linux-kernel - Re: [PATCH 07/11] Memory compaction core

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <28c262361003231910w27dbe52fqe02afad2b0238c9a@mail.gmail.com>
Date:	Wed, 24 Mar 2010 11:10:14 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 07/11] Memory compaction core

On Wed, Mar 24, 2010 at 10:53 AM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> On Wed, 24 Mar 2010 10:47:41 +0900
> Minchan Kim <minchan.kim@...il.com> wrote:
>
>> On Wed, Mar 24, 2010 at 10:03 AM, KAMEZAWA Hiroyuki
>> <kamezawa.hiroyu@...fujitsu.com> wrote:
>> > On Tue, 23 Mar 2010 12:25:42 +0000
>> > Mel Gorman <mel@....ul.ie> wrote:
>> >
>> >> This patch is the core of a mechanism which compacts memory in a zone by
>> >> relocating movable pages towards the end of the zone.
>> >>
>> >> A single compaction run involves a migration scanner and a free scanner.
>> >> Both scanners operate on pageblock-sized areas in the zone. The migration
>> >> scanner starts at the bottom of the zone and searches for all movable pages
>> >> within each area, isolating them onto a private list called migratelist.
>> >> The free scanner starts at the top of the zone and searches for suitable
>> >> areas and consumes the free pages within making them available for the
>> >> migration scanner. The pages isolated for migration are then migrated to
>> >> the newly isolated free pages.
>> >>
>> >> Signed-off-by: Mel Gorman <mel@....ul.ie>
>> >> Acked-by: Rik van Riel <riel@...hat.com>
>> >> Reviewed-by: Minchan Kim <minchan.kim@...il.com>
>> >
>> > I think lru_add_drain() or lru_add_drain_all() should be called somewhere
>> > when we do __isolate_lru_page(). But it's (_all is) slow....
>> >
>>
>> migrate_prep does it.
>>
> Thanks.
>
> Hmm...then, lru_add_drain_all() is called at each (32page migrate) itelation.
> Isn't it too slow to be called in such frequency ?

I agree. We can move migrate_prep in compact_zone.

>
> Thanks,
> -Kame
>
>
>
>
>



-- 
Kind regards,
Minchan Kim
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/