Re: [PATCH -mmotm 1/5] memcg: disable irq at page cgroup lock

[Andrea Righi <arighi@develer.com>]

On Mon, Mar 15, 2010 at 09:06:38AM +0900, KAMEZAWA Hiroyuki wrote:
> On Mon, 15 Mar 2010 00:26:38 +0100
> Andrea Righi <arighi@develer.com> wrote:
> 
> > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> > 
> > Now, file-mapped is maintaiend. But more generic update function
> > will be needed for dirty page accounting.
> > 
> > For accountig page status, we have to guarantee lock_page_cgroup()
> > will be never called under tree_lock held.
> > To guarantee that, we use trylock at updating status.
> > By this, we do fuzzy accounting, but in almost all case, it's correct.
> > 
> > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> 
> Bad patch title...."use trylock for safe accounting in some contexts" ?

OK, sounds better. I just copy & paste the email subject, but the title
was probably related to the old lock_page_cgroup()+irq_disable patch.

Thanks,
-Andrea