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Message-ID: <CAP-5=fV3_UamHcGusUVyo23OW6tRnmSc_tohuDf1KTf4F_os1g@mail.gmail.com>
Date: Thu, 23 Nov 2023 07:18:57 -0800
From: Ian Rogers <irogers@...gle.com>
To: Mark Rutland <mark.rutland@....com>
Cc: Marc Zyngier <maz@...nel.org>, Hector Martin <marcan@...can.st>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Kan Liang <kan.liang@...ux.intel.com>,
James Clark <james.clark@....com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1] perf parse-events: Make legacy events lower
priority than sysfs/json
On Thu, Nov 23, 2023 at 6:37 AM Mark Rutland <mark.rutland@....com> wrote:
>
>
> Hi Ian,
>
> Thanks for this!
>
> On Wed, Nov 22, 2023 at 08:29:22PM -0800, Ian Rogers wrote:
> > The perf tool has previously made legacy events the priority so with
> > or without a PMU the legacy event would be opened:
> >
> > ```
> > $ perf stat -e cpu-cycles,cpu/cpu-cycles/ true
> > Using CPUID GenuineIntel-6-8D-1
> > intel_pt default config: tsc,mtc,mtc_period=3,psb_period=3,pt,branch
> > Attempting to add event pmu 'cpu' with 'cpu-cycles,' that may result in non-fatal errors
> > After aliases, add event pmu 'cpu' with 'cpu-cycles,' that may result in non-fatal errors
> > Control descriptor is not initialized
> > ------------------------------------------------------------
> > perf_event_attr:
> > type 0 (PERF_TYPE_HARDWARE)
> > size 136
> > config 0 (PERF_COUNT_HW_CPU_CYCLES)
> > sample_type IDENTIFIER
> > read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> > disabled 1
> > inherit 1
> > enable_on_exec 1
> > exclude_guest 1
> > ------------------------------------------------------------
> > sys_perf_event_open: pid 833967 cpu -1 group_fd -1 flags 0x8 = 3
> > ------------------------------------------------------------
> > perf_event_attr:
> > type 0 (PERF_TYPE_HARDWARE)
> > size 136
> > config 0 (PERF_COUNT_HW_CPU_CYCLES)
> > sample_type IDENTIFIER
> > read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> > disabled 1
> > inherit 1
> > enable_on_exec 1
> > exclude_guest 1
> > ------------------------------------------------------------
> > ...
> > ```
> >
> > Fixes to make hybrid/BIG.little PMUs behave correctly, ie as core PMUs
> > capable of opening legacy events on each, removing hard coded
> > "cpu_core" and "cpu_atom" Intel PMU names, etc. caused a behavioral
> > difference on Apple/ARM due to latent issues in the PMU driver
> > reported in:
> > https://lore.kernel.org/lkml/08f1f185-e259-4014-9ca4-6411d5c1bc65@marcan.st/
> >
> > As part of that report Mark Rutland <mark.rutland@....com> requested
> > that legacy events not be higher in priority when a PMU is specified
> > reversing what has until this change been perf's default
> > behavior. With this change the above becomes:
> >
> > ```
> > $ perf stat -e cpu-cycles,cpu/cpu-cycles/ true
> > Using CPUID GenuineIntel-6-8D-1
> > Attempt to add: cpu/cpu-cycles=0/
> > ..after resolving event: cpu/event=0x3c/
> > Control descriptor is not initialized
> > ------------------------------------------------------------
> > perf_event_attr:
> > type 0 (PERF_TYPE_HARDWARE)
> > size 136
> > config 0 (PERF_COUNT_HW_CPU_CYCLES)
> > sample_type IDENTIFIER
> > read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> > disabled 1
> > inherit 1
> > enable_on_exec 1
> > exclude_guest 1
> > ------------------------------------------------------------
> > sys_perf_event_open: pid 827628 cpu -1 group_fd -1 flags 0x8 = 3
> > ------------------------------------------------------------
> > perf_event_attr:
> > type 4 (PERF_TYPE_RAW)
> > size 136
> > config 0x3c
> > sample_type IDENTIFIER
> > read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> > disabled 1
> > inherit 1
> > enable_on_exec 1
> > exclude_guest 1
> > ------------------------------------------------------------
> > ...
> > ```
> >
> > So the second event has become a raw event as
> > /sys/devices/cpu/events/cpu-cycles exists.
