linux-kernel - Re: [PATCH v3 5/5] slab: make more slab management structure off the 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:	Tue, 14 Jan 2014 21:09:15 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
cc:	Pekka Enberg <penberg@...nel.org>,
	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>
Subject: Re: [PATCH v3 5/5] slab: make more slab management structure off
 the slab

On Mon, 2 Dec 2013, Joonsoo Kim wrote:

> Now, the size of the freelist for the slab management diminish,
> so that the on-slab management structure can waste large space
> if the object of the slab is large.
> 
> Consider a 128 byte sized slab. If on-slab is used, 31 objects can be
> in the slab. The size of the freelist for this case would be 31 bytes
> so that 97 bytes, that is, more than 75% of object size, are wasted.
> 
> In a 64 byte sized slab case, no space is wasted if we use on-slab.
> So set off-slab determining constraint to 128 bytes.
> 
> Acked-by: Christoph Lameter <cl@...ux.com>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: David Rientjes <rientjes@...gle.com>
--
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/