linux-kernel - Re: [PATCH 05/16] slab: remove cachep in struct slab

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:	Fri, 23 Aug 2013 13:42:59 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
cc:	Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/16] slab: remove cachep in struct slab_rcu

On Fri, 23 Aug 2013, Joonsoo Kim wrote:

> On Thu, Aug 22, 2013 at 05:53:00PM +0000, Christoph Lameter wrote:
> > On Thu, 22 Aug 2013, Joonsoo Kim wrote:
> >
> > > We can get cachep using page in struct slab_rcu, so remove it.
> >
> > Ok but this means that we need to touch struct page. Additional cacheline
> > in cache footprint.
>
> In following patch, we overload RCU_HEAD to LRU of struct page and
> also overload struct slab to struct page. So there is no
> additional cacheline footprint at final stage.

If you do not use rcu (standard case) then you have an additional
cacheline.

--
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/