> >
> > A fix was necessary to config_term_pmu in parse-events.c as
> > check_alias expansion needs to happen after config_term_pmu, and
> > config_term_pmu may need calling a second time because of this.
> >
> > config_term_pmu is updated to not use the legacy event when the PMU
> > has such a named event (either from json or sysfs).
> >
> > The bulk of this change is updating all of the parse-events test
> > expectations so that if a sysfs/json event exists for a PMU the test
> > doesn't fail - a further sign, if it were needed, that the legacy
> > event priority was a known and tested behavior of the perf tool.
> >
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
>
> Regardless of my comments below, for this patch as-is:
>
> Acked-by: Mark Rutland <mark.rutland@....com>
>
> > ---
> > This is a large behavioral change:
> > 1) the scope of the change means it should bake on linux-next and I
> > don't believe should be a 6.7-rc fix.
>
> I'm happy for this to bake, but I do think it needs to be backported for the
> sake of users, especially given that it *restores* the old behaviour.
It is going to change the behavior for a far larger set of users. I'm
also concerned that:
```
$ perf list
...
cpu-cycles OR cpu/cpu-cycles/ [Kernel PMU event]
...
```
implies that cpu/cpu-cycles/ is a synonym for cpu-cycles, which is no
longer true (or pick another event from sysfs whose name is the same
as a legacy event). I'm not sure what a fix in perf list for this
would look like.
Thanks,
Ian
> > 2) a fixes tag and stable backport I don't think are appropriate.
>
> For the sake of users I think a fixes tag and stable backport are necssary. In
> practice distributions ship the perf tool associated with their stable kernel,
> so (for better or worse) a stable backport is certainly necessary for distros
> that'll use the v6.6 stable kernel.
>
> > The real reported issue is with the PMU driver.
>
> Having trawled through the driver and core perf code, I don't believe the PMU
> driver is at fault. Please see my analysis at:
>
> https://lore.kernel.org/lkml/ZV9gThJ52slPHqlV@FVFF77S0Q05N.cambridge.arm.com/
>
> ... where it looks like the perf tool is dropping the extended type ID in some
> cases.
>
> If you know of a specific bug in the PMU driver or perf core code, please let
> me know and I will investigate. As it stands we have no evidence of a bug in
> the PMU driver, and pretty clear evidence (as linked above) there there is
> *some* issue in userspace. In the absence of such evidence, please don't assert
> that there must be a kernel bug.
>
> > A backport would bring the
> > risk that later fixes, due to the large behavior change, wouldn't be
> > backported and past releases get regressed in scenarios like
> > hybrid. Backports for the perf tool are also less necessary than say a
> > buggy PMU driver, as distributions should be updating to the latest
> > perf tool regardless of what Linux kernel is being run (the perf tool
> > is backward compatible).
>
> As above I believe that a backport is necessary.
>
> Thanks,
> Mark.
>
> > ---
> > tools/perf/tests/parse-events.c | 256 +++++++++++++++++++++++---------
> > tools/perf/util/parse-events.c | 52 +++++--
> > tools/perf/util/pmu.c | 8 +-
> > tools/perf/util/pmu.h | 3 +-
> > 4 files changed, 231 insertions(+), 88 deletions(-)
> >
> > diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
> > index e52f45c7c3d1..fbdf710d5eea 100644
> > --- a/tools/perf/tests/parse-events.c
> > +++ b/tools/perf/tests/parse-events.c
> > @@ -162,6 +162,22 @@ static int test__checkevent_numeric(struct evlist *evlist)
> > return TEST_OK;
> > }
> >
> > +
> > +static int assert_hw(struct perf_evsel *evsel, enum perf_hw_id id, const char *name)
> > +{
> > + struct perf_pmu *pmu;
> > +
> > + if (evsel->attr.type == PERF_TYPE_HARDWARE) {
> > + TEST_ASSERT_VAL("wrong config", test_perf_config(evsel, id));
> > + return 0;
> > + }
> > + pmu = perf_pmus__find_by_type(evsel->attr.type);
> > +
> > + TEST_ASSERT_VAL("unexpected PMU type", pmu);
> > + TEST_ASSERT_VAL("PMU missing event", perf_pmu__have_event(pmu, name));
> > + return 0;
> > +}
> > +
> > static int test__checkevent_symbolic_name(struct evlist *evlist)
> > {
> > struct perf_evsel *evsel;
> > @@ -169,10 +185,12 @@ static int test__checkevent_symbolic_name(struct evlist *evlist)
> > TEST_ASSERT_VAL("wrong number of entries", 0 != evlist->core.nr_entries);
> >
> > perf_evlist__for_each_evsel(&evlist->core, evsel) {
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->attr.type);
> > - TEST_ASSERT_VAL("wrong config",
> > - test_perf_config(evsel, PERF_COUNT_HW_INSTRUCTIONS));
> > + int ret = assert_hw(evsel, PERF_COUNT_HW_INSTRUCTIONS, "instructions");
> > +
> > + if (ret)
> > + return ret;
> > }
> > +
> > return TEST_OK;
> > }
> >
> > @@ -183,8 +201,10 @@ static int test__checkevent_symbolic_name_config(struct evlist *evlist)
> > TEST_ASSERT_VAL("wrong number of entries", 0 != evlist->core.nr_entries);
> >
> > perf_evlist__for_each_evsel(&evlist->core, evsel) {
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_perf_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + int ret = assert_hw(evsel, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > +
> > + if (ret)
> > + return ret;
> > /*
> > * The period value gets configured within evlist__config,
> > * while this test executes only parse events method.
