From: "H. Peter Anvin" <hpa@zytor.com>
To: Jason Baron <jbaron@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
Thomas Gleixner <tglx@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>, Andi Kleen <ak@suse.de>,
linux-kernel@vger.kernel.org
Subject: Re: Immediate values
Date: Thu, 24 Sep 2009 07:16:56 -0700 [thread overview]
Message-ID: <4ABB7F58.5030508@zytor.com> (raw)
In-Reply-To: <20090924140228.GA2648@redhat.com>
Jason Baron wrote:
>
> http://marc.info/?l=linux-kernel&m=125200966226921&w=2
>
> The basic idea is that gcc, 4.5 will have support for an 'asm goto'
> construct which can refer to c code labels. Thus, we can replace a nop
> in the code stream with a 'jmp' instruction to various branch targets.
>
Looking at the above, I'm a bit unclear for the need for a NOP5. We
obviously need a *total* of 5 bytes, but at least I don't seem to
understand why we need 7 bytes per tracepoint.
-hpa
next prev parent reply other threads:[~2009-09-24 14:17 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-24 12:31 Immediate values Mathieu Desnoyers
2009-09-24 12:34 ` Ingo Molnar
2009-09-24 14:02 ` Jason Baron
2009-09-24 14:10 ` H. Peter Anvin
2009-09-24 14:16 ` Mathieu Desnoyers
2009-09-24 19:16 ` Ingo Molnar
2009-09-24 19:34 ` Ingo Molnar
2009-09-25 6:51 ` Arjan van de Ven
2009-09-25 7:35 ` Mathieu Desnoyers
2009-09-25 8:25 ` Arjan van de Ven
2009-09-25 10:02 ` Alan Cox
2009-09-25 10:14 ` Arjan van de Ven
2009-09-25 16:19 ` H. Peter Anvin
2009-09-25 16:45 ` Arjan van de Ven
2009-09-25 17:05 ` H. Peter Anvin
2009-09-25 10:18 ` Richard J Moore
2009-09-25 11:12 ` Masami Hiramatsu
2009-09-24 14:16 ` H. Peter Anvin [this message]
2009-09-24 15:39 ` Jason Baron
2009-09-24 16:52 ` H. Peter Anvin
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