From: Russell King <rmk+lkml@arm.linux.org.uk>
To: Greg KH <greg@kroah.com>
Cc: Sam Ravnborg <sam@ravnborg.org>,
linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org,
linux-arch@vger.kernel.org,
Randy Dunlap <randy.dunlap@oracle.com>,
Adrian Bunk <bunk@kernel.org>
Subject: Re: [PATCH] Use separate sections for __dev/__cpu/__mem code/data
Date: Tue, 22 Jan 2008 21:25:01 +0000 [thread overview]
Message-ID: <20080122212501.GA17434@flint.arm.linux.org.uk> (raw)
In-Reply-To: <20080122211715.GA26279@kroah.com>
On Tue, Jan 22, 2008 at 01:17:15PM -0800, Greg KH wrote:
> I like this a lot. It makes things much more understandable from a
> driver developer's point of view, and would allow us to mark some things
> as freeable when we do not run with a CPU hotplug system :)
You mean at run time - I'm not sure if there's any advantage to that.
In order to free the hotplug cpu data and text, you'd have to make
those sections page aligned - and then you have the question of
how much space you are wasting in doing so. That will be variable
over time as the code changes.
Also, if you were to merge the hotplug cpu text and data to reduce
the wastage, would that cause any architectures any issues? (Thinking
about execute-only being set on the kernel's text section only, etc.)
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of:
next prev parent reply other threads:[~2008-01-22 21:25 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-20 20:05 kbuild: improved Section mismatch detection Sam Ravnborg
2008-01-20 20:08 ` [PATCH] kbuild: fix so modpost can now check any .o file Sam Ravnborg
2008-01-20 20:08 ` [PATCH] kbuild: try harder to find symbol names in modpost Sam Ravnborg
2008-01-20 20:08 ` [PATCH] kbuild: code refactoring " Sam Ravnborg
2008-01-20 20:08 ` [PATCH] kbuild: introduce blacklisting " Sam Ravnborg
2008-01-20 20:09 ` [PATCH] kbuild: check section names consistently " Sam Ravnborg
2008-01-20 20:09 ` [PATCH] all archs: consolidate init and exit sections in vmlinux.lds.h Sam Ravnborg
2008-01-20 20:09 ` [PATCH] compiler.h: introduce __section() Sam Ravnborg
2008-01-20 20:09 ` [PATCH] Use separate sections for __dev/__cpu/__mem code/data Sam Ravnborg
2008-01-21 7:33 ` Paul Mundt
2008-01-21 9:57 ` Sam Ravnborg
2008-01-21 10:29 ` Andreas Schwab
2008-01-21 10:45 ` Sam Ravnborg
2008-01-21 10:47 ` Sam Ravnborg
2008-01-21 10:52 ` Paul Mundt
2008-01-21 12:06 ` Sam Ravnborg
2008-01-22 0:56 ` Paul Mundt
2008-01-22 3:25 ` Sam Ravnborg
2008-01-22 21:17 ` Greg KH
2008-01-22 21:25 ` Russell King [this message]
2008-01-21 1:00 ` [PATCH] kbuild: introduce blacklisting in modpost Rusty Russell
2008-01-21 0:56 ` [PATCH] kbuild: fix so modpost can now check any .o file Rusty Russell
2008-01-21 6:11 ` Sam Ravnborg
2008-01-20 21:33 ` kbuild: improved Section mismatch detection Sam Ravnborg
2008-01-20 22:27 ` Adrian Bunk
2008-01-21 2:51 ` Sam Ravnborg
2008-01-21 20:31 ` Sam Ravnborg
2008-01-21 20:56 ` Adrian Bunk
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