Messages in this thread | | | Date | Mon, 28 Apr 2008 17:39:56 +0200 | From | Ingo Molnar <> | Subject | Re: ftrace and debugfs weird interaction |
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* 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 > 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. > > 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 ?
hm. Cc:-ed more ftrace developers.
Ingo
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