linux-kernel - Re: [RFC 3/4] mm: support remove

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Date:	Tue, 14 May 2013 16:17:18 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [RFC 3/4] mm: support remove_mapping in irqcontext

Hey Michal,

On Mon, May 13, 2013 at 04:58:57PM +0200, Michal Hocko wrote:
> On Mon 13-05-13 11:10:47, Minchan Kim wrote:
> [...]
> > My rough plan is following as,
> > 
> > 1. Make mctz->lock beging aware of irq by changing spin_lock with
> >    spin_lock_irqsave.
> 
> I wouldn't be worried about this one as it is on its way out with the
> soft limit rework (the core uncontroversial part ;))

Good to hear!

> 
> > 2. Introuduce new argument "locked" in __mem_cgroup_uncharge_common
> >    so that __mem_cgroup_uncharge_common can avoid lock_page_cgroup in
> >    irqcontext to avoid deadlock but caller in irqcontext should be held
> >    it in advance by next patch.
> > 3. Introduce try_lock_page_cgroup, which will be used __swapcache_free.
> > 4. __remove_mapping can held a page_cgroup lock in advance before calling
> >    __swapcache_free
> > 
> > I'd like to listen memcg people's opinions before diving into coding.
> 
> It should work. It will require some code moving, though.

Yeb. I will give it a shot!

Thanks for the review!

-- 
Kind regards,
Minchan Kim
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