> > @@ -861,10 +881,14 @@ static int test__group1(struct evlist *evlist)
> > evlist__nr_groups(evlist) == num_core_entries());
> >
> > for (int i = 0; i < num_core_entries(); i++) {
> > + int ret;
> > +
> > /* instructions:k */
> > evsel = leader = (i == 0 ? evlist__first(evlist) : evsel__next(evsel));
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_INSTRUCTIONS));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_INSTRUCTIONS, "instructions");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > @@ -878,8 +902,10 @@ static int test__group1(struct evlist *evlist)
> >
> > /* cycles:upp */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > @@ -907,6 +933,8 @@ static int test__group2(struct evlist *evlist)
> > TEST_ASSERT_VAL("wrong number of groups", 1 == evlist__nr_groups(evlist));
> >
> > evlist__for_each_entry(evlist, evsel) {
> > + int ret;
> > +
> > if (evsel->core.attr.type == PERF_TYPE_SOFTWARE) {
> > /* faults + :ku modifier */
> > leader = evsel;
> > @@ -939,8 +967,10 @@ static int test__group2(struct evlist *evlist)
> > continue;
> > }
> > /* cycles:k */
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > @@ -957,6 +987,7 @@ static int test__group2(struct evlist *evlist)
> > static int test__group3(struct evlist *evlist __maybe_unused)
> > {
> > struct evsel *evsel, *group1_leader = NULL, *group2_leader = NULL;
> > + int ret;
> >
> > TEST_ASSERT_VAL("wrong number of entries",
> > evlist->core.nr_entries == (3 * perf_pmus__num_core_pmus() + 2));
> > @@ -1045,8 +1076,10 @@ static int test__group3(struct evlist *evlist __maybe_unused)
> > continue;
> > }
> > /* instructions:u */
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_INSTRUCTIONS));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_INSTRUCTIONS, "instructions");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > @@ -1070,10 +1103,14 @@ static int test__group4(struct evlist *evlist __maybe_unused)
> > num_core_entries() == evlist__nr_groups(evlist));
> >
> > for (int i = 0; i < num_core_entries(); i++) {
> > + int ret;
> > +
> > /* cycles:u + p */
> > evsel = leader = (i == 0 ? evlist__first(evlist) : evsel__next(evsel));
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > @@ -1089,8 +1126,10 @@ static int test__group4(struct evlist *evlist __maybe_unused)
> >
> > /* instructions:kp + p */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_INSTRUCTIONS));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_INSTRUCTIONS, "instructions");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > @@ -1108,6 +1147,7 @@ static int test__group4(struct evlist *evlist __maybe_unused)
> > static int test__group5(struct evlist *evlist __maybe_unused)
> > {
> > struct evsel *evsel = NULL, *leader;
> > + int ret;
> >
> > TEST_ASSERT_VAL("wrong number of entries",
> > evlist->core.nr_entries == (5 * num_core_entries()));
> > @@ -1117,8 +1157,10 @@ static int test__group5(struct evlist *evlist __maybe_unused)
> > for (int i = 0; i < num_core_entries(); i++) {
> > /* cycles + G */
> > evsel = leader = (i == 0 ? evlist__first(evlist) : evsel__next(evsel));
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", !evsel->core.attr.exclude_hv);
> > @@ -1133,8 +1175,10 @@ static int test__group5(struct evlist *evlist __maybe_unused)
> >
> > /* instructions + G */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_INSTRUCTIONS));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_INSTRUCTIONS, "instructions");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", !evsel->core.attr.exclude_hv);
> > @@ -1148,8 +1192,10 @@ static int test__group5(struct evlist *evlist __maybe_unused)
> > for (int i = 0; i < num_core_entries(); i++) {
> > /* cycles:G */
> > evsel = leader = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", !evsel->core.attr.exclude_hv);
> > @@ -1164,8 +1210,10 @@ static int test__group5(struct evlist *evlist __maybe_unused)
> >
> > /* instructions:G */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_INSTRUCTIONS));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_INSTRUCTIONS, "instructions");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", !evsel->core.attr.exclude_hv);
