From: Arjan van de Ven <arjan@infradead.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andi Kleen <andi@firstfloor.org>,
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, Jason Baron <jbaron@redhat.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Adrian Bunk <bunk@stusta.de>,
Christoph Hellwig <hch@infradead.org>
Subject: Re: [patch 02/12] Immediate Values - Architecture Independent Code
Date: Mon, 28 Sep 2009 22:37:35 +0200 [thread overview]
Message-ID: <20090928223735.74267e3e@infradead.org> (raw)
In-Reply-To: <20090928195444.GF1656@one.firstfloor.org>
On Mon, 28 Sep 2009 21:54:45 +0200
Andi Kleen <andi@firstfloor.org> wrote:
> > btw just to add to this:
> > caches are unified code/data after L1 in general... it then does not
> > matter much if you encode the "almost constant" in the codestream or
> > slightly farther away, in both cases it takes up cache space.
>
> It does take up cache space, but when it's embedded in the instruction
> stream the CPU has it usually already prefetched (CPUs are very good
> at prefetching instructions). That's often not the case
> with arbitary data accesses like this.
this makes me wonder what happens when a variable is used in multiple
places... that makes the icache overhead multiply right?
--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
next prev parent reply other threads:[~2009-09-28 20:37 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-24 13:26 [patch 00/12] Immediate Values Mathieu Desnoyers
2009-09-24 13:26 ` [patch 01/12] x86: text_poke_early non static Mathieu Desnoyers
2009-09-24 13:26 ` [patch 02/12] Immediate Values - Architecture Independent Code Mathieu Desnoyers
2009-09-25 4:20 ` Andrew Morton
2009-09-27 23:23 ` Mathieu Desnoyers
2009-09-28 1:23 ` Andi Kleen
2009-09-28 17:46 ` Andrew Morton
2009-09-28 18:03 ` Arjan van de Ven
2009-09-28 18:40 ` Mathieu Desnoyers
2009-09-28 19:54 ` Andi Kleen
2009-09-28 20:37 ` Arjan van de Ven [this message]
2009-09-28 21:32 ` H. Peter Anvin
2009-09-28 22:05 ` Mathieu Desnoyers
2009-09-28 20:11 ` Andi Kleen
2009-09-28 21:16 ` Andrew Morton
2009-09-28 22:01 ` Mathieu Desnoyers
2009-09-24 13:26 ` [patch 03/12] Immediate Values - Kconfig menu in EMBEDDED Mathieu Desnoyers
2009-09-24 13:26 ` [patch 04/12] Immediate Values - x86 Optimization Mathieu Desnoyers
2009-09-24 13:26 ` [patch 05/12] Add text_poke and sync_core to powerpc Mathieu Desnoyers
2009-09-24 13:26 ` [patch 06/12] Immediate Values - Powerpc Optimization Mathieu Desnoyers
2009-09-24 13:26 ` [patch 07/12] Sparc create asm.h Mathieu Desnoyers
2009-09-24 21:10 ` David Miller
2009-09-24 13:26 ` [patch 08/12] sparc64: Optimized immediate value implementation Mathieu Desnoyers
2009-09-24 13:26 ` [patch 09/12] Immediate Values - Documentation Mathieu Desnoyers
2009-09-24 13:26 ` [patch 10/12] Immediate Values Support init Mathieu Desnoyers
2009-09-24 15:33 ` [patch 10.1/12] Immediate values fixes for modules Mathieu Desnoyers
2009-09-24 15:35 ` [patch 10.2/12] Fix Immediate Values x86_64 support old gcc Mathieu Desnoyers
2009-09-24 13:26 ` [patch 11/12] Scheduler Profiling - Use Immediate Values Mathieu Desnoyers
2009-09-24 13:26 ` [patch 12/12] Tracepoints - " Mathieu Desnoyers
2009-09-24 14:51 ` Peter Zijlstra
2009-09-24 15:03 ` Mathieu Desnoyers
2009-09-24 15:06 ` Peter Zijlstra
2009-09-24 16:01 ` [RFC patch] Immediate Values - x86 Optimization NMI and MCE support Mathieu Desnoyers
2009-09-24 21:59 ` Masami Hiramatsu
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