linux-kernel - Re: [PATCH 2/6] change alloc function in pcpu_alloc

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:	Thu, 22 Apr 2010 02:06:22 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Mel Gorman <mel@....ul.ie>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Bob Liu <lliubbo@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 2/6] change alloc function in pcpu_alloc_pages

On Wed, Apr 21, 2010 at 11:15 PM, Christoph Lameter
<cl@...ux-foundation.org> wrote:
> On Tue, 20 Apr 2010, Mel Gorman wrote:
>
>> alloc_pages_exact_node() avoids a branch in a hot path that is checking for
>> something the caller already knows. That's the reason it exists.
>
> We can avoid alloc_pages_exact_node() by making all callers of
> alloc_pages_node() never use -1. -1 is ambiguous and only rarely will a
> caller pass that to alloc_pages_node().

That's very reasonable to me.
Then, we can remove alloc_pages_exact_node and nid < 0 check in
alloc_pages_node at the same time.

Mel. Could you agree?

Firstly Tejun suggested this but I didn't got the point.
Sorry for bothering you.

Okay. I will dive into this approach.
Thanks for careful review, All.


> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@...ck.org.  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@...ck.org"> email@...ck.org </a>
>



-- 
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/