From: Rik van Riel <riel@redhat.com>
To: Minchan Kim <minchan.kim@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Venkatesh Pallipadi <venki@google.com>,
Ying Han <yinghan@google.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH] vmscan: prevent background aging of anon page in no swap system
Date: Sun, 29 Aug 2010 11:49:07 -0400 [thread overview]
Message-ID: <4C7A8173.5060306@redhat.com> (raw)
In-Reply-To: <1283096628-4450-1-git-send-email-minchan.kim@gmail.com>
On 08/29/2010 11:43 AM, Minchan Kim wrote:
> This patch prevents unnecessary anon pages demotion in not-swapon and
> non-configured swap system. Of course, it could make side effect that
> hot anon pages could swap out when admin does swap on.
> But I think sooner or later it would be steady state.
> So it's not a big problem.
> We could lose someting but gain more thing(TLB flush and unnecessary
> function call to demote anon pages).
A agree that is not a big worry. I expect virtually all the
systems with swap space will do swapon at boot time.
> I used total_swap_pages because we want to age anon pages
> even though swap full happens.
>
> Cc: Rik van Riel<riel@redhat.com>
> Cc: KOSAKI Motohiro<kosaki.motohiro@jp.fujitsu.com>
> Cc: Johannes Weiner<hannes@cmpxchg.org>
> Reported-by: Ying Han<yinghan@google.com>
> Signed-off-by: Minchan Kim<minchan.kim@gmail.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
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next prev parent reply other threads:[~2010-08-29 15:49 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-29 15:43 [PATCH] vmscan: prevent background aging of anon page in no swap system Minchan Kim
2010-08-29 15:49 ` Rik van Riel [this message]
2010-08-29 17:45 ` Ying Han
2010-08-29 20:03 ` Rik van Riel
2010-08-29 20:56 ` Ying Han
2010-08-29 21:23 ` Ying Han
2010-08-29 22:26 ` Rik van Riel
2010-08-30 0:18 ` Minchan Kim
2010-08-30 5:40 ` Ying Han
2010-08-30 6:16 ` Minchan Kim
2010-08-31 0:56 ` KOSAKI Motohiro
2010-08-31 1:10 ` Minchan Kim
2010-08-31 1:18 ` KOSAKI Motohiro
2010-08-31 1:36 ` Minchan Kim
2010-08-31 1:41 ` KOSAKI Motohiro
2010-08-31 0:56 ` KOSAKI Motohiro
2010-08-31 1:23 ` Minchan Kim
2010-08-31 1:38 ` KOSAKI Motohiro
2010-08-31 2:02 ` Minchan Kim
2010-08-31 2:09 ` KOSAKI Motohiro
2010-08-31 3:47 ` Minchan Kim
2010-08-31 2:30 ` Rik van Riel
2010-08-31 3:46 ` Minchan Kim
2010-09-03 21:06 ` Andrew Morton
2010-09-03 21:23 ` Rik van Riel
2010-09-03 21:45 ` Ying Han
2010-09-03 21:47 ` Ying Han
2010-09-03 21:56 ` Andrew Morton
2010-09-04 1:12 ` Venkatesh Pallipadi
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