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| author |   Tejun Heo <tj@kernel.org> | 2015-09-16 13:03:02 -0400 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2015-09-16 13:03:46 -0400 |
| commit | 3014dde762f618fbcfe899f9ce9e929a2e5aa6dd (patch) | |
| tree | 56e6df9207ba153da5cc9e6b989b00a40477dff1 /include/linux | |
| parent | sched, cgroup: replace signal_struct->group_rwsem with a global percpu_rwsem (diff) | |
| download | linux-dev-3014dde762f618fbcfe899f9ce9e929a2e5aa6dd.tar.xz linux-dev-3014dde762f618fbcfe899f9ce9e929a2e5aa6dd.zip | |
cgroup: simplify threadgroup locking
Note: This commit was originally committed as b5ba75b5fc0e but got
reverted by f9f9e7b77614 due to the performance regression from
the percpu_rwsem write down/up operations added to cgroup task
migration path. percpu_rwsem changes which alleviate the
performance issue are pending for v4.4-rc1 merge window.
Re-apply.
Now that threadgroup locking is made global, code paths around it can
be simplified.
* lock-verify-unlock-retry dancing removed from __cgroup_procs_write().
* Race protection against de_thread() removed from
cgroup_update_dfl_csses().
Signed-off-by: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/g/55F8097A.7000206@de.ibm.com
Diffstat (limited to 'include/linux')
0 files changed, 0 insertions, 0 deletions