From: David Rientjes on
On Fri, 2 Apr 2010, Oleg Nesterov wrote:

> It doesn't make sense to call thread_group_cputime() under task_lock(),
> we can drop this lock right after we read get_mm_rss() and save the
> value in the local variable.
> Note: probably it makes more sense to use sum_exec_runtime instead
> of utime + stime, it is much more precise. A task can eat a lot of
> CPU time, but its Xtime can be zero.
> Signed-off-by: Oleg Nesterov <oleg(a)>

Acked-by: David Rientjes <rientjes(a)>
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