From: Andi Kleen <andi@firstfloor.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Theodore Tso <tytso@mit.edu>,
Arjan van de Ven <arjan@infradead.org>,
Steven Rostedt <srostedt@redhat.com>
Subject: Re: [PATCH 4/4] trace: profile all if conditionals
Date: Sun, 23 Nov 2008 20:43:07 +0100 [thread overview]
Message-ID: <87iqqei5ys.fsf@basil.nowhere.org> (raw)
In-Reply-To: <20081121071328.462456268@goodmis.org> (Steven Rostedt's message of "Fri, 21 Nov 2008 02:12:17 -0500")
Steven Rostedt <rostedt@goodmis.org> writes:
>
> Miss means the branch was not taken. Hit means the branch was taken.
> The percent is the percentage the branch was taken.
I'm not sure the results are very useful? What would
you do with it?
It seems like a very special case of gcov, but I think I would
rather have the full thing (patches in -mm I think)
> This adds a significant amount of overhead and should only be used
> by those analyzing their system.
Often this can be also done using CPU performance counters. Might
be a cheaper option.
-Andi
--
ak@linux.intel.com
next prev parent reply other threads:[~2008-11-23 19:43 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-21 7:12 [PATCH 0/4] trace: profiling branches Steven Rostedt
2008-11-21 7:12 ` [PATCH 1/4] trace: remove extra assign in branch check Steven Rostedt
2008-11-21 7:12 ` [PATCH 2/4] trace: consolidate unlikely and likely profiler Steven Rostedt
2008-11-21 7:12 ` [PATCH 3/4] trace: branch profiling should not print percent without data Steven Rostedt
2008-11-21 7:12 ` [PATCH 4/4] trace: profile all if conditionals Steven Rostedt
2008-11-21 23:20 ` Andrew Morton
2008-11-21 23:33 ` Steven Rostedt
2008-11-23 12:37 ` Ingo Molnar
2008-11-23 15:48 ` Ingo Molnar
2008-11-23 16:07 ` [PATCH] net/wireless/reg.c: fix Ingo Molnar
2008-11-23 19:43 ` Andi Kleen [this message]
2008-11-23 19:56 ` [PATCH 4/4] trace: profile all if conditionals Steven Rostedt
2008-11-23 20:24 ` Andi Kleen
2008-11-23 20:32 ` Steven Rostedt
2008-11-23 20:51 ` Andi Kleen
2008-11-23 21:38 ` Ingo Molnar
2008-11-30 10:58 ` [PATCH 0/4] trace: profiling branches Daniel Walker
2008-11-30 15:19 ` Steven Rostedt
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