linux-kernel - Re: Revert for cgroups CPU accounting subsystem patch

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Message-ID: <6599ad830711122357i60482475o10c0e0935a9e00c0@mail.gmail.com>
Date:	Mon, 12 Nov 2007 23:57:03 -0800
From:	"Paul Menage" <menage@...gle.com>
To:	vatsa@...ux.vnet.ibm.com
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	containers@...ts.linux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Balbir Singh" <balbir@...ux.vnet.ibm.com>
Subject: Re: Revert for cgroups CPU accounting subsystem patch

On Nov 12, 2007 11:48 PM, Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com> wrote:
>
> Regarding your concern about tracking cpu usage in different ways, it
> could be mitigated if we have cpuacct controller track usage as per
> information present in a task's sched entity structure
> (tsk->se.sum_exec_runtime) i.e call cpuacct_charge() from
> __update_curr() which would accumulate the execution time of the
> group in a SMP friendly manner (i.e dump it in a per-cpu per-group counter
> first and then aggregate to a global per-group counter).

That seems more reasonable than the current approach in cpu_acct.c

Paul
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