From: Ravikiran G Thirumalai <kiran@in.ibm.com>
To: Robert Love <rml@tech9.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: How reliable is SLAB_HWCACHE_ALIGN?
Date: Thu, 11 Sep 2003 11:24:30 +0530 [thread overview]
Message-ID: <20030911055428.GA1140@llm08.in.ibm.com> (raw)
In-Reply-To: <1063208464.700.35.camel@localhost>
On Wed, Sep 10, 2003 at 11:41:04AM -0400, Robert Love wrote:
> On Wed, 2003-09-10 at 04:16, Ravikiran G Thirumalai wrote:
>
> > Am I missing something or can there really be two objects on the same
> > cacheline even when SLAB_HWCACHE_ALIGN is specified?
>
> No, you are right.
>
> If your object _must_ be cache aligned, use SLAB_MUST_HWCACHE_ALIGN.
>
WOW!!!
Looking at the code though, SLAB_MUST_HWCACHE_ALIGN is never considered
by kmem_cache_create or kmem_cache_alloc. So, right now, there is no way of
getting objects which are _guaranteed_ to be cacheline aligned!!!(?)
Kiran
next prev parent reply other threads:[~2003-09-11 5:47 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-10 8:16 How reliable is SLAB_HWCACHE_ALIGN? Ravikiran G Thirumalai
2003-09-10 15:41 ` Robert Love
2003-09-11 5:54 ` Ravikiran G Thirumalai [this message]
2003-09-11 11:08 ` [patch] Make slab allocator work with SLAB_MUST_HWCACHE_ALIGN Ravikiran G Thirumalai
2003-09-11 16:19 ` Manfred Spraul
2003-09-11 21:49 ` Manfred Spraul
2003-09-12 8:59 ` Ravikiran G Thirumalai
2003-09-12 9:10 ` Arjan van de Ven
2003-09-13 20:06 ` Manfred Spraul
2003-09-13 20:58 ` Dipankar Sarma
2003-09-14 8:09 ` Ravikiran G Thirumalai
2003-09-14 13:00 ` Dipankar Sarma
2003-09-15 5:13 ` Ravikiran G Thirumalai
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