linux-kernel - Re: [RFC PATCH 0/3] Do not wait the full timeout on congestion

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Date:	Fri, 27 Aug 2010 10:41:48 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Mel Gorman <mel@....ul.ie>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>, Jan Kara <jack@...e.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Li Shaohua <shaohua.li@...el.com>
Subject: Re: [RFC PATCH 0/3] Do not wait the full timeout on congestion_wait
 when there is no congestion

Hi, Wu.

On Fri, Aug 27, 2010 at 10:21 AM, Wu Fengguang <fengguang.wu@...el.com> wrote:
> Minchan,
>
> It's much cleaner to keep the unchanged congestion_wait() and add a
> congestion_wait_check() for converting problematic wait sites. The
> too_many_isolated() wait is merely a protective mechanism, I won't
> bother to improve it at the cost of more code.

You means following as?

        while (unlikely(too_many_isolated(zone, file, sc))) {
                congestion_wait_check(BLK_RW_ASYNC, HZ/10);

                /* We are about to die and free our memory. Return now. */
                if (fatal_signal_pending(current))
                        return SWAP_CLUSTER_MAX;
        }


>
> Thanks,
> Fengguang
>

-- 
Kind regards,
Minchan Kim
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