From: Andi Kleen <andi@firstfloor.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: "Andi Kleen" <andi@firstfloor.org>,
"Frédéric Weisbecker" <fweisbec@gmail.com>,
"Ingo Molnar" <mingo@elte.hu>,
"Linux Kernel" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] tracing/function-return-tracer: Make the function return tracer lockless
Date: Thu, 13 Nov 2008 19:55:15 +0100 [thread overview]
Message-ID: <20081113185515.GA3810@one.firstfloor.org> (raw)
In-Reply-To: <alpine.DEB.1.10.0811131330350.23751@gandalf.stny.rr.com>
> Now tell me again how local_* is more efficient than barrier?
Look at the generated assembler, not the source. The M386 check is two instructions
with the i386 stuff just moved away somewhere out of line that is
about never taken. The rest is short and straight forward in asm too.
And a lot of kernels are not compiled with 386 support anyways.
-Andi
--
ak@linux.intel.com
next prev parent reply other threads:[~2008-11-13 18:46 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-12 21:47 [PATCH 1/2] tracing/function-return-tracer: Make the function return tracer lockless Frederic Weisbecker
2008-11-12 22:15 ` Ingo Molnar
2008-11-13 8:50 ` Frédéric Weisbecker
2008-11-13 8:55 ` Ingo Molnar
2008-11-13 9:16 ` Frédéric Weisbecker
2008-11-13 9:23 ` Ingo Molnar
2008-11-13 9:27 ` Frédéric Weisbecker
2008-11-13 9:40 ` Ingo Molnar
2008-11-13 12:36 ` Frédéric Weisbecker
2008-11-13 12:54 ` Ingo Molnar
2008-11-13 12:59 ` Peter Zijlstra
2008-11-13 13:02 ` Ingo Molnar
2008-11-13 17:26 ` Frédéric Weisbecker
2008-11-13 18:57 ` Ingo Molnar
2008-11-13 20:06 ` Frédéric Weisbecker
2008-11-13 14:53 ` Andi Kleen
2008-11-13 17:01 ` Frédéric Weisbecker
2008-11-13 17:12 ` Andi Kleen
2008-11-13 17:21 ` Steven Rostedt
2008-11-13 17:34 ` Andi Kleen
2008-11-13 17:32 ` Steven Rostedt
2008-11-13 17:46 ` Frédéric Weisbecker
2008-11-13 18:29 ` Andi Kleen
2008-11-13 18:35 ` Steven Rostedt
2008-11-13 18:55 ` Andi Kleen [this message]
2008-11-13 19:03 ` Steven Rostedt
2008-11-13 19:19 ` Andi Kleen
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