> > @@ -1178,8 +1226,10 @@ static int test__group5(struct evlist *evlist __maybe_unused)
> > for (int i = 0; i < num_core_entries(); i++) {
> > /* cycles */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", !evsel->core.attr.exclude_hv);
> > @@ -1201,10 +1251,14 @@ static int test__group_gh1(struct evlist *evlist)
> > evlist__nr_groups(evlist) == num_core_entries());
> >
> > for (int i = 0; i < num_core_entries(); i++) {
> > + int ret;
> > +
> > /* cycles + :H group modifier */
> > evsel = leader = (i == 0 ? evlist__first(evlist) : evsel__next(evsel));
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", !evsel->core.attr.exclude_hv);
> > @@ -1218,8 +1272,10 @@ static int test__group_gh1(struct evlist *evlist)
> >
> > /* cache-misses:G + :H group modifier */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CACHE_MISSES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CACHE_MISSES, "cache-misses");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", !evsel->core.attr.exclude_hv);
> > @@ -1242,10 +1298,14 @@ static int test__group_gh2(struct evlist *evlist)
> > evlist__nr_groups(evlist) == num_core_entries());
> >
> > for (int i = 0; i < num_core_entries(); i++) {
> > + int ret;
> > +
> > /* cycles + :G group modifier */
> > evsel = leader = (i == 0 ? evlist__first(evlist) : evsel__next(evsel));
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", !evsel->core.attr.exclude_hv);
> > @@ -1259,8 +1319,10 @@ static int test__group_gh2(struct evlist *evlist)
> >
> > /* cache-misses:H + :G group modifier */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CACHE_MISSES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CACHE_MISSES, "cache-misses");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", !evsel->core.attr.exclude_hv);
> > @@ -1283,10 +1345,14 @@ static int test__group_gh3(struct evlist *evlist)
> > evlist__nr_groups(evlist) == num_core_entries());
> >
> > for (int i = 0; i < num_core_entries(); i++) {
> > + int ret;
> > +
> > /* cycles:G + :u group modifier */
> > evsel = leader = (i == 0 ? evlist__first(evlist) : evsel__next(evsel));
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > @@ -1300,8 +1366,10 @@ static int test__group_gh3(struct evlist *evlist)
> >
> > /* cache-misses:H + :u group modifier */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CACHE_MISSES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CACHE_MISSES, "cache-misses");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > @@ -1324,10 +1392,14 @@ static int test__group_gh4(struct evlist *evlist)
> > evlist__nr_groups(evlist) == num_core_entries());
> >
> > for (int i = 0; i < num_core_entries(); i++) {
> > + int ret;
> > +
> > /* cycles:G + :uG group modifier */
> > evsel = leader = (i == 0 ? evlist__first(evlist) : evsel__next(evsel));
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > @@ -1341,8 +1413,10 @@ static int test__group_gh4(struct evlist *evlist)
> >
> > /* cache-misses:H + :uG group modifier */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CACHE_MISSES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CACHE_MISSES, "cache-misses");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > @@ -1363,10 +1437,14 @@ static int test__leader_sample1(struct evlist *evlist)
> > evlist->core.nr_entries == (3 * num_core_entries()));
> >
> > for (int i = 0; i < num_core_entries(); i++) {
> > + int ret;
> > +
> > /* cycles - sampling group leader */
> > evsel = leader = (i == 0 ? evlist__first(evlist) : evsel__next(evsel));
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", !evsel->core.attr.exclude_hv);
> > @@ -1379,8 +1457,10 @@ static int test__leader_sample1(struct evlist *evlist)
> >
> > /* cache-misses - not sampling */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CACHE_MISSES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CACHE_MISSES, "cache-misses");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", !evsel->core.attr.exclude_hv);
