Messages in this thread | | | Date | Wed, 25 May 2022 08:00:45 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH V4 00/15] perf intel-pt: Better support for perf record --cpu |
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Em Tue, May 24, 2022 at 10:01:01PM -0700, Ian Rogers escreveu: > On Tue, May 24, 2022 at 12:55 AM Adrian Hunter <adrian.hunter@intel.com> wrote: > > > > Hi > > > > Here are V4 patches to support capturing Intel PT sideband events such as > > mmap, task, context switch, text poke etc, on every CPU even when tracing > > selected user_requested_cpus. That is, when using the perf record -C or > > --cpu option. > > > > This is needed for: > > 1. text poke: a text poke on any CPU affects all CPUs > > 2. tracing user space: a user space process can migrate between CPUs so > > mmap events that happen on a different CPU can be needed to decode a > > user_requested_cpus CPU. > > > > For example: > > > > Trace on CPU 1: > > > > perf record --kcore -C 1 -e intel_pt// & > > > > Start a task on CPU 0: > > > > taskset 0x1 testprog & > > > > Migrate it to CPU 1: > > > > taskset -p 0x2 <testprog pid> > > > > Stop tracing: > > > > kill %1 > > > > Prior to these changes there will be errors decoding testprog > > in userspace because the comm and mmap events for testprog will not > > have been captured. > > > > There is quite a bit of preparation: > > > > The first patch is a small Intel PT test for system-wide side band. The > > test fails before the patches are applied, passed afterwards. > > > > perf intel-pt: Add a test for system-wide side band [new in V1] > > > > The next 5 patches (now already applied) stop auxtrace mixing up mmap idx > > between evlist and evsel. That is going to matter when > > evlist->all_cpus != evlist->user_requested_cpus != evsel->cpus: > > > > libperf evsel: Factor out perf_evsel__ioctl() [now applied] > > libperf evsel: Add perf_evsel__enable_thread() > > perf evlist: Use libperf functions in evlist__enable_event_idx() > > perf auxtrace: Move evlist__enable_event_idx() to auxtrace.c > > perf auxtrace: Do not mix up mmap idx > > > > The next 6 patches (first 4 now already applied) stop attempts to auxtrace > > mmap when it is not an auxtrace event e.g. when mmapping the CPUs on which > > only sideband is captured: > > > > libperf evlist: Remove ->idx() per_cpu parameter > > libperf evlist: Move ->idx() into mmap_per_evsel() > > libperf evlist: Add evsel as a parameter to ->idx() > > perf auxtrace: Record whether an auxtrace mmap is needed > > perf auxctrace: Add mmap_needed to auxtrace_mmap_params > > perf auxtrace: Remove auxtrace_mmap_params__set_idx() per_cpu parameter > > > > The next 5 patches switch to setting up dummy event maps before adding the > > evsel so that the evsel is subject to map propagation, primarily to cause > > addition of the evsel's CPUs to all_cpus. > > > > perf evlist: Factor out evlist__dummy_event() > > perf evlist: Add evlist__add_system_wide_dummy() > > perf record: Use evlist__add_system_wide_dummy() in record__config_text_poke() > > perf intel-pt: Use evlist__add_system_wide_dummy() for switch tracking > > perf intel-pt: Track sideband system-wide when needed > > > > The remaining patches make more significant changes. > > > > First change from using user_requested_cpus to using all_cpus where necessary: > > > > perf tools: Allow all_cpus to be a superset of user_requested_cpus > > > > Secondly, mmap all per-thread and all per-cpu events: > > > > libperf evlist: Allow mixing per-thread and per-cpu mmaps > > libperf evlist: Check nr_mmaps is correct [new in V1] > > > > Stop using system_wide flag for uncore because it will not work anymore: > > > > perf stat: Add requires_cpu flag for uncore > > libperf evsel: Add comments for booleans [new in V1] > > > > Finally change map propagation so that system-wide events retain their cpus and > > (dummy) threads: > > > > perf tools: Allow system-wide events to keep their own CPUs > > perf tools: Allow system-wide events to keep their own threads > > > > > > Changes in V4: > > > > Added Acked-by: Namhyung Kim <namhyung@kernel.org> > > Added a couple Acked-by: Ian Rogers <irogers@google.com> > > Would love to see this merged Arnaldo, I can do an: > > Acked-by: Ian Rogers <irogers@google.com> > > in case it helps you with b4 a little :-)
I'll add your Acked-by manually now to the patches missing it, as I had merged this yesterday.
