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From: MinChan Kim <minchan.kim@gmail.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	"Rafael J. Wysocki" <rjw@sisk.pl>, Rik van Riel <riel@redhat.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 3/3][RFC] swsusp: shrink file cache first
Date: Fri, 6 Feb 2009 19:06:34 +0900	[thread overview]
Message-ID: <28c262360902060206h78c15a1dsf52b481c5cc1bc74@mail.gmail.com> (raw)
In-Reply-To: <20090206080354.GA6516@barrios-desktop>

On Fri, Feb 6, 2009 at 5:03 PM, MinChan Kim <minchan.kim@gmail.com> wrote:
> Hi, Johannes.
> I have some questions.
> Just out of curiosity. :)
>
> On Fri, Feb 06, 2009 at 04:11:28AM +0100, Johannes Weiner wrote:
>> File cache pages are saved to disk either through normal writeback by
>> reclaim or by including them in the suspend image written to a
>> swapfile.
>>
>> Writing them either way should take the same amount of time but doing
>> normal writeback and unmap changes the fault behaviour on resume from
>> prefault to on-demand paging, smoothening out resume and giving
>
> What do you mean "unmap"?
> Why normal writeback and unmap chnages the fault behavior on resume ?

Please, Ignore poor first my question. :(
I agree with your opinion.

>> previously cached pages the chance to stay out of memory completely if
>> they are not used anymore.
>>
>> Another reason for preferring file page eviction is that the locality
>> principle is visible in fault patterns and swap might perform really
>> bad with subsequent faulting of contiguously mapped pages.
>
> Why do you think that swap might perform bad with subsequent faulting
> of contiguusly mapped page ?
> You mean normal file system is faster than swap due to readahead and
> smart block of allocation ?

But, I still can't understand this issue.
what mean "page eviction" ? Is it reclaim or swap out ?

>
> --
> Kinds Regards
> MinChan Kim
>
>



-- 
Kinds regards,
MinChan Kim

  reply	other threads:[~2009-02-06 10:06 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-02-06  3:11 [PATCH 0/3] [PATCH 0/3] swsusp: shrink file cache first Johannes Weiner
2009-02-06  3:11 ` [PATCH 1/3] swsusp: clean up shrink_all_zones() Johannes Weiner
2009-02-06  3:20   ` KOSAKI Motohiro
2009-02-06  3:11 ` [PATCH 2/3] swsusp: dont fiddle with swappiness Johannes Weiner
2009-02-06  3:21   ` KOSAKI Motohiro
2009-02-06  3:11 ` [PATCH 3/3][RFC] swsusp: shrink file cache first Johannes Weiner
2009-02-06  3:39   ` KOSAKI Motohiro
2009-02-06  4:49     ` Johannes Weiner
2009-02-06  5:59       ` KOSAKI Motohiro
2009-02-06 12:24         ` Johannes Weiner
2009-02-06 13:35           ` MinChan Kim
2009-02-06 17:15             ` MinChan Kim
2009-02-06 23:37               ` Johannes Weiner
2009-02-09 19:43               ` [patch] vmscan: rename sc.may_swap to may_unmap Johannes Weiner
2009-02-09 23:02                 ` MinChan Kim
2009-02-10 10:00                   ` KOSAKI Motohiro
2009-03-27  6:19                 ` [PATCH] vmscan: memcg needs may_swap (Re: [patch] vmscan: rename sc.may_swap to may_unmap) Daisuke Nishimura
2009-03-27  6:30                   ` KAMEZAWA Hiroyuki
2009-03-29 23:45                     ` KOSAKI Motohiro
2009-03-31  0:18                       ` Daisuke Nishimura
2009-03-31  1:26                       ` Minchan Kim
2009-03-31  1:42                         ` KAMEZAWA Hiroyuki
2009-03-31  1:48                           ` KOSAKI Motohiro
2009-04-01  4:09                             ` Johannes Weiner
2009-04-01  5:08                               ` Daisuke Nishimura
2009-04-01  9:04                               ` KAMEZAWA Hiroyuki
2009-04-01  9:11                                 ` KOSAKI Motohiro
2009-04-01  9:49                                 ` Johannes Weiner
2009-04-01  9:55                                   ` KOSAKI Motohiro
2009-04-01 16:03                                     ` Johannes Weiner
2009-03-31  1:52                         ` Daisuke Nishimura
2009-02-06 21:00       ` [PATCH 3/3][RFC] swsusp: shrink file cache first Andrew Morton
2009-02-06 23:27         ` Johannes Weiner
2009-02-07 17:23           ` Rafael J. Wysocki
2009-02-08 20:56             ` Johannes Weiner
2009-02-07  4:41         ` Nigel Cunningham
2009-02-07 16:51         ` KOSAKI Motohiro
2009-02-07 21:20           ` Nigel Cunningham
2009-02-27 13:27         ` Pavel Machek
2009-03-01 10:37           ` KOSAKI Motohiro
2009-02-06  8:03   ` MinChan Kim
2009-02-06 10:06     ` MinChan Kim [this message]
2009-02-06 11:50       ` Johannes Weiner

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