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

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From: Christoph Lameter <clameter@...>
To: Pekka J Enberg <penberg@...>
Cc: Matt Mackall <mpm@...>, Ingo Molnar <mingo@...>, Linus Torvalds <torvalds@...>, Hugh Dickins <hugh@...>, Andi Kleen <andi@...>, Peter Zijlstra <a.p.zijlstra@...>, Linux Kernel Mailing List <linux-kernel@...>, <zanussi@...>
Subject: Re: [PATCH] procfs: provide slub's /proc/slabinfo
Date: Saturday, January 5, 2008 - 4:05 pm

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


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.

--
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Messages in current thread:
[PATCH] procfs: provide slub's /proc/slabinfo, Hugh Dickins, (Wed Jan 2, 2:43 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Pekka Enberg, (Wed Jan 2, 3:09 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Linus Torvalds, (Wed Jan 2, 3:35 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Matt Mackall, (Wed Jan 2, 6:50 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Ingo Molnar, (Thu Jan 3, 4:52 am)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Christoph Lameter, (Thu Jan 3, 4:31 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Matt Mackall, (Thu Jan 3, 12:46 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Christoph Lameter, (Thu Jan 3, 10:21 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Matt Mackall, (Fri Jan 4, 12:11 am)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Pekka J Enberg, (Sat Jan 5, 12:21 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Matt Mackall, (Sun Jan 6, 1:51 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Pekka J Enberg, (Mon Jan 7, 2:06 pm)
[RFC PATCH] greatly reduce SLOB external fragmentation, Matt Mackall, (Wed Jan 9, 3:15 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Pekka J Enberg, (Thu Jan 10, 6:03 am)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Pekka J Enberg, (Wed Jan 9, 6:43 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Matt Mackall, (Wed Jan 9, 10:46 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Matt Mackall, (Wed Jan 9, 6:59 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Pekka J Enberg, (Thu Jan 10, 6:02 am)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Pekka J Enberg, (Thu Jan 10, 6:54 am)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Linus Torvalds, (Thu Jan 10, 12:13 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Pekka J Enberg, (Wed Jul 30, 5:51 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Linus Torvalds, (Wed Jul 30, 6:00 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Matt Mackall, (Wed Jul 30, 9:09 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Christoph Lameter, (Thu Jul 31, 10:26 am)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Matt Mackall, (Thu Jul 31, 11:38 am)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Christoph Lameter, (Thu Jul 31, 11:42 am)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Andi Kleen, (Thu Jul 31, 10:11 am)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Christoph Lameter, (Thu Jul 31, 11:25 am)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Andi Kleen, (Thu Jul 31, 12:03 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Christoph Lameter, (Thu Jul 31, 12:05 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Pekka Enberg, (Wed Jul 30, 6:22 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Linus Torvalds, (Wed Jul 30, 6:35 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Matt Mackall, (Wed Jul 30, 9:03 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Andi Kleen, (Thu Jan 10, 2:13 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Matt Mackall, (Thu Jan 10, 1:49 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Jörn, (Thu Jan 10, 5:25 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Christoph Lameter, (Thu Jan 10, 3:16 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Matt Mackall, (Thu Jan 10, 3:23 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Christoph Lameter, (Thu Jan 10, 3:31 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Linus Torvalds, (Thu Jan 10, 2:28 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Matt Mackall, (Thu Jan 10, 2:42 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Linus Torvalds, (Thu Jan 10, 3:41 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Andi Kleen, (Thu Jan 10, 3:53 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Christoph Lameter, (Thu Jan 10, 3:52 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Christoph Lameter, (Thu Jan 10, 3:46 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Christoph Lameter, (Thu Jan 10, 3:24 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Matt Mackall, (Thu Jan 10, 3:44 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Christoph Lameter, (Thu Jan 10, 3:51 pm)
Re: [RFC PATCH] greatly reduce SLOB external fragmentation, Matt Mackall, (Thu Jan 10, 11:44 am)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Matt Mackall, (Mon Jan 7, 3:03 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Pekka J Enberg, (Thu Jan 10, 6:04 am)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Pekka J Enberg, (Mon Jan 7, 4:44 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Pekka J Enberg, (Mon Jan 7, 3:53 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Christoph Lameter, (Sat Jan 5, 4:05 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Pekka J Enberg, (Mon Jan 7, 4:12 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Andi Kleen, (Sat Jan 5, 1:14 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Christoph Lameter, (Fri Jan 4, 4:34 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Matt Mackall, (Fri Jan 4, 4:55 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Christoph Lameter, (Fri Jan 4, 5:36 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Matt Mackall, (Fri Jan 4, 6:30 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Christoph Lameter, (Sat Jan 5, 4:16 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Andi Kleen, (Thu Jan 3, 10:45 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Peter Zijlstra, (Fri Jan 4, 5:17 am)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Christoph Lameter, (Fri Jan 4, 4:37 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Matt Mackall, (Fri Jan 4, 12:34 am)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Pekka Enberg, (Wed Jan 2, 3:49 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Linus Torvalds, (Wed Jan 2, 3:45 pm)
Re: [PATCH] procfs: provide slub's /proc/slabinfo, Christoph Lameter, (Wed Jan 2, 2:53 pm)