linux-kernel - Re: [PATCH v3 05/10] vmscan: make isolate_lru

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Message-ID: <20110609140453.GX5247@suse.de>
Date:	Thu, 9 Jun 2011 15:04:53 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH v3 05/10] vmscan: make isolate_lru_page with filter aware

On Tue, Jun 07, 2011 at 11:38:18PM +0900, Minchan Kim wrote:
> In __zone_reclaim case, we don't want to shrink mapped page.
> Nonetheless, we have isolated mapped page and re-add it into
> LRU's head. It's unnecessary CPU overhead and makes LRU churning.
> 

Gack, I should have keep reading. I didn't cop from the subject that
__zone_reclaim would be updated. Still, it would have been easier to
review if one patch introduced ISOLATE_CLEAN and updated the callers and
this patch introduced ISOLATE_UNMAPPED and updated the relevant callers.

> <SNIP>

-- 
Mel Gorman
SUSE Labs
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