Messages in this thread | | | Date | Sat, 26 Apr 2008 14:54:03 -0400 | From | Mathieu Desnoyers <> | Subject | ftrace and debugfs weird interaction |
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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 ?
Mathieu
-- Mathieu Desnoyers OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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