On 8/12/23 19:24, Adrian Hunter wrote:
> Hi
>
> Hardware traces, such as instruction traces, can produce a vast amount of
> trace data, so being able to reduce tracing to more specific circumstances
> can be useful.
>
> The ability to pause or resume tracing when another event happens, can do
> that.
>
> These patches add such a facilty and show how it would work for Intel
> Processor Trace.
>
> Maintainers of other AUX area tracing implementations are requested to
> consider if this is something they might employ and then whether or not
> the ABI would work for them.
>
> Changes to perf tools are not fleshed out yet.
>
>
> Changes in RFC V2:
>
> Use ->stop() / ->start() instead of ->pause_resume()
> Move aux_start_paused bit into aux_output_cfg
> Tighten up when Intel PT pause / resume is allowed
> Add an example of how it might work for CoreSight
Any comments?
>
>
> Adrian Hunter (4):
> perf/core: Add aux_pause, aux_resume, aux_start_paused
> perf/x86/intel/pt: Add support for pause / resume
> perf tools: Add support for AUX area pause / resume
> coresight: Have a stab at support for pause / resume
>
> arch/x86/events/intel/pt.c | 63 ++++++++++++++++++++-
> arch/x86/events/intel/pt.h | 4 ++
> drivers/hwtracing/coresight/coresight-etm-perf.c | 29 ++++++++--
> include/linux/perf_event.h | 15 +++++
> include/uapi/linux/perf_event.h | 11 +++-
> kernel/events/core.c | 72 +++++++++++++++++++++++-
> kernel/events/internal.h | 1 +
> tools/include/uapi/linux/perf_event.h | 11 +++-
> tools/perf/util/auxtrace.c | 4 ++
> tools/perf/util/evsel.c | 9 +++
> tools/perf/util/evsel_config.h | 6 ++
> tools/perf/util/parse-events.c | 33 +++++++++++
> tools/perf/util/parse-events.h | 3 +
> tools/perf/util/parse-events.l | 3 +
> tools/perf/util/perf_event_attr_fprintf.c | 3 +
> 15 files changed, 255 insertions(+), 12 deletions(-)
>
>
> Regards
> Adrian