linux-kernel - Re: [PATCH 1/3] slub: correct to calculate num of acquired objects in get_partial

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, 16 Jan 2013 15:04:23 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
cc:	Pekka Enberg <penberg@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] slub: correct to calculate num of acquired objects
 in get_partial_node()

On Wed, 16 Jan 2013, Joonsoo Kim wrote:

> In acquire_slab() with mode = 1, we always set new.inuse = page->objects.

Yes with that we signal that we have extracted the objects from the slab.

> So
>
> 		acquire_slab(s, n, page, object == NULL);
>
>                 if (!object) {
>                         c->page = page;
>                         stat(s, ALLOC_FROM_PARTIAL);
>                         object = t;
>                         available =  page->objects - page->inuse;
>
> 			!!!!!! available is always 0 !!!!!!

Correct. We should really count the objects that we extracted in
acquire_slab(). Please update the description to the patch and repost.

Also it would be nice if we had some way to avoid passing a pointer to an
integer to acquire_slab. If we cannot avoid that then ok but it would be
nicer without that.

--
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/