linux-kernel - Re: [RFC][PATCH] Remove cgroup member from struct page

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: <20080901113918.b6f05ca6.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 1 Sep 2008 11:39:18 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	Andrew Morton <akpm@...ux-foundation.org>, hugh@...itas.com,
	menage@...gle.com, xemul@...nvz.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [RFC][PATCH] Remove cgroup member from struct page

On Sun, 31 Aug 2008 23:17:56 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> 
> This is a rewrite of a patch I had written long back to remove struct page
> (I shared the patches with Kamezawa, but never posted them anywhere else).
> I spent the weekend, cleaning them up for 2.6.27-rc5-mmotm (29 Aug 2008).
> 
> I've tested the patches on an x86_64 box, I've run a simple test running
> under the memory control group and the same test running concurrently under
> two different groups (and creating pressure within their groups). I've also
> compiled the patch with CGROUP_MEM_RES_CTLR turned off.
> 
> Advantages of the patch
> 
> 1. It removes the extra pointer in struct page
> 
> Disadvantages
> 
> 1. It adds an additional lock structure to struct page_cgroup
> 2. Radix tree lookup is not an O(1) operation, once the page is known
>    getting to the page_cgroup (pc) is a little more expensive now.
> 
> This is an initial RFC for comments
> 
> TODOs
> 
> 1. Test the page migration changes
> 2. Test the performance impact of the patch/approach
> 
> Comments/Reviews?
> 
BTW, how deep this radix-tree on 4GB/32GB/64GB/256GB machine ?

Thanks,
-Kame

--
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/