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Subject[PATCH -mm 0/4] cputimers/proc: do_task_stat: don't walk through the thread list under ->siglock
On 03/29, Oleg Nesterov wrote:
>
> Yes sure. I dislike the do_task_stat() case because we always do this,
> even if this info is not needed, say, for /bin/ps.

Note also that nobody else in /fs/proc needs ->siglock. Except
do_io_accounting(), but in this case the user-space explicitly asks for
this info.


OK, This is V2. Still RFC, although I think 1/4 makes sense in any case.

Please comment. Again, I am more or less sure these changes are "correct",
but I don't know what /bin/top can think ;)

I don't really like the fact thread_group_times() takes cputimer.lock,
but imho lock_task_sighand() in do_task_stat() is much worse.

Oleg.



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