linux-kernel - Re: [PATCH v5 09/11] thp: lazy huge zero page allocation

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] [day] [month] [year] [list]

Date:	Thu, 13 Dec 2012 00:05:05 +0200
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill@...temov.name>
Subject: Re: [PATCH v5 09/11] thp: lazy huge zero page allocation

On Wed, Dec 12, 2012 at 01:48:04PM -0800, H. Peter Anvin wrote:
> On 12/12/2012 01:30 PM, Andrew Morton wrote:
> >>
> >> I can rewrite the check to static_key if you want. Would it be better?
> > 
> > The new test-n-branch only happens on the first read fault against a
> > thp huge page, yes?  In which case it's a quite infrequent event and I
> > suspect this isn't worth bothering about.
> > 
> 
> Not to mention that flipping the static key is *incredibly* expensive.

I'm fine with current code.

-- 
 Kirill A. Shutemov

Download attachment "signature.asc" of type "application/pgp-signature" (837 bytes)