From: Christoph Lameter <clameter@sgi.com>
To: Pekka J Enberg <penberg@cs.helsinki.fi>
Cc: Matthew Wilcox <matthew@wil.cx>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [patch 08/10] SLUB: Optional fast path using cmpxchg_local
Date: Sun, 28 Oct 2007 20:34:14 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0710282031060.28860@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0710281502480.4207@sbz-30.cs.Helsinki.FI>
On Sun, 28 Oct 2007, Pekka J Enberg wrote:
> - local_irq_restore(flags);
> + object = do_slab_alloc(s, c, gfpflags, node, addr);
> + if (unlikely(!object))
> + goto out;
Undoing the optimization that one of the earlier patches added.
The #ifdef version is for me at least easier to read. The code there is a
special unit that has to deal with the most performance critical piece of
the slab allocator. And the #ifdef there clarifies that any changes have
to be done to both branches.
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next prev parent reply other threads:[~2007-10-29 3:34 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-28 3:31 [patch 00/10] SLUB: SMP regression tests on Dual Xeon E5345 (8p) and new performance patches Christoph Lameter
2007-10-28 3:31 ` [patch 01/10] SLUB: Consolidate add_partial and add_partial_tail to one function Christoph Lameter
2007-10-28 13:07 ` Pekka J Enberg
2007-10-28 3:31 ` [patch 02/10] SLUB: Noinline some functions to avoid them being folded into alloc/free Christoph Lameter
2007-10-28 13:08 ` Pekka J Enberg
2007-10-29 23:25 ` Matt Mackall
2007-10-28 3:31 ` [patch 03/10] SLUB: Move kmem_cache_node determination into add_full and add_partial Christoph Lameter
2007-10-28 13:09 ` Pekka J Enberg
2007-10-28 3:32 ` [patch 04/10] SLUB: Avoid checking for a valid object before zeroing on the fast path Christoph Lameter
2007-10-28 13:10 ` Pekka J Enberg
2007-10-28 3:32 ` [patch 05/10] SLUB: __slab_alloc() exit path consolidation Christoph Lameter
2007-10-28 13:11 ` Pekka J Enberg
2007-10-28 3:32 ` [patch 06/10] SLUB: Provide unique end marker for each slab Christoph Lameter
2007-10-28 3:32 ` [patch 07/10] SLUB: Avoid referencing kmem_cache structure in __slab_alloc Christoph Lameter
2007-10-28 13:12 ` Pekka J Enberg
2007-10-30 18:38 ` Andrew Morton
2007-10-28 3:32 ` [patch 08/10] SLUB: Optional fast path using cmpxchg_local Christoph Lameter
2007-10-28 13:05 ` Pekka J Enberg
2007-10-29 2:59 ` Christoph Lameter
2007-10-29 3:34 ` Christoph Lameter [this message]
2007-10-30 18:30 ` Andrew Morton
2007-10-30 18:49 ` Andrew Morton
2007-10-30 18:58 ` Christoph Lameter
2007-10-30 19:12 ` Mathieu Desnoyers
2007-10-31 1:52 ` [PATCH] local_t Documentation update 2 Mathieu Desnoyers
2007-10-31 2:28 ` [patch 08/10] SLUB: Optional fast path using cmpxchg_local Mathieu Desnoyers
2007-10-28 3:32 ` [patch 09/10] SLUB: Do our own locking via slab_lock and slab_unlock Christoph Lameter
2007-10-28 15:10 ` Pekka J Enberg
2007-10-28 15:14 ` Pekka J Enberg
2007-10-29 3:03 ` Christoph Lameter
2007-10-29 6:30 ` Pekka Enberg
2007-10-30 4:50 ` Nick Piggin
2007-10-30 18:32 ` Christoph Lameter
2007-10-31 1:17 ` Nick Piggin
2007-10-28 3:32 ` [patch 10/10] SLUB: Restructure slab alloc Christoph Lameter
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