linux-kernel - Re: [PATCH 2/2] CFS CGroup: Report usage

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Message-ID: <6599ad830710222309j599d0e38xa7c4bdf7c160019a@mail.gmail.com>
Date:	Mon, 22 Oct 2007 23:09:29 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Srivatsa Vaddagiri" <vatsa@...ibm.com>,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] CFS CGroup: Report usage

On 10/22/07, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
>
> I think we also need the notion of load, like we have in cpu_acct.c

Yes, a notion of load would be good - but the "load" calculated by
cpu_acct.c isn't all that useful yet - it's just a total of the CPU
cycles used in the 10 second time interval prior to the current
interval. Something that's more analagous to the real machine load
would be nice, and I hope the numbers could be made available via CFS.

> Don't we need to do a css_get() on the cgrp to ensure that the cgroup
> does not go away if it's empty and someone does an rmdir on it?

See my other email. Yes, I think we need more here, but probably
something more generic.

Paul
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