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Groups > linux.kernel > #1179140
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH V3 1/4] perf: Add PERF_RECORD_SWITCH to indicate context switches |
| Date | 2015-07-08 01:00 +0200 |
| Message-ID | <pJK0h-39I-5@gated-at.bofh.it> (permalink) |
| References | (1 earlier) <pJwJI-3ot-19@gated-at.bofh.it> <pJB6G-69E-29@gated-at.bofh.it> <pJBq1-6gd-11@gated-at.bofh.it> <pJD8v-7nV-41@gated-at.bofh.it> <pJDLb-7RF-15@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue, Jul 07, 2015 at 01:13:59PM -0300, Arnaldo Carvalho de Melo wrote: > Em Tue, Jul 07, 2015 at 05:36:14PM +0200, Peter Zijlstra escreveu: > > > To help userspace in places where all it has is the union perf_event, we > > > can reuse one bit in misc to state that, i.e. > > > > #define PERF_RECORD_MISC_SWITCH_NEXT_PREV_PID 14 > > > > For instance. > > > The other option would be a separate RECORD type, which might be > > simpler. > > Humm, do we really need it? > > I think this is just us wanting to, since we are going to add a new > record, to make it more useful for other, not right now needed, > situations, i.e. if the user is priviledged, there are two other options > to get his info, right? I was just thinking that 2 records, each with a fixed layout would be easier to parse than 1 record with variable layout. The record space is immense, so from that point it really doesn't matter. Do whatever is easiest, less mistakes get made etc. :-) No real preference either way, as long we we've thought about it. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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Re: [PATCH V3 1/4] perf: Add PERF_RECORD_SWITCH to indicate context switches Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-07-07 18:20 +0200
Re: [PATCH V3 1/4] perf: Add PERF_RECORD_SWITCH to indicate context switches Peter Zijlstra <peterz@infradead.org> - 2015-07-08 01:00 +0200
Re: [PATCH V3 1/4] perf: Add PERF_RECORD_SWITCH to indicate context switches Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-07-08 15:30 +0200
Re: [PATCH V3 1/4] perf: Add PERF_RECORD_SWITCH to indicate context switches Adrian Hunter <adrian.hunter@intel.com> - 2015-07-08 15:50 +0200
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