: echo: write error: Invalid argument
[root@llm11 cgroups]# cat cpuset.cpus
0-7
[root@llm11 cgroups]#
(pid 12 is the migration thread bound to CPU 3)
Change the check to see if the cpus allowed is a subset of the cpus
allowed for that cpuset.
Signed-off-by: Dhaval Giani <dhaval@xxxxxxxxxxxxxxxxxx>
Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxx>
Cc: Paul Menage <menage@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/cpuset.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/cpuset.c~cpuset-check-if-the-cpus-allowed-is-a-subset-of-the-cpusets-cpus-for-pf_thread_bound-threads kernel/cpuset.c
--- a/kernel/cpuset.c~cpuset-check-if-the-cpus-allowed-is-a-subset-of-the-cpusets-cpus-for-pf_thread_bound-threads
+++ a/kernel/cpuset.c
@@ -1349,7 +1349,7 @@ static int cpuset_can_attach(struct cgro
if (tsk->flags & PF_THREAD_BOUND) {
mutex_lock(&callback_mutex);
- if (!cpumask_equal(&tsk->cpus_allowed, cs->cpus_allowed))
+ if (!cpumask_subset(&tsk->cpus_allowed, cs->cpus_allowed))
ret = -EINVAL;
mutex_unlock(&callback_mutex);
}
_
Patches currently in -mm which might be from dhaval@xxxxxxxxxxxxxxxxxx are
cgroup-css-id-support-remove-rcu_read_lock-from-css_get_next.patch
cpusets-prevent-pf_thread_bound-tasks-from-attaching-to-non-root-cpusets.patch
cpuset-check-if-the-cpus-allowed-is-a-subset-of-the-cpusets-cpus-for-pf_thread_bound-threads.patch
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