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Message-ID: <20080428223535.4fe2aeca@daedalus.pq.iki.fi> Date: Mon, 28 Apr 2008 22:35:35 +0300 From: Pekka Paalanen <pq@....fi> To: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> Cc: Ingo Molnar <mingo@...e.hu>, Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org> Subject: Re: ftrace and debugfs weird interaction > * Mathieu Desnoyers <mathieu.desnoyers@...ymtl.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. Thanks. -- Pekka Paalanen http://www.iki.fi/pq/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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