- Arnaldo
> Thanks, > Ian > > > perf intel-pt: Add a test for system-wide side band > > Put in commit message that test succeeds only after other > > patches applied > > > > libperf evsel: Add perf_evsel__enable_thread() > > perf evlist: Use libperf functions in evlist__enable_event_idx() > > perf auxtrace: Move evlist__enable_event_idx() to auxtrace.c > > perf auxtrace: Do not mix up mmap idx > > libperf evlist: Remove ->idx() per_cpu parameter > > libperf evlist: Move ->idx() into mmap_per_evsel() > > libperf evlist: Add evsel as a parameter to ->idx() > > perf auxtrace: Record whether an auxtrace mmap is needed > > Omitted because already applied > > > > libperf evsel: Add comments for booleans > > Amended comment about own_cpus > > > > > > Changes in V3: > > > > perf auxtrace: Add mmap_needed to auxtrace_mmap_params > > Amended mmap_needed comment > > > > perf evlist: Add evlist__add_dummy_on_all_cpus() > > Amended comment about all CPUs. > > > > > > Changes in V2: > > > > Added some Acked-by: Ian Rogers <irogers@google.com> > > > > libperf evsel: Add perf_evsel__enable_thread() > > Use perf_cpu_map__for_each_cpu() > > > > perf auxtrace: Add mmap_needed to auxtrace_mmap_params > > Add documentation comment for mmap_needed > > > > perf auxtrace: Remove auxtrace_mmap_params__set_idx() per_cpu parameter > > Fix missing auxtrace_mmap_params__set_idx change > > > > libperf evlist: Check nr_mmaps is correct > > Remove unused code > > > > libperf evsel: Add comments for booleans > > Amend comments > > > > perf evlist: Add evlist__add_dummy_on_all_cpus() > > Rename evlist__add_system_wide -> evlist__add_on_all_cpus > > Changed patch subject accordingly > > > > perf record: Use evlist__add_dummy_on_all_cpus() in record__config_text_poke() > > Rename evlist__add_system_wide -> evlist__add_on_all_cpus > > Changed patch subject accordingly > > > > perf intel-pt: Use evlist__add_dummy_on_all_cpus() for switch tracking > > Rename evlist__add_system_wide -> evlist__add_on_all_cpus > > Changed patch subject accordingly > > > > > > Changes in V1: > > > > perf intel-pt: Add a test for system-wide side band > > New patch > > > > libperf evsel: Factor out perf_evsel__ioctl() > > Dropped because it has been applied. > > > > libperf evsel: Add perf_evsel__enable_thread() > > Rename variable i -> idx > > > > perf auxtrace: Do not mix up mmap idx > > Rename variable cpu to cpu_map_idx > > > > perf tools: Allow all_cpus to be a superset of user_requested_cpus > > Add Acked-by: Ian Rogers <irogers@google.com> > > > > libperf evlist: Allow mixing per-thread and per-cpu mmaps > > Fix perf_evlist__nr_mmaps() calculation > > > > libperf evlist: Check nr_mmaps is correct > > New patch > > > > libperf evsel: Add comments for booleans > > New patch > > > > perf tools: Allow system-wide events to keep their own CPUs > > perf tools: Allow system-wide events to keep their own threads > > > > > > Adrian Hunter (15): > > perf intel-pt: Add a test for system-wide side band > > perf auxtrace: Add mmap_needed to auxtrace_mmap_params > > perf auxtrace: Remove auxtrace_mmap_params__set_idx() per_cpu parameter > > perf evlist: Factor out evlist__dummy_event() > > perf evlist: Add evlist__add_dummy_on_all_cpus() > > perf record: Use evlist__add_dummy_on_all_cpus() in record__config_text_poke() > > perf intel-pt: Use evlist__add_dummy_on_all_cpus() for switch tracking > > perf intel-pt: Track sideband system-wide when needed > > perf tools: Allow all_cpus to be a superset of user_requested_cpus > > libperf evlist: Allow mixing per-thread and per-cpu mmaps > > libperf evlist: Check nr_mmaps is correct > > perf stat: Add requires_cpu flag for uncore > > libperf evsel: Add comments for booleans > > perf tools: Allow system-wide events to keep their own CPUs > > perf tools: Allow system-wide events to keep their own threads > > > > tools/lib/perf/evlist.c | 71 ++++++++++++++------------------- > > tools/lib/perf/include/internal/evsel.h | 11 +++++ > > tools/perf/arch/x86/util/intel-pt.c | 31 ++++++-------- > > tools/perf/builtin-record.c | 39 +++++++----------- > > tools/perf/builtin-stat.c | 5 +-- > > tools/perf/tests/shell/test_intel_pt.sh | 71 +++++++++++++++++++++++++++++++++ > > tools/perf/util/auxtrace.c | 15 +++++-- > > tools/perf/util/auxtrace.h | 13 ++++-- > > tools/perf/util/evlist.c | 61 +++++++++++++++++++++++++--- > > tools/perf/util/evlist.h | 5 +++ > > tools/perf/util/evsel.c | 1 + > > tools/perf/util/mmap.c | 4 +- > > tools/perf/util/parse-events.c | 2 +- > > 13 files changed, 226 insertions(+), 103 deletions(-) > > create mode 100755 tools/perf/tests/shell/test_intel_pt.sh > > > > > > Regards > > Adrian
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- Arnaldo
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