linux-kernel - Re: [PATCH] procfs: provide slub's /proc/slabinfo

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: <Pine.LNX.4.64.0801051202480.14866@schroedinger.engr.sgi.com>
Date:	Sat, 5 Jan 2008 12:05:58 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Pekka J Enberg <penberg@...helsinki.fi>
cc:	Matt Mackall <mpm@...enic.com>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hugh@...itas.com>,
	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	zanussi@...ibm.com
Subject: Re: [PATCH] procfs: provide slub's /proc/slabinfo

On Sat, 5 Jan 2008, Pekka J Enberg wrote:

> So, I have this silly memory profiler derived from the kleak patches by 
> the relayfs people and would love to try it out on an embedded workload 
> where SLUB memory footprint is terrible. Any suggestions?

Good idea. But have you tried to look at slabinfo?

Try to run

	slabinfo -t

which will calculate the allocation overhead of the currently allocated 
objects in all slab caches.

One problem: The actual size of kmalloc'ed objects is not available so it 
does not calculate the overhead that comes about because of rounding. Your 
approach would cover that as well but I think we could also add a debug 
mode in which we store the actual size of a kmalloc object and export the 
information via sysfs. Would be nicer than adding this whole additional 
layer.

--
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/