aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux
diff options
context:
space:
mode:
authorJuri Lelli <juri.lelli@arm.com>2014-10-07 04:52:11 -0400
committerIngo Molnar <mingo@kernel.org>2014-10-28 05:48:00 -0400
commitf82f80426f7afcf55953924e71555984a4bd6ce6 (patch)
tree3a3e15c85f04c11d8f9bc0708b4c8ca439d3431b /include/linux
parent7f51412a415d87ea8598d14722fb31e4f5701257 (diff)
sched/deadline: Ensure that updates to exclusive cpusets don't break AC
How we deal with updates to exclusive cpusets is currently broken. As an example, suppose we have an exclusive cpuset composed of two cpus: A[cpu0,cpu1]. We can assign SCHED_DEADLINE task to it up to the allowed bandwidth. If we want now to modify cpusetA's cpumask, we have to check that removing a cpu's amount of bandwidth doesn't break AC guarantees. This thing isn't checked in the current code. This patch fixes the problem above, denying an update if the new cpumask won't have enough bandwidth for SCHED_DEADLINE tasks that are currently active. Signed-off-by: Juri Lelli <juri.lelli@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Li Zefan <lizefan@huawei.com> Cc: cgroups@vger.kernel.org Link: http://lkml.kernel.org/r/5433E6AF.5080105@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/sched.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1d1fa081d44f..320a9779f1b4 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2052,6 +2052,8 @@ static inline void tsk_restore_flags(struct task_struct *task,
2052 task->flags |= orig_flags & flags; 2052 task->flags |= orig_flags & flags;
2053} 2053}
2054 2054
2055extern int cpuset_cpumask_can_shrink(const struct cpumask *cur,
2056 const struct cpumask *trial);
2055extern int task_can_attach(struct task_struct *p, 2057extern int task_can_attach(struct task_struct *p,
2056 const struct cpumask *cs_cpus_allowed); 2058 const struct cpumask *cs_cpus_allowed);
2057#ifdef CONFIG_SMP 2059#ifdef CONFIG_SMP