linux-kernel - Re: [patch 8/8] mm: make per-memcg lru lists exclusive

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: <20110602142408.GB28684@cmpxchg.org>
Date:	Thu, 2 Jun 2011 16:24:08 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Ying Han <yinghan@...gle.com>, Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 8/8] mm: make per-memcg lru lists exclusive

On Thu, Jun 02, 2011 at 10:16:59PM +0900, Hiroyuki Kamezawa wrote:
> 2011/6/1 Johannes Weiner <hannes@...xchg.org>:
> > All lru list walkers have been converted to operate on per-memcg
> > lists, the global per-zone lists are no longer required.
> >
> > This patch makes the per-memcg lists exclusive and removes the global
> > lists from memcg-enabled kernels.
> >
> > The per-memcg lists now string up page descriptors directly, which
> > unifies/simplifies the list isolation code of page reclaim as well as
> > it saves a full double-linked list head for each page in the system.
> >
> > At the core of this change is the introduction of the lruvec
> > structure, an array of all lru list heads.  It exists for each zone
> > globally, and for each zone per memcg.  All lru list operations are
> > now done in generic code against lruvecs, with the memcg lru list
> > primitives only doing accounting and returning the proper lruvec for
> > the currently scanned memcg on isolation, or for the respective page
> > on putback.
> >
> > Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> 
> 
> could you divide this into
>   - introduce lruvec
>   - don't record section? information into pc->flags because we see
> "page" on memcg LRU
>     and there is no requirement to get page from "pc".
>   - remove pc->lru completely

Yes, that makes sense.  It shall be fixed in the next version.
--
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/