Re: [PATCH 1/2] tracing/core: introduce per cpu tracing files

On Wed, Feb 25, 2009 at 02:02:02PM +0100, Ingo Molnar wrote:

* Frederic Weisbecker <fweisbec@xxxxxxxxx> wrote:

Impact: split up tracing output per cpu

So this patch creates a new directory inside /debug/tracing
(provided you have a debugfs mountpoint on /debug). Inside
this directory, you will now find one trace_pipe file, one
trace file and one latency_trace file per cpu. Which means if
you have two cpus, you will have:

trace0
trace1
trace_pipe0
trace_pipe1

Very nice! I've applied your patches to tip:tracing/ftrace.

Could you please do one more tweak? The /debug/tracing/per_cpu/
directory looks a bit cluttered on a 16-way box. It would be a
nicer structure to have per CPU directories, i.e.:

/debug/tracing/per_cpu/cpu0/trace
/debug/tracing/per_cpu/cpu0/trace_pipe
/debug/tracing/per_cpu/cpu1/trace
/debug/tracing/per_cpu/cpu1/trace_pipe

etc.

Ah right, the only SMP machine I have has two CPU so I didn't
think about that.


Besides being easier to handle, this also makes it easy to
extend the list of per CPU attributes as well, without
cluttering the /debug/tracing/per_cpu/ directory.

Ingo


You're right, I will change that.

Thanks.

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