linux-kernel - Re: [RFC 5/8] compaction: remove active list counting

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Message-ID: <20110428090238.GK12437@cmpxchg.org>
Date:	Thu, 28 Apr 2011 11:02:38 +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 5/8] compaction: remove active list counting

On Thu, Apr 28, 2011 at 08:42:28AM +0900, Minchan Kim wrote:
> On Wed, Apr 27, 2011 at 5:15 PM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> > On Wed, 27 Apr 2011 01:25:22 +0900
> > Minchan Kim <minchan.kim@...il.com> wrote:
> >
> >> acct_isolated of compaction uses page_lru_base_type which returns only
> >> base type of LRU list so it never returns LRU_ACTIVE_ANON or LRU_ACTIVE_FILE.
> >> So it's pointless to add lru[LRU_ACTIVE_[ANON|FILE]] to get sum.
> >>
> >> 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>
> >
> > I think some comments are necessary to explain why INACTIVE only.
> 
> As alternative, I can change page_lru_base_type with page_lru.
> It's not hot path so I will do.

We immediately use those numbers to account
NR_ISOLATED_ANON/NR_ISOLATED_FILE - i.e. 'lru base types', so I think
using page_lru_base_type() makes perfect sense.
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