> > @@ -1392,8 +1472,10 @@ static int test__leader_sample1(struct evlist *evlist)
> >
> > /* branch-misses - not sampling */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_BRANCH_MISSES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_BRANCH_MISSES, "branch-misses");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", !evsel->core.attr.exclude_hv);
> > @@ -1415,10 +1497,14 @@ static int test__leader_sample2(struct evlist *evlist __maybe_unused)
> > evlist->core.nr_entries == (2 * num_core_entries()));
> >
> > for (int i = 0; i < num_core_entries(); i++) {
> > + int ret;
> > +
> > /* instructions - sampling group leader */
> > evsel = leader = (i == 0 ? evlist__first(evlist) : evsel__next(evsel));
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_INSTRUCTIONS));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_INSTRUCTIONS, "instructions");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > @@ -1431,8 +1517,10 @@ static int test__leader_sample2(struct evlist *evlist __maybe_unused)
> >
> > /* branch-misses - not sampling */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_BRANCH_MISSES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_BRANCH_MISSES, "branch-misses");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclude_user", !evsel->core.attr.exclude_user);
> > TEST_ASSERT_VAL("wrong exclude_kernel", evsel->core.attr.exclude_kernel);
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > @@ -1472,10 +1560,14 @@ static int test__pinned_group(struct evlist *evlist)
> > evlist->core.nr_entries == (3 * num_core_entries()));
> >
> > for (int i = 0; i < num_core_entries(); i++) {
> > + int ret;
> > +
> > /* cycles - group leader */
> > evsel = leader = (i == 0 ? evlist__first(evlist) : evsel__next(evsel));
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong group name", !evsel->group_name);
> > TEST_ASSERT_VAL("wrong leader", evsel__has_leader(evsel, leader));
> > /* TODO: The group modifier is not copied to the split group leader. */
> > @@ -1484,13 +1576,18 @@ static int test__pinned_group(struct evlist *evlist)
> >
> > /* cache-misses - can not be pinned, but will go on with the leader */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CACHE_MISSES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CACHE_MISSES, "cache-misses");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong pinned", !evsel->core.attr.pinned);
> >
> > /* branch-misses - ditto */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_BRANCH_MISSES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_BRANCH_MISSES, "branch-misses");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong pinned", !evsel->core.attr.pinned);
> > }
> > return TEST_OK;
> > @@ -1517,10 +1614,14 @@ static int test__exclusive_group(struct evlist *evlist)
> > evlist->core.nr_entries == 3 * num_core_entries());
> >
> > for (int i = 0; i < num_core_entries(); i++) {
> > + int ret;
> > +
> > /* cycles - group leader */
> > evsel = leader = (i == 0 ? evlist__first(evlist) : evsel__next(evsel));
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong group name", !evsel->group_name);
> > TEST_ASSERT_VAL("wrong leader", evsel__has_leader(evsel, leader));
> > /* TODO: The group modifier is not copied to the split group leader. */
> > @@ -1529,13 +1630,18 @@ static int test__exclusive_group(struct evlist *evlist)
> >
> > /* cache-misses - can not be pinned, but will go on with the leader */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CACHE_MISSES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_CACHE_MISSES, "cache-misses");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclusive", !evsel->core.attr.exclusive);
> >
> > /* branch-misses - ditto */
> > evsel = evsel__next(evsel);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_BRANCH_MISSES));
> > + ret = assert_hw(&evsel->core, PERF_COUNT_HW_BRANCH_MISSES, "branch-misses");
> > + if (ret)
> > + return ret;
> > +
