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<r...@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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
