From: "H. Peter Anvin" <hpa@zytor.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
"David S. Miller" <davem@davemloft.net>,
David Daney <david.daney@cavium.com>,
Michael Ellerman <michael@ellerman.id.au>,
Jan Glauber <jang@linux.vnet.ibm.com>,
Jason Baron <jbaron@redhat.com>,
the arch/x86 maintainers <x86@kernel.org>,
Xen Devel <xen-devel@lists.xensource.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Subject: Re: [PATCH RFC V4 09/10] x86/jump_label: use GENERIC_NOP5_ATOMIC instead of jmp5 +0
Date: Fri, 14 Oct 2011 14:53:53 -0700 [thread overview]
Message-ID: <4E98AF71.40303@zytor.com> (raw)
In-Reply-To: <1318531022.12224.13.camel@gandalf.stny.rr.com>
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@citrix.com>
>>>>
>>>> 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
next prev parent reply other threads:[~2011-10-14 21:54 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-13 0:08 [PATCH RFC V4 00/10] jump-label: allow early jump_label_enable() Jeremy Fitzhardinge
[not found] ` <cover.1318464413.git.jeremy.fitzhardinge@citrix.com>
2011-10-13 0:08 ` [PATCH RFC V4 01/10] jump_label: use proper atomic_t initializer Jeremy Fitzhardinge
2011-10-13 0:08 ` [PATCH RFC V4 02/10] stop_machine: make stop_machine safe and efficient to call early Jeremy Fitzhardinge
2011-10-13 0:08 ` [PATCH RFC V4 03/10] jump_label: if a key has already been initialized, don't nop it out Jeremy Fitzhardinge
2011-10-13 0:08 ` [PATCH RFC V4 04/10] x86/jump_label: drop arch_jump_label_text_poke_early() Jeremy Fitzhardinge
2011-10-13 10:15 ` Peter Zijlstra
2011-10-13 0:08 ` [PATCH RFC V4 05/10] sparc/jump_label: " Jeremy Fitzhardinge
2011-10-13 0:08 ` [PATCH RFC V4 06/10] jump_label: add arch_jump_label_transform_static() to optimise non-live code updates Jeremy Fitzhardinge
2011-10-13 10:32 ` Peter Zijlstra
2011-10-13 13:54 ` Jason Baron
2011-10-13 15:29 ` Peter Zijlstra
2011-10-13 15:29 ` Peter Zijlstra
2011-10-13 15:55 ` Jason Baron
2011-10-13 16:32 ` Peter Zijlstra
2011-10-13 16:32 ` Peter Zijlstra
2011-10-13 0:08 ` [PATCH RFC V4 07/10] s390/jump-label: add arch_jump_label_transform_static() Jeremy Fitzhardinge
2011-10-13 0:08 ` [PATCH RFC V4 08/10] x86/jump_label: " Jeremy Fitzhardinge
2011-10-13 10:36 ` Peter Zijlstra
2011-10-13 0:08 ` [PATCH RFC V4 09/10] x86/jump_label: use GENERIC_NOP5_ATOMIC instead of jmp5 +0 Jeremy Fitzhardinge
2011-10-13 15:40 ` H. Peter Anvin
2011-10-13 16:50 ` Jeremy Fitzhardinge
2011-10-14 21:52 ` H. Peter Anvin
2011-10-13 16:57 ` Jeremy Fitzhardinge
2011-10-13 18:37 ` Steven Rostedt
2011-10-13 18:37 ` Steven Rostedt
2011-10-14 21:53 ` H. Peter Anvin [this message]
2011-10-15 0:22 ` Steven Rostedt
2011-10-14 21:53 ` H. Peter Anvin
2011-10-13 0:08 ` [PATCH RFC V4 10/10] jump-label: initialize jump-label subsystem much earlier Jeremy Fitzhardinge
2011-10-13 10:43 ` Peter Zijlstra
2011-10-13 13:59 ` Jason Baron
2011-10-13 16:56 ` Jeremy Fitzhardinge
2011-10-14 21:51 ` Jeremy Fitzhardinge
2011-10-15 8:42 ` Peter Zijlstra
2011-10-16 1:52 ` Jeremy Fitzhardinge
2011-10-18 11:02 ` Peter Zijlstra
2011-10-25 17:56 ` Jeremy Fitzhardinge
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