linux-kernel - Re: [patch 05/26] Slab allocators: Cleanup zeroing allocations

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:	Wed, 20 Jun 2007 09:14:43 +0300 (EEST)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	Christoph Lameter <clameter@....com>
cc:	Matt Mackall <mpm@...enic.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	suresh.b.siddha@...el.com
Subject: Re: [patch 05/26] Slab allocators: Cleanup zeroing allocations

On Tue, 19 Jun 2007, Matt Mackall wrote:
> > I worry a bit about adding another branch checking __GFP_ZERO in such
> > a hot path for SLAB/SLUB.

On Tue, 19 Jun 2007, Christoph Lameter wrote:
> Its checking the gfpflags variable on the stack. In a recently touched 
> cachline.

The variable could be in a register too but it's the _branch 
instruction_ that is bit worrisome especially for embedded devices (think 
slob). I haven't measured this, so consider this as pure speculation and 
hand-waving from my part.
-
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/