Mostly to provoke the discussion and untested, please comment.

In short: I do not actually know if /proc/pid/stat should be "really"
accurate wrt cpu accounting. I mean, I don't know how much /bin/top
and friends depend on xtime monotonicity.

However, it is sad that /proc/pid/stat iterates over ->thread_group
_twice_ under ->siglock.

Any thoughts?

Oleg.

--

[ message continues ]