From: Rusty Russell <rusty@rustcorp.com.au>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: akpm@linux-foundation.org, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, Andi Kleen <andi@firstfloor.org>,
Adrian Bunk <bunk@stusta.de>,
Christoph Hellwig <hch@infradead.org>,
akpm@osdl.org
Subject: Re: [patch 12/17] Immediate Values - Kconfig menu in EMBEDDED
Date: Thu, 10 Apr 2008 13:23:55 +1000 [thread overview]
Message-ID: <200804101323.56697.rusty@rustcorp.com.au> (raw)
In-Reply-To: <20080409152050.721310907@polymtl.ca>
On Thursday 10 April 2008 01:08:41 Mathieu Desnoyers wrote:
> +config IMMEDIATE
> + default y if !DISABLE_IMMEDIATE
Wouldn't it be simlpler to roll DISABLE_IMMEDIATE into this?
ie.
default y
depends on HAVE_IMMEDIATE
bool "Immediate value optimization" if EMBEDDED
help
Immediate values are used as read-mostly variables that are rarely
updated. They use code patching to modify the values inscribed in the
instruction stream. It provides a way to save precious cache lines
that would otherwise have to be used by these variables.
It consumes slightly more memory and requires to modify the instruction
stream each time a variable is updated. Should really be disabled for
embedded systems with read-only text.
Cheers,
Rusty.
next prev parent reply other threads:[~2008-04-10 3:25 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-09 15:08 [patch 00/17] Text Edit Lock and Immediate Values for 2.6.25-rc8-mm1 Mathieu Desnoyers
2008-04-09 15:08 ` [patch 01/17] Kprobes - use a mutex to protect the instruction pages list Mathieu Desnoyers
2008-04-09 20:08 ` Masami Hiramatsu
2008-04-09 15:08 ` [patch 02/17] Kprobes - do not use kprobes mutex in arch code Mathieu Desnoyers
2008-04-09 20:08 ` Masami Hiramatsu
2008-04-09 15:08 ` [patch 03/17] Kprobes - declare kprobe_mutex static Mathieu Desnoyers
2008-04-09 20:08 ` Masami Hiramatsu
2008-04-09 15:08 ` [patch 04/17] x86 - Enhance DEBUG_RODATA support - alternatives Mathieu Desnoyers
2008-04-09 15:08 ` [patch 05/17] x86 Fix text_poke for vmalloced pages Mathieu Desnoyers
2008-04-09 15:08 ` [patch 06/17] x86 - Enhance DEBUG_RODATA support for hotplug and kprobes Mathieu Desnoyers
2008-04-09 15:08 ` [patch 07/17] Text Edit Lock - Architecture Independent Code Mathieu Desnoyers
2008-04-09 15:08 ` [patch 08/17] Text Edit Lock - kprobes architecture independent support Mathieu Desnoyers
2008-04-09 15:08 ` [patch 09/17] Add all cpus option to stop machine run Mathieu Desnoyers
2008-04-09 18:10 ` Alexey Dobriyan
2008-04-09 18:24 ` Andi Kleen
2008-04-10 3:34 ` Rusty Russell
2008-04-10 4:26 ` KOSAKI Motohiro
2008-04-09 18:54 ` Mathieu Desnoyers
2008-04-09 15:08 ` [patch 10/17] Immediate Values - Architecture Independent Code Mathieu Desnoyers
2008-04-09 15:08 ` [patch 11/17] Implement immediate update via stop_machine_run Mathieu Desnoyers
2008-04-10 8:04 ` KOSAKI Motohiro
2008-04-10 20:01 ` Mathieu Desnoyers
2008-04-11 4:50 ` KOSAKI Motohiro
2008-04-09 15:08 ` [patch 12/17] Immediate Values - Kconfig menu in EMBEDDED Mathieu Desnoyers
2008-04-10 3:23 ` Rusty Russell [this message]
2008-04-10 19:32 ` [patch 12/17] Immediate Values - Kconfig menu in EMBEDDED (updated) Mathieu Desnoyers
2008-04-10 21:54 ` Rusty Russell
2008-04-14 23:52 ` Mathieu Desnoyers
2008-04-09 15:08 ` [patch 13/17] Immediate Values - x86 Optimization Mathieu Desnoyers
2008-04-09 18:01 ` H. Peter Anvin
2008-04-09 19:08 ` Mathieu Desnoyers
2008-04-09 22:33 ` H. Peter Anvin
2008-04-10 0:42 ` Mathieu Desnoyers
2008-04-10 0:47 ` H. Peter Anvin
2008-04-09 20:21 ` [patch 13/17] Immediate Values - x86 Optimization (updated) Mathieu Desnoyers
2008-04-09 22:33 ` H. Peter Anvin
2008-04-09 23:15 ` Mathieu Desnoyers
2008-04-09 15:08 ` [patch 14/17] Add text_poke and sync_core to powerpc Mathieu Desnoyers
2008-04-09 15:08 ` [patch 15/17] Immediate Values - Powerpc Optimization Mathieu Desnoyers
2008-04-09 15:08 ` [patch 16/17] Immediate Values - Documentation Mathieu Desnoyers
2008-04-10 3:33 ` Rusty Russell
2008-04-11 1:16 ` Mathieu Desnoyers
2008-04-11 15:06 ` Rusty Russell
2008-04-15 0:12 ` Mathieu Desnoyers
2008-04-11 13:44 ` [RFC PATCH] Immediate Values Support init Mathieu Desnoyers
2008-04-09 15:08 ` [patch 17/17] Scheduler Profiling - Use Immediate Values Mathieu Desnoyers
2008-04-10 4:23 ` [patch 00/17] Text Edit Lock and Immediate Values for 2.6.25-rc8-mm1 KOSAKI Motohiro
2008-04-10 7:31 ` Takashi Nishiie
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