Messages in this thread | | | Date | Mon, 28 Apr 2008 16:34:11 -0400 | From | Mathieu Desnoyers <> | Subject | Re: ftrace and debugfs weird interaction |
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* Pekka Paalanen (pq@iki.fi) 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 > > Wait a minute, are you literally running the command: > echo 1>tracing_enabled > > If you are, you just echoed only a newline and directed stdout, stream 1, > to the file. No? :-) > > Could you try with a space: > echo 1 > tracing_enabled > > > > 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. > > Stream 0 is stdin, so... not sure what this would do. Probably nothing, > just like you experienced. >
*duh*. Ok. That wasn't smart. You spotted the problem. Thanks a lot :)
Mathieu
> > Thanks. > > -- > Pekka Paalanen > http://www.iki.fi/pq/
-- Mathieu Desnoyers OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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