From: Ingo Molnar <mingo@elte.hu>
To: David Howells <dhowells@redhat.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
tj@kernel.org, akpm@linux-foundation.org,
linux-kernel@vger.kernel.org,
Rusty Russell <rusty@rustcorp.com.au>,
Fenghua Yu <fenghua.yu@intel.com>,
Suresh Siddha <suresh.b.siddha@intel.com>
Subject: Re: [PATCH] FRV: Fix the section attribute on UP DECLARE_PER_CPU()
Date: Wed, 22 Apr 2009 11:12:26 +0200 [thread overview]
Message-ID: <20090422091226.GA18226@elte.hu> (raw)
In-Reply-To: <30674.1240338986@redhat.com>
* David Howells <dhowells@redhat.com> wrote:
> Any idea what this:
>
> #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)
>
> is intended for?
it is a mixed type of percpu variable: which is per CPU but which
can (and will) also be accessed from other CPUs. This way we
basically cache-line align it and make sure nearby percpu variables
dont get caught up in any cacheline bounces. It was introduced a
couple of years ago.
Ingo
prev parent reply other threads:[~2009-04-22 9:14 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-14 16:10 [PATCH] FRV: Fix the section attribute on UP DECLARE_PER_CPU() David Howells
2009-04-14 16:57 ` Linus Torvalds
2009-04-14 17:57 ` David Howells
2009-04-14 18:06 ` Linus Torvalds
2009-04-15 10:24 ` David Howells
2009-04-15 15:19 ` Linus Torvalds
2009-04-15 16:49 ` Ingo Molnar
2009-04-15 11:40 ` David Howells
2009-04-15 12:03 ` Ingo Molnar
2009-04-15 13:20 ` David Howells
2009-04-15 14:09 ` Ingo Molnar
2009-04-15 15:09 ` David Howells
2009-04-15 16:54 ` Ingo Molnar
2009-04-21 18:36 ` David Howells
2009-04-22 9:12 ` Ingo Molnar [this message]
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