Messages in this thread | | | Date | Mon, 28 Apr 2008 15:27:21 -0400 (EDT) | From | Steven Rostedt <> | Subject | Re: ftrace and debugfs weird interaction |
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5BOn Mon, 28 Apr 2008, Ingo Molnar wrote:
> > * Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> wrote: > > > Hi, > > > > When trying to figure out what was going on with the sched tracer > > "tracing_enabled" file (sched-devel.git tree), I fell on this strange > > behavior : > > > > echo 1>tracing_enabled seems _not_ to send 1 to the tracing_ctrl_write
It should actually send "1" and not 1 (and technically "1\n") ;-)
> > callback. However, sending garbage, e.g. echo s> tracing_enabled, > > correctly sends the 's' character down the chain. echo 0>tracing_enabled > > sometimes results in the callback not even being called.
I haven't seen this. Perhaps I'm confused about what you are seeing.
> > > > The debugfs file has been created with > > > > entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, > > &global_trace, &tracing_ctrl_fops); > > if (!entry) > > pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); > > > > I wonder what kind of weird debugfs interaction we might have here ?
This looks normal to me. Could you provide a bit more detail to what you are doing, what the results are, and what you expect the restults to be?
> > hm. Cc:-ed more ftrace developers.
Thanks,
-- Steve
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