diff options
| author | Ben Segall <bsegall@google.com> | 2013-10-16 11:16:12 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-15 15:31:43 -0800 |
| commit | e99a2cb2dcbe92b33be7ab60035da0e5b94cfcae (patch) | |
| tree | b65e1746e160d1c8b2b43e0cfff84c15e35a085b /lib/mpi/mpiutil.c | |
| parent | 807a0c12941850ddaff2ed62ba26a748e542c599 (diff) | |
sched: Fix race on toggling cfs_bandwidth_used
commit 1ee14e6c8cddeeb8a490d7b54cd9016e4bb900b4 upstream.
When we transition cfs_bandwidth_used to false, any currently
throttled groups will incorrectly return false from cfs_rq_throttled.
While tg_set_cfs_bandwidth will unthrottle them eventually, currently
running code (including at least dequeue_task_fair and
distribute_cfs_runtime) will cause errors.
Fix this by turning off cfs_bandwidth_used only after unthrottling all
cfs_rqs.
Tested: toggle bandwidth back and forth on a loaded cgroup. Caused
crashes in minutes without the patch, hasn't crashed with it.
Signed-off-by: Ben Segall <bsegall@google.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: pjt@google.com
Link: http://lkml.kernel.org/r/20131016181611.22647.80365.stgit@sword-of-the-dawn.mtv.corp.google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Chris J Arges <chris.j.arges@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/mpi/mpiutil.c')
0 files changed, 0 insertions, 0 deletions