Re: LBR callchains from tracepoints

2016-04-26 Thread Peter Zijlstra
On Tue, Apr 26, 2016 at 03:20:32PM -0300, Arnaldo Carvalho de Melo wrote: > Yeah, and that already works in perf, its just that it doesn't work from some > points (PERF_TYPE_SOFTWARE, PERF_TYPE_TRACEPOINT, etc), as described in the > changeset I mentioned. Look at it the other way around, it _only

Re: LBR callchains from tracepoints

2016-04-26 Thread Arnaldo Carvalho de Melo
Em Tue, Apr 26, 2016 at 10:26:32AM -0700, Alexei Starovoitov escreveu: > On Tue, Apr 26, 2016 at 06:38:28PM +0200, Peter Zijlstra wrote: > > On Mon, Apr 25, 2016 at 10:24:31PM -0300, Arnaldo Carvalho de Melo wrote: > > > Em Mon, Apr 25, 2016 at 10:03:58PM -0300, Arnaldo Carvalho de Melo > > > escr

Re: LBR callchains from tracepoints

2016-04-26 Thread Alexei Starovoitov
On Tue, Apr 26, 2016 at 06:38:28PM +0200, Peter Zijlstra wrote: > On Mon, Apr 25, 2016 at 10:24:31PM -0300, Arnaldo Carvalho de Melo wrote: > > Em Mon, Apr 25, 2016 at 10:03:58PM -0300, Arnaldo Carvalho de Melo escreveu: > > > I now need to continue investigation why this doesn't seem to work from

Re: LBR callchains from tracepoints

2016-04-26 Thread Peter Zijlstra
On Mon, Apr 25, 2016 at 10:24:31PM -0300, Arnaldo Carvalho de Melo wrote: > Em Mon, Apr 25, 2016 at 10:03:58PM -0300, Arnaldo Carvalho de Melo escreveu: > > I now need to continue investigation why this doesn't seem to work from > > tracepoints... > > Bummer, the changeset (at the end of this mess

LBR callchains from tracepoints

2016-04-25 Thread Arnaldo Carvalho de Melo
Em Mon, Apr 25, 2016 at 10:03:58PM -0300, Arnaldo Carvalho de Melo escreveu: > I now need to continue investigation why this doesn't seem to work from > tracepoints... Bummer, the changeset (at the end of this message) hasn't any explanation, is this really impossible? I.e. LBR callstacks from tra