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From: Rusty Russell <rusty@rustcorp.com.au>
To: Andi Kleen <ak@suse.de>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
Andrew Morton <akpm@linux-foundation.org>,
virtualization@lists.osdl.org,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [patch 4/6] Convert PDA into the percpu section
Date: Sat, 31 Mar 2007 12:54:17 +1000 [thread overview]
Message-ID: <1175309657.12230.420.camel@localhost.localdomain> (raw)
In-Reply-To: <200703310435.59298.ak@suse.de>
On Sat, 2007-03-31 at 04:35 +0200, Andi Kleen wrote:
> On Saturday 31 March 2007 04:00, Jeremy Fitzhardinge wrote:
> > Currently x86 (similar to x84-64) has a special per-cpu structure
> > called "i386_pda" which can be easily and efficiently referenced via
> > the %fs register. An ELF section is more flexible than a structure,
> > allowing any piece of code to use this area. Indeed, such a section
> > already exists: the per-cpu area.
>
> Hmm, I'm a little reluctant. This moves i386 more away from x86-64
> again. If we ever merge them it would mean more work. Do you really need it?
Well, I think the merge should go the other way in this case: this
really does simplify things.
The only thing stopping x86-64 from doing the same as i386 is the
stack-protector stuff. And that can be fixed (unfortunately requires a
gcc patch to change the %gs:40 to %gs:__gcc_stack_protector_offset and
emit a weak absolute symbol __gss_stack_protector_offset = 40).
I shall prepare a patch for that next week; I've been busy Kleening up
lguest 8)
Rusty.
next prev parent reply other threads:[~2007-03-31 2:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-31 2:00 [patch 0/6] i386 gdt and percpu cleanups Jeremy Fitzhardinge
2007-03-31 2:00 ` [patch 1/6] i386: Account for module percpu space separately from kernel percpu Jeremy Fitzhardinge
2007-03-31 2:00 ` [patch 2/6] Allow percpu variables to be page-aligned Jeremy Fitzhardinge
2007-03-31 2:00 ` [patch 3/6] Page-align the GDT Jeremy Fitzhardinge
2007-03-31 2:00 ` [patch 4/6] Convert PDA into the percpu section Jeremy Fitzhardinge
2007-03-31 2:35 ` Andi Kleen
2007-03-31 2:54 ` Rusty Russell [this message]
2007-03-31 3:00 ` Jeremy Fitzhardinge
2007-03-31 2:00 ` [patch 5/6] cleanups to help using per-cpu variables from asm Jeremy Fitzhardinge
2007-03-31 2:00 ` [patch 6/6] Define per_cpu_offset Jeremy Fitzhardinge
2007-03-31 2:56 ` [patch 0/6] i386 gdt and percpu cleanups Rusty Russell
2007-03-31 3:05 ` Jeremy Fitzhardinge
2007-03-31 3:16 ` Jeremy Fitzhardinge
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