From: Christoph Lameter <cl@linux-foundation.org>
To: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: penberg@cs.helsinki.fi, mpm@selenic.com,
linux-mm <linux-mm@kvack.org>,
lkml <linux-kernel@vger.kernel.org>, Mel Gorman <mel@csn.ul.ie>
Subject: Re: [PATCH][RFC] slub: increasing order reduces memory usage of some key caches
Date: Fri, 18 Jul 2008 09:17:55 -0500 [thread overview]
Message-ID: <4880A613.1060002@linux-foundation.org> (raw)
In-Reply-To: <1216375025.3082.7.camel@castor.localdomain>
Richard Kennedy wrote:
> Slabcache: dentry Aliases: 0 Order : 0 Objects: 22553
> ** Reclaim accounting active
>
> Sizes (bytes) Slabs Debug Memory
> ------------------------------------------------------------------------
> Object : 208 Total : 1188 Sanity Checks : Off Total: 4866048
> SlabObj: 208 Full : 1186 Redzoning : Off Used : 4691024
> SlabSiz: 4096 Partial: 0 Poisoning : Off Loss : 175024
> Loss : 0 CpuSlab: 2 Tracking : Off Lalig: 0
> Align : 8 Objects: 19 Tracing : Off Lpadd: 171072
So we are using 1188 pages before make
> and after a make kernel & a small delay
2399 pages after make
> on 2.6.26 + my patch
579 * 2 = 1158 (saved 30 pages even before doing anything) before make
> after the make
2025 *2 = 4050 pages which are much more than the 2399 with order 0.
So we are wasting a lot more space. You'd probably need to run slab defrag to get that memory back.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2008-07-18 14:17 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-16 12:29 Richard Kennedy
2008-07-16 13:21 ` Christoph Lameter
2008-07-16 13:58 ` Richard Kennedy
2008-07-16 14:03 ` Christoph Lameter
2008-07-16 14:30 ` Richard Kennedy
2008-07-16 14:33 ` Vegard Nossum
2008-07-16 14:46 ` Christoph Lameter
2008-07-18 9:57 ` Richard Kennedy
2008-07-18 14:17 ` Christoph Lameter [this message]
2008-07-18 14:20 ` Christoph Lameter
2008-07-18 14:42 ` Richard Kennedy
2008-07-18 14:55 ` Christoph Lameter
2008-07-18 15:22 ` Richard Kennedy
2008-07-18 17:13 ` Christoph Lameter
2008-07-16 19:52 ` Mel Gorman
2008-07-17 9:48 ` Richard Kennedy
2008-07-16 15:52 ` Christoph Lameter
2008-07-16 15:59 ` Christoph Lameter
2008-07-17 10:09 ` Richard Kennedy
2008-07-17 16:56 ` Christoph Lameter
2008-07-18 10:17 ` Richard Kennedy
2008-07-18 14:21 ` Christoph Lameter
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4880A613.1060002@linux-foundation.org \
--to=cl@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mel@csn.ul.ie \
--cc=mpm@selenic.com \
--cc=penberg@cs.helsinki.fi \
--cc=richard@rsk.demon.co.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox