linux-kernel - Re: [PATCH 2/2] cpuset,mm: fix no node to alloc memory when changing cpuset's mems

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Message-Id: <20100511232215.4c8b4318.akpm@linux-foundation.org>
Date:	Tue, 11 May 2010 23:22:15 -0400
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	miaox@...fujitsu.com
Cc:	David Rientjes <rientjes@...gle.com>,
	Nick Piggin <npiggin@...e.de>, Paul Menage <menage@...gle.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH 2/2] cpuset,mm: fix no node to alloc memory when
 changing cpuset's mems

On Wed, 12 May 2010 14:16:42 +0800 Miao Xie <miaox@...fujitsu.com> wrote:

> >>  #include <linux/security.h>
> >>  #include <linux/cpu.h>
> >> +#include <linux/cpuset.h>
> >>  #include <linux/acct.h>
> >>  #include <linux/tsacct_kern.h>
> >>  #include <linux/file.h>
> >> @@ -1003,8 +1004,10 @@ NORET_TYPE void do_exit(long code)
> >>  
> >>  	exit_notify(tsk, group_dead);
> >>  #ifdef CONFIG_NUMA
> >> +	task_lock(tsk);
> >>  	mpol_put(tsk->mempolicy);
> >>  	tsk->mempolicy = NULL;
> >> +	task_unlock(tsk);
> >>  #endif
> >>  #ifdef CONFIG_FUTEX
> >>  	if (unlikely(current->pi_state_cache))
> > 
> > Given that this function is already holding task_lock(tsk), this
> > didn't work very well.
> 
> Sorry for replying late.
> 
> Thanks for your patch that removes task_lock(tsk).
> 
> I made this patch against the mainline tree, and do_exit() in the mainline tree
> doesn't hold task_lock(tsk), so I took task_lock(tsk). But I didn't take notice
> that do_exit() in the mmotm tree had been changed, and I made this mistake.

Ah, hang on.  Yes, I had to manually fix that a lot of times.  The code
you were patching has moved from do_exit() over to exit_mm().  AFACIT
my change is still OK though.  Please carefully review latest -mm?


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