From: Ingo Molnar <mingo@elte.hu>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Chris Mason <chris.mason@oracle.com>
Subject: Re: [PATCH 0/2] ftrace: updates to tip
Date: Fri, 16 Jan 2009 17:03:07 +0100 [thread overview]
Message-ID: <20090116160307.GA16612@elte.hu> (raw)
In-Reply-To: <20090116160202.GA15209@elte.hu>
* Ingo Molnar <mingo@elte.hu> wrote:
> > [...] We can register a function to be traced via the function
> > pointer, and we can pick which functions to trace, but we can not
> > separate out different functions for different traces.
>
> Why not? We could have a hash of all traced functions with metadata
> attached. Since patching functions in/out would be a relatively rare
> operation, this would be a highly efficient read-mostly hash.
We could build that hash when registering the tracer. Via recordmcount we
have advance knowledge of all the functions that may be traced.
Ingo
next prev parent reply other threads:[~2009-01-16 16:03 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-16 0:40 [PATCH 0/2] ftrace: updates to tip Steven Rostedt
2009-01-16 0:40 ` [PATCH 1/2] ftrace: fix trace_output Steven Rostedt
2009-01-16 1:40 ` Andrew Morton
2009-01-16 1:46 ` Steven Rostedt
2009-01-16 0:40 ` [PATCH 2/2] ftrace: add stack trace to function tracer Steven Rostedt
2009-01-16 0:48 ` Steven Rostedt
2009-01-16 10:08 ` Frédéric Weisbecker
2009-01-16 14:28 ` Steven Rostedt
2009-01-16 11:19 ` Ingo Molnar
2009-01-16 11:23 ` [PATCH 0/2] ftrace: updates to tip Ingo Molnar
2009-01-16 13:08 ` Frédéric Weisbecker
2009-01-16 13:10 ` Ingo Molnar
2009-01-16 14:32 ` Steven Rostedt
2009-01-16 15:21 ` Ingo Molnar
2009-01-16 15:53 ` Steven Rostedt
2009-01-16 16:02 ` Ingo Molnar
2009-01-16 16:03 ` Ingo Molnar [this message]
2009-01-16 16:22 ` Steven Rostedt
2009-01-16 16:30 ` Ingo Molnar
2009-01-16 22:59 ` Ingo Molnar
2009-01-17 1:14 ` Steven Rostedt
2009-01-17 13:48 ` Frederic Weisbecker
2009-01-17 22:34 ` Ingo Molnar
2009-01-18 7:27 ` Ingo Molnar
2009-01-16 21:47 ` Chris Mason
2009-01-16 22:26 ` Ingo Molnar
2009-01-17 1:30 ` Chris Mason
2009-01-17 2:38 ` Arnaldo Carvalho de Melo
2009-01-19 13:31 ` Ingo Molnar
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