From: Christoph Lameter <clameter@sgi.com>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
netdev@vger.kernel.org,
Trond Myklebust <trond.myklebust@fys.uio.no>,
Thomas Graf <tgraf@suug.ch>, David Miller <davem@davemloft.net>,
James Bottomley <James.Bottomley@SteelEye.com>,
Mike Christie <michaelc@cs.wisc.edu>,
Andrew Morton <akpm@linux-foundation.org>,
Daniel Phillips <phillips@google.com>
Subject: Re: [PATCH 08/40] mm: kmem_cache_objsize
Date: Fri, 4 May 2007 12:59:44 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0705041258390.25267@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <463B815E.8010806@cs.helsinki.fi>
On Fri, 4 May 2007, Pekka Enberg wrote:
> Christoph Lameter wrote:
> > On Fri, 4 May 2007, Pekka Enberg wrote:
> >
> > > Again, slab has no way of actually estimating how many pages you need for
> > > a
> > > given number of objects. So we end up calculating some upper bound which
> > > doesn't belong in mm/slab.c. I am perfectly okay with:
> >
> > It can give a worst case number and that is what he wants.
>
> Sure. But he can calculate that elsewhere instead of bringing it in mm/slab.c
> where it's no use for anyone else...
He is not able to calculate it just using the object size since he does
not know where the slab put the slab management structure. And in case of
SLUB there is no slab management structure... Which means he would have to
special case based on the slab allocator selected.
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next prev parent reply other threads:[~2007-05-04 19:59 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-04 10:26 [PATCH 00/40] Swap over Networked storage -v12 Peter Zijlstra
2007-05-04 10:26 ` [PATCH 01/40] mm: page allocation rank Peter Zijlstra
2007-05-04 10:26 ` [PATCH 02/40] mm: slab allocation fairness Peter Zijlstra
2007-05-16 20:41 ` Christoph Lameter
2007-05-04 10:26 ` [PATCH 03/40] mm: allow PF_MEMALLOC from softirq context Peter Zijlstra
2007-05-04 10:26 ` [PATCH 04/40] mm: serialize access to min_free_kbytes Peter Zijlstra
2007-05-04 10:26 ` [PATCH 05/40] mm: emergency pool Peter Zijlstra
2007-05-04 10:26 ` [PATCH 06/40] mm: __GFP_EMERGENCY Peter Zijlstra
2007-05-04 10:26 ` [PATCH 07/40] mm: allow mempool to fall back to memalloc reserves Peter Zijlstra
2007-05-04 10:26 ` [PATCH 08/40] mm: kmem_cache_objsize Peter Zijlstra
2007-05-04 10:54 ` Pekka Enberg
2007-05-04 16:09 ` Christoph Lameter
2007-05-04 16:15 ` Peter Zijlstra
2007-05-04 16:23 ` Christoph Lameter
2007-05-04 16:30 ` Peter Zijlstra
2007-05-04 16:36 ` Christoph Lameter
2007-05-04 17:59 ` Peter Zijlstra
2007-05-04 18:04 ` Christoph Lameter
2007-05-04 18:21 ` Peter Zijlstra
2007-05-04 18:30 ` Christoph Lameter
2007-05-04 18:32 ` Peter Zijlstra
2007-05-04 18:45 ` Pekka Enberg
2007-05-04 18:47 ` Christoph Lameter
2007-05-04 18:54 ` Pekka Enberg
2007-05-04 19:59 ` Christoph Lameter [this message]
2007-05-05 9:00 ` Pekka J Enberg
2007-05-04 18:41 ` Pekka Enberg
2007-05-04 18:46 ` Christoph Lameter
2007-05-04 18:53 ` Pekka Enberg
2007-05-04 19:58 ` Christoph Lameter
2007-05-04 10:27 ` [PATCH 09/40] mm: optimize gfp_to_rank() Peter Zijlstra
2007-05-04 10:27 ` [PATCH 10/40] selinux: tag avc cache alloc as non-critical Peter Zijlstra
2007-05-04 10:27 ` [PATCH 11/40] net: wrap sk->sk_backlog_rcv() Peter Zijlstra
