linux-kernel - Re: [PATCH 3/3] mm/memcg: apply add/del

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Date:	Tue, 15 May 2012 13:53:30 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] mm/memcg: apply add/del_page to lruvec

On Tue, 15 May 2012, Konstantin Khlebnikov wrote:
> Hugh Dickins wrote:
> > 
> > I had been hoping to get this stage, where I think we're still in
> > agreement (except perhaps on the ordering of function arguments!),
> > into 3.5 as a basis for later discussion.
> 
> Yeah, my version differs mostly in function's names and ordering of
> arguments.
> I use 'long' for last argument in mem_cgroup_update_lru_size(),
> and call it once in isolate_lru_pages(), rather than for each isolated page.

That sounds very sensible, now that lumpy isn't switching lruvecs:
can be done alongside the similarly deferred __mod_zone_page_state()s.

> You have single mem_cgroup_page_lruvec() variant, and this is biggest
> difference
> between our versions. So, Ok, nothing important at this stage.
> 
> Acked-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>

Thanks a lot, I appreciate you going back to delve in, despite being
put off by appearances earlier.  Yes, I'm only dealing with the trivial
passing down of lruvec instead of zone here, where I felt we'd be sure
to more or less agree.  It seemed the right follow-on to your lruvec
work in vmscan.c, giving us both a good base in 3.5-rc1 on which to
try out our more interesting bits.

Hugh
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