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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2011-02-07 17:02:20 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-02-16 13:30:47 +0100 |
| commit | d41d5a01631af821d3a3447e6613a316f5ee6c25 (patch) | |
| tree | 405ab6bc24e06a64dc17ccafb6daead1400cb29e /kernel/cgroup.c | |
| parent | b00560f2d4de69bb12f66f9605985b516df98d77 (diff) | |
| download | linux-d41d5a01631af821d3a3447e6613a316f5ee6c25.tar.gz linux-d41d5a01631af821d3a3447e6613a316f5ee6c25.tar.bz2 linux-d41d5a01631af821d3a3447e6613a316f5ee6c25.zip | |
cgroup: Fix cgroup_subsys::exit callback
Make the ::exit method act like ::attach, it is after all very nearly
the same thing.
The bug had no effect on correctness - fixing it is an optimization for
the scheduler. Also, later perf-cgroups patches rely on it.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Paul Menage <menage@google.com>
LKML-Reference: <1297160655.13327.92.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 31 |
1 files changed, 18 insertions, 13 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index b24d7027b83c..f6495f33a355 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -4230,20 +4230,8 @@ void cgroup_post_fork(struct task_struct *child) */ void cgroup_exit(struct task_struct *tsk, int run_callbacks) { - int i; struct css_set *cg; - - if (run_callbacks && need_forkexit_callback) { - /* - * modular subsystems can't use callbacks, so no need to lock - * the subsys array - */ - for (i = 0; i < CGROUP_BUILTIN_SUBSYS_COUNT; i++) { - struct cgroup_subsys *ss = subsys[i]; - if (ss->exit) - ss->exit(ss, tsk); - } - } + int i; /* * Unlink from the css_set task list if necessary. @@ -4261,7 +4249,24 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks) task_lock(tsk); cg = tsk->cgroups; tsk->cgroups = &init_css_set; + + if (run_callbacks && need_forkexit_callback) { + /* + * modular subsystems can't use callbacks, so no need to lock + * the subsys array + */ + for (i = 0; i < CGROUP_BUILTIN_SUBSYS_COUNT; i++) { + struct cgroup_subsys *ss = subsys[i]; + if (ss->exit) { + struct cgroup *old_cgrp = + rcu_dereference_raw(cg->subsys[i])->cgroup; + struct cgroup *cgrp = task_cgroup(tsk, i); + ss->exit(ss, cgrp, old_cgrp, tsk); + } + } + } task_unlock(tsk); + if (cg) put_css_set_taskexit(cg); } |