2007-05-04 10:27 ` [PATCH 12/40] net: packet split receive api Peter Zijlstra
2007-05-04 10:27 ` [PATCH 13/40] net: sk_allocation() - concentrate socket related allocations Peter Zijlstra
2007-05-04 10:27 ` [PATCH 14/40] netvm: link network to vm layer Peter Zijlstra
2007-05-04 10:27 ` [PATCH 15/40] netvm: INET reserves Peter Zijlstra
2007-05-04 10:27 ` [PATCH 16/40] netvm: hook skb allocation to reserves Peter Zijlstra
2007-05-04 14:07 ` Arnaldo Carvalho de Melo
2007-05-04 10:27 ` [PATCH 17/40] netvm: filter emergency skbs Peter Zijlstra
2007-05-04 10:27 ` [PATCH 18/40] netvm: prevent a TCP specific deadlock Peter Zijlstra
2007-05-04 10:27 ` [PATCH 19/40] netfilter: notify about NF_QUEUE vs emergency skbs Peter Zijlstra
2007-05-04 10:27 ` [PATCH 20/40] netvm: skb processing Peter Zijlstra
2007-05-04 10:27 ` [PATCH 21/40] uml: rename arch/um remove_mapping() Peter Zijlstra
2007-05-04 10:27 ` [PATCH 22/40] mm: prepare swap entry methods for use in page methods Peter Zijlstra
2007-05-04 10:27 ` [PATCH 23/40] mm: add support for non block device backed swap files Peter Zijlstra
2007-05-04 10:27 ` [PATCH 24/40] mm: methods for teaching filesystems about PG_swapcache pages Peter Zijlstra
2007-05-04 10:27 ` [PATCH 25/40] nfs: remove mempools Peter Zijlstra
2007-05-04 10:27 ` [PATCH 26/40] nfs: teach the NFS client how to treat PG_swapcache pages Peter Zijlstra
2007-05-04 10:27 ` [PATCH 27/40] nfs: disable data cache revalidation for swapfiles Peter Zijlstra
2007-05-04 10:27 ` [PATCH 28/40] nfs: enable swap on NFS Peter Zijlstra
2007-05-04 10:27 ` [PATCH 29/40] nfs: fix various memory recursions possible with swap over NFS Peter Zijlstra
2007-05-04 10:27 ` [PATCH 30/40] nfs: fixup missing error code Peter Zijlstra
2007-05-04 13:10 ` Peter Staubach
2007-05-04 13:18 ` Peter Zijlstra
2007-05-04 10:27 ` [PATCH 31/40] mm: balance_dirty_pages() vs throttle_vm_writeout() deadlock Peter Zijlstra
2007-05-04 10:27 ` [PATCH 32/40] block: add a swapdev callback to the request_queue Peter Zijlstra
2007-05-04 10:27 ` [PATCH 33/40] uml: enable scsi and add iscsi config Peter Zijlstra
2007-05-04 10:27 ` [PATCH 34/40] sock: safely expose kernel sockets to userspace Peter Zijlstra
2007-05-04 10:27 ` [PATCH 35/40] From: Mike Christie <mchristi@redhat.com> Peter Zijlstra
2007-05-04 10:27 ` [PATCH 36/40] iscsi: fixup of the ep_connect patch Peter Zijlstra
2007-05-04 10:27 ` [PATCH 37/40] iscsi: ensure the iscsi kernel fd is not usable in userspace Peter Zijlstra
2007-05-04 10:27 ` [PATCH 38/40] netlink: add SOCK_VMIO support to AF_NETLINK Peter Zijlstra
2007-05-04 10:27 ` [PATCH 39/40] mm: a process flags to avoid blocking allocations Peter Zijlstra
2007-05-04 10:27 ` [PATCH 40/40] iscsi: support for swapping over iSCSI Peter Zijlstra
2007-05-04 15:22 ` [PATCH 00/40] Swap over Networked storage -v12 Daniel Walker
2007-05-04 15:38 ` Peter Zijlstra
2007-05-04 15:59 ` Daniel Walker
2007-05-04 18:09 ` Mike Snitzer
2007-05-04 19:31 ` Daniel Walker
2007-05-04 19:54 ` David Miller, Mike Snitzer
2007-05-04 21:36 ` Arnaldo Carvalho de Melo
2007-05-04 19:27 ` David Miller, Peter Zijlstra
2007-05-04 19:41 ` Peter Zijlstra
2007-05-04 20:02 ` David Miller, Peter Zijlstra
2007-05-04 20:29 ` Jeff Garzik
2007-05-05 9:43 ` Christoph Hellwig
2007-05-05 9:55 ` William Lee Irwin III
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