From: Andi Kleen <andi@firstfloor.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Tim Abbott <tabbott@MIT.EDU>,
Linux kernel mailing list <linux-kernel@vger.kernel.org>,
Anders Kaseorg <andersk@MIT.EDU>, Waseem Daher <wdaher@MIT.EDU>,
Denys Vlasenko <vda.linux@googlemail.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Andi Kleen <andi@firstfloor.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Jeff Arnold <jbarnold@MIT.EDU>,
Andrew Morton <akpm@linux-foundation.org>,
Jon Masters <jonathan@jonmasters.org>
Subject: Re: [PATCH v2 0/4] Add support for compiling with -ffunction-sections -fdata-sections
Date: Tue, 21 Apr 2009 12:24:02 +0200 [thread overview]
Message-ID: <20090421102402.GZ14687@one.firstfloor.org> (raw)
In-Reply-To: <alpine.LFD.2.00.0904201730590.2199@localhost.localdomain>
> Are there any advantages outside of the size things?
Yes ksplice needs it too.
> Do we end up packing data better?
There used to be tools to do that (use profile feedback to pack
code), but I'm not sure they would help the kernel too much
because they were mostly aimed at demand paging. But such tools
definitely would need this infrastructure. Iirc there are some architectures
othat benefit from hold/cold partioning during execution.
> I'd like to have some more champions of this code, in other words.
I definitely like the size angle -- letting the linker eliminate
code without ifdef jungles certainly sounds attractive to me.
Also if we find broken toolchains I suppose it wouldn't be too
difficult to black list them.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2009-04-21 10:20 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-05 23:14 [PATCH v2 0/4] Add support for compiling with -ffunction-sections -fdata-sections Tim Abbott
2009-04-05 23:14 ` [PATCH v2 1/4] Make section names compatible " Tim Abbott
2009-04-05 23:14 ` [PATCH v2 2/4] modpost: Check the section flags, not name, to catch missing "ax"/"aw" Tim Abbott
2009-04-05 23:14 ` [PATCH v2 3/4] modpost: Support objects with more than 64k sections Tim Abbott
2009-04-05 23:14 ` [PATCH v2 4/4] x86: Add an option to compile with -ffunction-sections -fdata-sections Tim Abbott
2009-04-08 0:34 ` [PATCH v2 0/4] Add support for compiling " Tim Abbott
2009-04-08 5:22 ` Rusty Russell
2009-04-20 20:26 ` Tim Abbott
2009-04-20 23:40 ` Linus Torvalds
2009-04-21 0:26 ` Tim Abbott
2009-04-21 0:35 ` Linus Torvalds
2009-04-21 1:25 ` H. Peter Anvin
2009-04-21 1:49 ` Denys Vlasenko
2009-04-21 3:18 ` Arjan van de Ven
2009-04-21 3:26 ` Anders Kaseorg
2009-04-21 10:26 ` Andi Kleen
2009-04-21 6:01 ` Tim Abbott
2009-04-21 10:24 ` Andi Kleen [this message]
2009-04-23 20:48 ` [PATCH v3 0/3] " Tim Abbott
2009-04-23 20:49 ` [PATCH v3 1/3] Make section names compatible " Tim Abbott
2009-04-23 20:49 ` [PATCH v3 2/3] modpost: Check the section flags, not name, to catch missing "ax"/"aw" Tim Abbott
2009-04-23 20:49 ` [PATCH v3 3/3] modpost: Support objects with more than 64k sections Tim Abbott
2009-04-24 0:16 ` [PATCH v3 1/3] Make section names compatible with -ffunction-sections -fdata-sections Paul Mundt
2009-04-24 17:23 ` Sam Ravnborg
2009-04-26 2:10 ` Tim Abbott
2009-04-26 2:10 ` [PATCH 01/15] Add new HEAD_TEXT_SECTION macro Tim Abbott
2009-04-26 2:10 ` [PATCH 02/15] xtensa: convert to use __HEAD and HEAD_TEXT macros Tim Abbott
2009-04-26 2:10 ` [PATCH 03/15] alpha: " Tim Abbott
2009-04-26 2:10 ` [PATCH 04/15] frv: convert frv " Tim Abbott
2009-04-26 2:11 ` [PATCH 05/15] arm: convert " Tim Abbott
