From: Christoph Lameter <cl@linux.com>
To: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>,
Andi Kleen <andi@firstfloor.org>,
tj@kernel.org, Metathronius Galabant <m.galabant@googlemail.com>,
Matt Mackall <mpm@selenic.com>,
Eric Dumazet <eric.dumazet@gmail.com>,
Adrian Drzewiecki <z@drze.net>, Shaohua Li <shaohua.li@intel.com>,
Alex Shi <alex.shi@intel.com>,
linux-mm@kvack.org
Subject: Re: [rfc 01/18] slub: Get rid of the node field
Date: Tue, 15 Nov 2011 10:07:57 -0600 (CST) [thread overview]
Message-ID: <alpine.DEB.2.00.1111151006130.22502@router.home> (raw)
In-Reply-To: <CAOJsxLFM9W=NiGFwjt8-iwrTYrAZiJ2_Mw_EUYyXYE4TKPs9-A@mail.gmail.com>
On Mon, 14 Nov 2011, Pekka Enberg wrote:
> On Fri, Nov 11, 2011 at 10:07 PM, Christoph Lameter <cl@linux.com> wrote:
> > The node field is always page_to_nid(c->page). So its rather easy to
> > replace. Note that there will be additional overhead in various hot paths
> > due to the need to mask a set of bits in page->flags and shift the
> > result.
> >
> > Signed-off-by: Christoph Lameter <cl@linux.com>
>
> This is a nice cleanup even if we never go irqless in the slowpaths.
> Is page_to_nid() really that slow?
The fastpath only uses a few cycles now. Relatively high overhead is
added.
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next prev parent reply other threads:[~2011-11-15 16:08 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-11 20:07 [rfc 00/18] slub: irqless/lockless slow allocation paths Christoph Lameter
2011-11-11 20:07 ` [rfc 01/18] slub: Get rid of the node field Christoph Lameter
2011-11-14 21:42 ` Pekka Enberg
2011-11-15 16:07 ` Christoph Lameter [this message]
2011-11-20 23:01 ` David Rientjes
2011-11-21 17:17 ` Christoph Lameter
2011-11-11 20:07 ` [rfc 02/18] slub: Separate out kmem_cache_cpu processing from deactivate_slab Christoph Lameter
2011-11-20 23:10 ` David Rientjes
2011-11-11 20:07 ` [rfc 03/18] slub: Extract get_freelist from __slab_alloc Christoph Lameter
2011-11-14 21:43 ` Pekka Enberg
2011-11-15 16:08 ` Christoph Lameter
2011-12-13 20:31 ` Pekka Enberg
2011-11-20 23:18 ` David Rientjes
2011-11-11 20:07 ` [rfc 04/18] slub: Use freelist instead of "object" in __slab_alloc Christoph Lameter
2011-11-14 21:44 ` Pekka Enberg
2011-11-20 23:22 ` David Rientjes
2011-11-11 20:07 ` [rfc 05/18] slub: Simplify control flow in __slab_alloc() Christoph Lameter
2011-11-14 21:45 ` Pekka Enberg
2011-11-20 23:24 ` David Rientjes
2011-11-11 20:07 ` [rfc 06/18] slub: Use page variable instead of c->page Christoph Lameter
2011-11-14 21:46 ` Pekka Enberg
2011-11-20 23:27 ` David Rientjes
2011-11-11 20:07 ` [rfc 07/18] slub: pass page to node_match() instead of kmem_cache_cpu structure Christoph Lameter
2011-11-20 23:28 ` David Rientjes
2011-11-11 20:07 ` [rfc 08/18] slub: enable use of deactivate_slab with interrupts on Christoph Lameter
2011-11-11 20:07 ` [rfc 09/18] slub: Run deactivate_slab with interrupts enabled Christoph Lameter
2011-11-11 20:07 ` [rfc 10/18] slub: Enable use of get_partial " Christoph Lameter
2011-11-11 20:07 ` [rfc 11/18] slub: Acquire_slab() avoid loop Christoph Lameter
2011-11-11 20:07 ` [rfc 12/18] slub: Remove kmem_cache_cpu dependency from acquire slab Christoph Lameter
2011-11-11 20:07 ` [rfc 13/18] slub: Add functions to manage per cpu freelists Christoph Lameter
2011-11-11 20:07 ` [rfc 14/18] slub: Decomplicate the get_pointer_safe call and fixup statistics Christoph Lameter
2011-11-11 20:07 ` [rfc 15/18] slub: new_slab_objects() can also get objects from partial list Christoph Lameter
2011-11-11 20:07 ` [rfc 16/18] slub: Drop page field from kmem_cache_cpu Christoph Lameter
2011-11-11 20:07 ` [rfc 17/18] slub: Move __slab_free() into slab_free() Christoph Lameter
2011-11-11 20:07 ` [rfc 18/18] slub: Move __slab_alloc() into slab_alloc() Christoph Lameter
2011-11-16 17:39 ` [rfc 00/18] slub: irqless/lockless slow allocation paths Eric Dumazet
2011-11-16 17:45 ` Eric Dumazet
2011-11-20 23:32 ` David Rientjes
2011-11-20 23:30 ` David Rientjes
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