linux-kernel - Re: [PATCH 2/12] memcg move charege() call to swapped-in page under lock

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <48DC9EF2.10004@linux.vnet.ibm.com>
Date:	Fri, 26 Sep 2008 14:06:02 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"xemul@...nvz.org" <xemul@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Hansen <haveblue@...ibm.com>, ryov@...inux.co.jp
Subject: Re: [PATCH 2/12] memcg move charege() call to swapped-in page under
 lock_page()

KAMEZAWA Hiroyuki wrote:
> While page-cache's charge/uncharge is done under page_lock(), swap-cache
> isn't. (anonymous page is charged when it's newly allocated.)
> 
> This patch moves do_swap_page()'s charge() call under lock. This helps
> us to avoid to charge already mapped one, unnecessary calls.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Seems reasonable to me

Just one quick comment though, as a result of this change, mark_page_accessed is
now called with PageLock held, I suspect you would want to move that call prior
to lock_page().



-- 
	Balbir
--
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/