From: "Frédéric Weisbecker" <fweisbec@gmail.com>
To: "Steven Rostedt" <rostedt@goodmis.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
"Ingo Molnar" <mingo@elte.hu>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Peter Zijlstra" <peterz@infradead.org>,
"Arnaldo Carvalho de Melo" <acme@ghostprotocols.net>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Linus Torvalds" <torvalds@linux-foundation.org>,
"Arjan van de Ven" <arjan@infradead.org>
Subject: Re: [PATCH][RFC] ftrace: function oprofiler
Date: Sat, 25 Oct 2008 12:51:39 +0200 [thread overview]
Message-ID: <c62985530810250351u40b671afg2fada687ee1d62f4@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.1.10.0810250130020.27727@gandalf.stny.rr.com>
Hi Steven,
2008/10/25 Steven Rostedt <rostedt@goodmis.org>:
> # cat /debug/tracing/ftrace_profile | sort -brn | head -20
> 280075 : __rcu_read_unlock+0xb/0xa2
> 280065 : __rcu_read_lock+0x11/0xb3
The rcu function are on top of this profile. May be it's because you use
rcu when you touch your hash table.
Wouldn't be interesting to disable the counter adding for these
functions when they
are used at this time?
> +config FUNCTION_PROFILER
> + bool "Trace max stack"
Copy-paste error? :-)
next prev parent reply other threads:[~2008-10-25 10:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-25 5:55 Steven Rostedt
2008-10-25 10:51 ` Frédéric Weisbecker [this message]
2008-10-25 13:50 ` Steven Rostedt
2008-10-26 0:55 ` [PATCH v2][RFC] " Steven Rostedt
2008-10-26 10:35 ` Peter Zijlstra
2008-10-26 13:58 ` Steven Rostedt
2008-10-26 14:25 ` Paul E. McKenney
2008-10-26 14:20 ` Arjan van de Ven
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