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xen-devel
[Xen-devel] Re: [PATCH RFC V4 09/10] x86/jump_label: use GENERIC_NOP5_AT
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To: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH RFC V4 09/10] x86/jump_label: use GENERIC_NOP5_ATOMIC instead of jmp5 +0 |
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From: |
Steven Rostedt <rostedt@xxxxxxxxxxx> |
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Date: |
Thu, 13 Oct 2011 14:37:02 -0400 |
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Cc: |
the arch/x86 maintainers <x86@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Jan Glauber <jang@xxxxxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Jason Baron <jbaron@xxxxxxxxxx>, David Daney <david.daney@xxxxxxxxxx>, Michael, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Ellerman <michael@xxxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx> |
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Delivery-date: |
Thu, 13 Oct 2011 11:37:58 -0700 |
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<cover.1318464169.git.jeremy.fitzhardinge@xxxxxxxxxx> <34ede5db1571d541a5c3fc49923bb353a37dd431.1318464413.git.jeremy.fitzhardinge@xxxxxxxxxx> <4E97067A.2070305@xxxxxxxxx> <4E97188A.6040400@xxxxxxxx> |
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On Thu, 2011-10-13 at 09:57 -0700, Jeremy Fitzhardinge wrote:
> On 10/13/2011 08:40 AM, H. Peter Anvin wrote:
> > On 10/12/2011 05:08 PM, Jeremy Fitzhardinge wrote:
> >> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
> >>
> >> GENERIC_NOP5_ATOMIC should make a better nop.
> >>
> > On 32 bits, yes. On 64 bits you should use P6_NOP5_ATOMIC.
>
> Something like this?
>
No, we only care about 5byte nops here. Look at ideal_nop in
alterative.c
-- Steve
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