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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: |
Steven Rostedt <rostedt@xxxxxxxxxxx> |
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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: |
"H. Peter Anvin" <hpa@xxxxxxxxx> |
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Date: |
Fri, 14 Oct 2011 14:53:53 -0700 |
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Cc: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx>, 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>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Michael Ellerman <michael@xxxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx> |
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Fri, 14 Oct 2011 14:56:04 -0700 |
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<cover.1318464169.git.jeremy.fitzhardinge@xxxxxxxxxx> <34ede5db1571d541a5c3fc49923bb353a37dd431.1318464413.git.jeremy.fitzhardinge@xxxxxxxxxx> <4E97067A.2070305@xxxxxxxxx> <4E97188A.6040400@xxxxxxxx> <1318531022.12224.13.camel@xxxxxxxxxxxxxxxxxxx> |
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On 10/13/2011 11:37 AM, Steven Rostedt wrote:
> 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
>
He needs a compile-time alternative.
-hpa
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