2009-04-26 2:11 ` [PATCH 06/15] ia64: " Tim Abbott
2009-04-26 2:11 ` [PATCH 07/15] m32r: " Tim Abbott
2009-04-26 2:11 ` [PATCH 08/15] m68k: " Tim Abbott
2009-04-26 2:11 ` [PATCH 09/15] mn10300: " Tim Abbott
2009-04-26 2:11 ` [PATCH 10/15] powerpc: " Tim Abbott
2009-04-26 2:11 ` [PATCH 11/15] s390: " Tim Abbott
2009-04-26 2:11 ` [PATCH 12/15] sh: " Tim Abbott
2009-04-26 2:11 ` [PATCH 13/15] sparc: " Tim Abbott
2009-04-26 2:11 ` [PATCH 14/15] x86: " Tim Abbott
2009-04-26 2:11 ` [PATCH 15/15] modpost: convert modpost to use HEAD_TEXT_SECTION macro Tim Abbott
2009-04-26 11:30 ` Sam Ravnborg
2009-04-26 22:18 ` Anders Kaseorg
2009-04-26 11:28 ` [PATCH 14/15] x86: convert to use __HEAD and HEAD_TEXT macros Sam Ravnborg
2009-04-26 16:40 ` Linus Torvalds
2009-04-26 17:12 ` Linus Torvalds
2009-04-26 18:34 ` Sam Ravnborg
2009-04-26 18:56 ` Linus Torvalds
2009-04-26 19:23 ` Sam Ravnborg
2009-04-26 21:07 ` [PATCH] x86: beautify vmlinux_64.lds.S Sam Ravnborg
2009-04-27 4:54 ` [tip:x86/kbuild] " tip-bot for Sam Ravnborg
2009-04-27 4:59 ` [PATCH 14/15] x86: convert to use __HEAD and HEAD_TEXT macros Ingo Molnar
2009-04-27 6:42 ` Sam Ravnborg
2009-04-27 7:19 ` Ingo Molnar
2009-04-27 7:37 ` Sam Ravnborg
2009-04-26 20:50 ` Andi Kleen
2009-04-27 3:47 ` Ingo Molnar
2009-04-30 10:39 ` [tip:x86/kbuild] x86: boot/compressed/vmlinux.lds.S: fix build of bzImage with 64 bit compiler tip-bot for Sam Ravnborg
2009-04-30 14:52 ` H. Peter Anvin
2009-04-30 15:09 ` Sam Ravnborg
2009-04-30 16:29 ` H. Peter Anvin
2009-04-30 17:52 ` Sam Ravnborg
2009-04-30 19:02 ` H. Peter Anvin
2009-04-26 11:24 ` [PATCH 13/15] sparc: convert to use __HEAD and HEAD_TEXT macros Sam Ravnborg
2009-04-26 11:24 ` [PATCH 12/15] sh: " Sam Ravnborg
2009-04-26 11:23 ` [PATCH 11/15] s390: " Sam Ravnborg
2009-04-26 11:23 ` [PATCH 10/15] powerpc: " Sam Ravnborg
2009-04-26 11:22 ` [PATCH 09/15] mn10300: " Sam Ravnborg
2009-04-26 11:22 ` [PATCH 08/15] m68k: " Sam Ravnborg
2009-04-26 11:21 ` [PATCH 07/15] m32r: " Sam Ravnborg
2009-04-28 3:34 ` Hirokazu Takata
2009-04-26 11:21 ` [PATCH 06/15] ia64: " Sam Ravnborg
2009-04-26 11:19 ` [PATCH 05/15] arm: " Sam Ravnborg
2009-04-27 16:46 ` Tim Abbott
2009-04-27 17:00 ` Russell King
2009-04-27 17:06 ` Linus Torvalds
2009-04-27 17:29 ` Luck, Tony
2009-04-28 8:56 ` Ralf Baechle
2009-04-26 11:16 ` [PATCH 04/15] frv: convert frv " Sam Ravnborg
2009-04-26 11:15 ` [PATCH 03/15] alpha: convert " Sam Ravnborg
2009-04-26 11:13 ` [PATCH 02/15] xtensa: " Sam Ravnborg
2009-04-26 16:29 ` [PATCH 01/15] Add new HEAD_TEXT_SECTION macro Linus Torvalds
2009-04-26 2:42 ` [PATCH v3 1/3] Make section names compatible with -ffunction-sections -fdata-sections Paul Mundt
2009-04-26 9:15 ` Sam Ravnborg
2009-04-26 9:20 ` [PATCH] kbuild: fix comment in modpost.c Sam Ravnborg
2009-04-26 17:28 ` Tim Abbott
2009-04-26 9:09 ` [PATCH v3 1/3] Make section names compatible with -ffunction-sections -fdata-sections Sam Ravnborg
2009-04-26 21:53 ` Tim Abbott
2009-04-26 13:09 ` Rusty Russell
2009-04-24 0:14 ` [PATCH v3 0/3] Add support for compiling " Paul Mundt
2009-04-24 14:19 ` Masami Hiramatsu
2009-04-24 15:32 ` Tim Abbott
2009-04-25 1:49 ` Masami Hiramatsu
2009-04-21 1:05 ` [PATCH v2 0/4] " Denys Vlasenko
2009-04-21 5:50 ` Rusty Russell
2009-04-22 12:47 ` Paul Mundt
2009-04-21 14:02 ` Américo Wang
2009-04-21 17:40 ` Anders Kaseorg
2009-04-22 11:38 ` Masami Hiramatsu
2009-04-22 17:13 ` Tim Abbott
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