linux-kernel - Re: [PATCH 0/3] mm: fixup changers of per cpu pageset's ->high and ->batch

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]

Date:	Mon, 08 Apr 2013 12:37:20 -0700
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Simon Jeons <simon.jeons@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] mm: fixup changers of per cpu pageset's ->high and
 ->batch

On 04/06/2013 06:32 PM, Simon Jeons wrote:
> Hi Cody,
> On 04/06/2013 04:33 AM, Cody P Schafer wrote:
>> In one case while modifying the ->high and ->batch fields of per cpu
>> pagesets
>> we're unneededly using stop_machine() (patches 1 & 2), and in another
>> we don't have any
>> syncronization at all (patch 3).
>
> Do you mean stop_machine() is used for syncronization between each
> online cpu?
>

I mean that it looks like synchronization between cpus is unneeded 
because of how per cpu pagesets are used, so stop_machine() (which does 
provide syncro between all cpus) is unnecessarily "strong".

--
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/