linux-kernel - RE: [patch 4/5] x86, ftrace, hw-branch-tracer: reset trace on close

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Date:	Fri, 16 Jan 2009 16:19:25 +0000
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	Steven Rostedt <srostedt@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"markus.t.metzger@...il.com" <markus.t.metzger@...il.com>
Subject: RE: [patch 4/5] x86, ftrace, hw-branch-tracer: reset trace on close

>-----Original Message-----
>From: Steven Rostedt [mailto:srostedt@...hat.com]
>Sent: Friday, January 16, 2009 4:02 PM
>To: Metzger, Markus T

>On Fri, 2009-01-16 at 12:01 +0100, Markus Metzger wrote:
>> Reset the ftrace buffer on close. Since we use cyclic buffers to store
>> the trace, the trace is not contiguous, anyway. This behaviour should
>> be more natural.
>
>So you want multiple reads of /debug/tracing/trace to return different
>output? Kind of like the trace_pipe? But trace_pipe is a real consumer.

Yes.
The trace chunks are not contiguous (in this version), so it does not make sense to append them.
I don't expect trace_pipe to work with the hw-branch-tracer.


>BTW, can you run your diff with the -p option. This will help in knowing
>which function the change is in. There's some hunks where it is
>ambiguous. If you use quilt, you can add:
>
>  QUILT_DIFF_OPTS='-p'
>
>to you .quiltrc file.

Thanks.

markus.
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