linux-kernel - Re: [git] CFS-devel, group scheduler, fixes

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Message-ID: <20070921031139.GA19584@1wt.eu>
Date:	Fri, 21 Sep 2007 05:11:39 +0200
From:	Willy Tarreau <w@....eu>
To:	Mike Galbraith <efault@....de>
Cc:	Tong Li <tong.n.li@...el.com>, Ingo Molnar <mingo@...e.hu>,
	dimm <dmitry.adamushko@...il.com>, linux-kernel@...r.kernel.org,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [git] CFS-devel, group scheduler, fixes

On Fri, Sep 21, 2007 at 04:40:55AM +0200, Mike Galbraith wrote:
> On Thu, 2007-09-20 at 21:48 +0200, Willy Tarreau wrote:
> 
> > I don't know if this is relevant, but 4294966399 in nr_uninterruptible
> > for cpu#0 equals -897, exactly the negation of cpu1.nr_uninterruptible.
> > I don't know if this rings a bell for someone or if it's a completely
> > useless comment, but just in case...
> 
> A task can block on one cpu, and wake up on another, which isn't
> tracked, hence the fishy looking numbers.  The true nr_uninterruptible
> is the sum of all.

OK, thanks Mike for this clarification.

Willy

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