linux-kernel - Re: [RFC 4/8] Make clear description of putback_lru

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Message-ID: <20110428084500.GG12437@cmpxchg.org>
Date:	Thu, 28 Apr 2011 10:45:00 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux.com>,
	Johannes Weiner <jweiner@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [RFC 4/8] Make clear description of putback_lru_page

On Thu, Apr 28, 2011 at 08:20:32AM +0900, Minchan Kim wrote:
> On Wed, Apr 27, 2011 at 5:11 PM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> > On Wed, 27 Apr 2011 01:25:21 +0900
> > Minchan Kim <minchan.kim@...il.com> wrote:
> >
> >> Commonly, putback_lru_page is used with isolated_lru_page.
> >> The isolated_lru_page picks the page in middle of LRU and
> >> putback_lru_page insert the lru in head of LRU.
> >> It means it could make LRU churning so we have to be very careful.
> >> Let's clear description of putback_lru_page.
> >>
> >> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> >> Cc: Mel Gorman <mgorman@...e.de>
> >> Cc: Rik van Riel <riel@...hat.com>
> >> Cc: Andrea Arcangeli <aarcange@...hat.com>
> >> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> >
> > seems good...
> > Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> >
> > But is there consensus which side of LRU is tail? head?
> 
> I don't know. I used to think it's head.
> If other guys raise a concern as well, let's talk about it. :)
> Thanks

I suppose we add new pages to the head of the LRU and reclaim old
pages from the tail.

Acked-by: Johannes Weiner <hannes@...xchg.org>
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