linux-kernel - Re: [PATCH] vmscan: make kswapd use a correct order

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Message-ID: <AANLkTikxRpiRdXpxgAJWaOhhA32Fup97DLYA9gNUS5TP@mail.gmail.com>
Date:	Fri, 10 Dec 2010 12:53:39 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Shaohua Li <shaohua.li@...el.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH] vmscan: make kswapd use a correct order

On Fri, Dec 10, 2010 at 7:13 AM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Fri,  3 Dec 2010 01:00:49 +0900
> Minchan Kim <minchan.kim@...il.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?
>

AFAIU, short sleep is _sleep_ but that trace's goal is to count only long sleep.
In addition, short sleep is a just ready to go or not long sleep so I
think we don't need short sleep trace.
And for knowing short sleep count, we can use
KSWAPD_{LOW|HIGH}_WMARK_HIT_QUICKLY.

-- 
Kind regards,
Minchan Kim
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