linux-kernel - Re: [PATCH][RFC] slub: increasing order reduces memory usage of some key caches

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]

Message-ID: <19f34abd0807160733q2594bd9fk268703d2aedc8254@mail.gmail.com>
Date:	Wed, 16 Jul 2008 16:33:53 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Christoph Lameter" <cl@...ux-foundation.org>
Cc:	"Richard Kennedy" <richard@....demon.co.uk>,
	penberg@...helsinki.fi, mpm@...enic.com,
	linux-mm <linux-mm@...ck.org>,
	lkml <linux-kernel@...r.kernel.org>, "Mel Gorman" <mel@....ul.ie>
Subject: Re: [PATCH][RFC] slub: increasing order reduces memory usage of some key caches

On Wed, Jul 16, 2008 at 4:03 PM, Christoph Lameter
<cl@...ux-foundation.org> wrote:
> Richard Kennedy wrote:
>
>> before
>> dentry             82136  82137    208   19    1 : tunables    0    0    0 : slabdata   4323   4323      0
>> after
>> dentry             79482  79482    208   39    2 : tunables    0    0    0 : slabdata   2038   2038      0
>
> 19 objects with an order 1 alloc and 208 byte size? Urgh. 8192/208 = 39 and not 19.
>
> Kmemcheck or something else active? We seem to be loosing 50% of our memory.

Hm, I don't think so? I thought that those 1 and 2 were not orders,
but in fact the number of pages. Which seems correct, since now you
have 4096 / 208 = 19 :-)

(His patch bumps order from 0 to 1, so the number of pages were bumped
from 1 to 2.)

Or..?


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
--
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/