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Date: Sat, 9 Apr 2011 15:17:02 +0200 From: Ingo Molnar <mingo@...e.hu> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: Frederic Weisbecker <fweisbec@...il.com>, LKML <linux-kernel@...r.kernel.org>, Arnaldo Carvalho de Melo <acme@...hat.com>, Paul Mackerras <paulus@...ba.org>, Stephane Eranian <eranian@...gle.com> Subject: Re: [PATCH] perf: Don't schedule tracepoints when exclude_kernel is set * Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote: > On Fri, 2011-04-08 at 22:57 +0200, Frederic Weisbecker wrote: > > Instead of checking attr.exclude_kernel anytime a tracepoint > > event triggers, simply don't schedule the tracepoint it that > > attribute is set. This makes one test less in the tracing > > path. > > Meh, I'd much rather someone spend some time on finishing the below, > which is a much bigger improvement for trace-events. > > --- > Subject: perf: Tracepoint collection support > From: Peter Zijlstra <a.p.zijlstra@...llo.nl> > Date: Sat Nov 20 18:09:34 CET 2010 > > Due to popular demand this implements a tracepoint collection event > { .type = PERF_TYPE_TRACEPOINT, .config = ~0ULL }. by default it > contains no tracepoints, but tracepoints can be added using: > ioctl(fd, PERF_EVENT_IOC_ADD_TP, tp_id); +1 !!! This is like a super-important feature. Thanks, Ingo -- 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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