linux-kernel - Re: volanoMark regression with kernel 2.6.26-rc1

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Message-ID: <20080515082033.GA14823@linux.vnet.ibm.com>
Date:	Thu, 15 May 2008 13:50:33 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Mike Galbraith <efault@....de>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Aneesh Kumar KV <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: volanoMark regression with kernel 2.6.26-rc1

On Wed, May 14, 2008 at 05:12:47PM +0200, Peter Zijlstra wrote:
> A few other things I found that make a significant difference:

One more observation: access to aggregate()->rq_weight etc arent
correctly synchronized i.e while a cpu is doing a aggregate_walk_tree()
in a domain, and thus possibly modifying rq_weight, load etc, other cpus could 
be concurrently accessing the same data. As a result, its possible to
see inconsistent rq_weight, load, task_weight combination?

-- 
Regards,
vatsa
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