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pidns: Use task_active_pid_ns where appropriate

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The expressions tsk->nsproxy->pid_ns and task_active_pid_ns
aka ns_of_pid(task_pid(tsk)) should have the same number of
cache line misses with the practical difference that
ns_of_pid(task_pid(tsk)) is released later in a processes life.

Furthermore by using task_active_pid_ns it becomes trivial
to write an unshare implementation for the the pid namespace.

So I have used task_active_pid_ns everywhere I can.

In fork since the pid has not yet been attached to the
process I use ns_of_pid, to achieve the same effect.

Signed-off-by: Eric W. Biederman <[email protected]>
This commit is contained in:
Eric W. Biederman 2010-03-02 14:51:53 -08:00
commit 17cf22c33e
12 changed files with 16 additions and 15 deletions
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2
kernel/events/core.c
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@ -6155,7 +6155,7 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
event->parent = parent_event;
event->ns = get_pid_ns(current->nsproxy->pid_ns);
event->ns = get_pid_ns(task_active_pid_ns(current));
event->id = atomic64_inc_return(&perf_event_id);
event->state = PERF_EVENT_STATE_INACTIVE;