linux-kernel - Re: [BUGFIX][PATCH] memcg rcu lock fix v3

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Date:	Sat, 24 Apr 2010 11:08:05 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Li Zefan <lizf@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [BUGFIX][PATCH] memcg rcu lock fix v3

On Fri, 23 Apr 2010 12:34:06 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:

> On Fri, Apr 23, 2010 at 01:03:49PM +0900, KAMEZAWA Hiroyuki wrote:
> > On Fri, 23 Apr 2010 12:58:14 +0900
> > KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> > 
> > > On Fri, 23 Apr 2010 11:55:16 +0800
> > > Li Zefan <lizf@...fujitsu.com> wrote:
> > > 
> > > > Li Zefan wrote:
> > > > > KAMEZAWA Hiroyuki wrote:
> > > > >> On Fri, 23 Apr 2010 11:00:41 +0800
> > > > >> Li Zefan <lizf@...fujitsu.com> wrote:
> > > > >>
> > > > >>> with CONFIG_PROVE_RCU=y, I saw this warning, it's because
> > > > >>> css_id() is not under rcu_read_lock().
> > > > >>>
> > > > >> Ok. Thank you for reporting.
> > > > >> This is ok ? 
> > > > > 
> > > > > Yes, and I did some more simple tests on memcg, no more warning
> > > > > showed up.
> > > > > 
> > > > 
> > > > oops, after trigging oom, I saw 2 more warnings:
> > > > 
> > > 
> > > Thank you for good testing.
> > v3 here...sorry too rapid posting...
> > 
> > ==
> > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> I have queued this, thank you all!
> 
> However, memcg_oom_wake_function() does not yet exist in the tree
> I am using, and is_target_pte_for_mc() has changed.  I omitted the
> hunk for memcg_oom_wake_function() and edited the hunk for
> is_target_pte_for_mc().
> 
Ok, memcg_oom_wake_function is for -mm. I'll prepare another patch for -mm.


> I have queued this for others' testing, but if you would rather carry
> this patch up the memcg path, please let me know and I will drop it.
> 
I think it's ok to be fixed by your tree. I'll look at memcg later and
fix remaining things.

Thanks,
-Kame

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