linux-kernel - [RFC,PATCH 0/2] cputimers/proc: can't we make /proc/pid/stat less accurate?

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Message-ID: <20100324204545.GA31769@redhat.com>
Date:	Wed, 24 Mar 2010 21:45:45 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Americo Wang <xiyou.wangcong@...il.com>,
	Balbir Singh <balbir@...ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	Spencer Candland <spencer@...ehost.com>,
	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [RFC,PATCH 0/2] cputimers/proc: can't we make /proc/pid/stat less
	accurate?

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.

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