linux-kernel - Re: [MM] Make mm counters per cpu instead of atomic

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Message-Id: <1258591687.11321.42.camel@localhost>
Date:	Thu, 19 Nov 2009 08:48:07 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, Tejun Heo <tj@...nel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [MM] Make mm counters per cpu instead of atomic

On Tue, 2009-11-17 at 12:25 -0500, Christoph Lameter wrote:
> On Tue, 17 Nov 2009, Zhang, Yanmin wrote:
> 
> > The right change above should be:
> >  struct mm_counter *m = per_cpu_ptr(mm->rss, cpu);
> 
> Right.
> 
> > With the change, command 'make oldconfig' and a boot command still
> > hangs.
> 
> Not sure if its worth spending more time on this but if you want I will
> consolidate the fixes so far and put out another patchset.
> 
> Where does it hang during boot?
> 
1) A init boot script calss pidof and pidof hands in
access_process_vm => (mutex_lock <=> mutex_unlock), so actually in
mm_reader_lock.
2) 'make oldconfig' hangs in sys_map => msleep, actually in mm_writer_lock.

I will check it today.



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