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    SubjectRe: [PATCH] tracing: Export key trace event symbols
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    On Thu, 2015-04-23 at 16:28 +0100, Pawel Moll wrote:
    > On Wed, 2015-04-22 at 16:36 +0100, David Ahern wrote:
    > > On 4/22/15 8:47 AM, Arnaldo Carvalho de Melo wrote:
    > > > Em Wed, Apr 22, 2015 at 08:53:14AM -0400, Steven Rostedt escreveu:
    > > >> >On Tue, 21 Apr 2015 21:24:51 -0500
    > > >> >Ron Rechenmacher<ron@fnal.gov> wrote:
    > > >>> > >I've looked at the above reference briefly and it appears that user-space
    > > >>> > >would be mmapping the buffer read-only. Is that correct?
    > > >> >
    > > >> >Correct, but I'm sure we could still add something (if it doesn't
    > > >> >already exist) to have userspace write into the buffer. Ftrace has that
    > > >> >with the trace_marker file.
    > > > There is something in the works, I guess Pawell Moll (sp) was working on it, and
    > > > David Ahern (CCed) should know, David?
    > > >
    > >
    > > I played around with generating perf events in userspace with the
    > > intention of having the userspace events get merged with kernel events
    > > during the processing stage, but I did not take it to the point of
    > > integrating into perf. This was around October 2013. I got distracted
    > > with other topics and have not come back to it.
    > >
    > > Pawel has a patch that allows userspace to inject events into the stream
    > > via ioctl calls.
    >
    > In the last version it was even a prctl - no need for a perf file
    > descriptor any more :-)
    >
    > But the patch requires more care if it's to go in, so I'm open to people
    > screaming "yes, we need it!" ;-)

    Forgot to quote the link:

    http://article.gmane.org/gmane.linux.kernel.api/5851

    Pawel



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