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Date: Thu, 9 Dec 2010 14:13:17 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Minchan Kim <minchan.kim@gmail.com>
Cc: linux-mm <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>,
        Shaohua Li <shaohua.li@intel.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Mel Gorman <mel@csn.ul.ie>
Subject: Re: [PATCH] vmscan: make kswapd use a correct order
Message-Id: <20101209141317.60d14fb5.akpm@linux-foundation.org>
In-Reply-To: <1291305649-2405-1-git-send-email-minchan.kim@gmail.com>
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On Fri,  3 Dec 2010 01:00:49 +0900
Minchan Kim <minchan.kim@gmail.com> wrote:

> +static bool kswapd_try_to_sleep(pg_data_t *pgdat, int order)

OT: kswapd_try_to_sleep() does a
trace_mm_vmscan_kswapd_sleep(pgdat->node_id) if it sleeps for a long
time, but doesn't trace anything at all if it does a short sleep. 
Where's the sense in that?