> > TEST_ASSERT_VAL("wrong exclusive", !evsel->core.attr.exclusive);
> > }
> > return TEST_OK;
> > @@ -1677,9 +1783,11 @@ static int test__checkevent_raw_pmu(struct evlist *evlist)
> > static int test__sym_event_slash(struct evlist *evlist)
> > {
> > struct evsel *evsel = evlist__first(evlist);
> > + int ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > +
> > + if (ret)
> > + return ret;
> >
> > - TEST_ASSERT_VAL("wrong type", evsel->core.attr.type == PERF_TYPE_HARDWARE);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > TEST_ASSERT_VAL("wrong exclude_kernel", evsel->core.attr.exclude_kernel);
> > return TEST_OK;
> > }
> > @@ -1687,9 +1795,11 @@ static int test__sym_event_slash(struct evlist *evlist)
> > static int test__sym_event_dc(struct evlist *evlist)
> > {
> > struct evsel *evsel = evlist__first(evlist);
> > + int ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > +
> > + if (ret)
> > + return ret;
> >
> > - TEST_ASSERT_VAL("wrong type", evsel->core.attr.type == PERF_TYPE_HARDWARE);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > TEST_ASSERT_VAL("wrong exclude_user", evsel->core.attr.exclude_user);
> > return TEST_OK;
> > }
> > @@ -1697,9 +1807,11 @@ static int test__sym_event_dc(struct evlist *evlist)
> > static int test__term_equal_term(struct evlist *evlist)
> > {
> > struct evsel *evsel = evlist__first(evlist);
> > + int ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > +
> > + if (ret)
> > + return ret;
> >
> > - TEST_ASSERT_VAL("wrong type", evsel->core.attr.type == PERF_TYPE_HARDWARE);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > TEST_ASSERT_VAL("wrong name setting", strcmp(evsel->name, "name") == 0);
> > return TEST_OK;
> > }
> > @@ -1707,9 +1819,11 @@ static int test__term_equal_term(struct evlist *evlist)
> > static int test__term_equal_legacy(struct evlist *evlist)
> > {
> > struct evsel *evsel = evlist__first(evlist);
> > + int ret = assert_hw(&evsel->core, PERF_COUNT_HW_CPU_CYCLES, "cycles");
> > +
> > + if (ret)
> > + return ret;
> >
> > - TEST_ASSERT_VAL("wrong type", evsel->core.attr.type == PERF_TYPE_HARDWARE);
> > - TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
> > TEST_ASSERT_VAL("wrong name setting", strcmp(evsel->name, "l1d") == 0);
> > return TEST_OK;
> > }
> > diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> > index aa2f5c6fc7fc..767aa718faa5 100644
> > --- a/tools/perf/util/parse-events.c
> > +++ b/tools/perf/util/parse-events.c
> > @@ -976,7 +976,7 @@ static int config_term_pmu(struct perf_event_attr *attr,
> > struct parse_events_error *err)
> > {
> > if (term->type_term == PARSE_EVENTS__TERM_TYPE_LEGACY_CACHE) {
> > - const struct perf_pmu *pmu = perf_pmus__find_by_type(attr->type);
> > + struct perf_pmu *pmu = perf_pmus__find_by_type(attr->type);
> >
> > if (!pmu) {
> > char *err_str;
> > @@ -986,15 +986,23 @@ static int config_term_pmu(struct perf_event_attr *attr,
> > err_str, /*help=*/NULL);
> > return -EINVAL;
> > }
> > - if (perf_pmu__supports_legacy_cache(pmu)) {
> > + /*
> > + * Rewrite the PMU event to a legacy cache one unless the PMU
> > + * doesn't support legacy cache events or the event is present
> > + * within the PMU.
> > + */
> > + if (perf_pmu__supports_legacy_cache(pmu) &&
> > + !perf_pmu__have_event(pmu, term->config)) {
> > attr->type = PERF_TYPE_HW_CACHE;
> > return parse_events__decode_legacy_cache(term->config, pmu->type,
> > &attr->config);
> > - } else
> > + } else {
> > term->type_term = PARSE_EVENTS__TERM_TYPE_USER;
> > + term->no_value = true;
> > + }
> > }
> > if (term->type_term == PARSE_EVENTS__TERM_TYPE_HARDWARE) {
> > - const struct perf_pmu *pmu = perf_pmus__find_by_type(attr->type);
> > + struct perf_pmu *pmu = perf_pmus__find_by_type(attr->type);
> >
> > if (!pmu) {
> > char *err_str;
> > @@ -1004,10 +1012,19 @@ static int config_term_pmu(struct perf_event_attr *attr,
> > err_str, /*help=*/NULL);
> > return -EINVAL;
> > }
> > - attr->type = PERF_TYPE_HARDWARE;
> > - attr->config = term->val.num;
> > - if (perf_pmus__supports_extended_type())
> > - attr->config |= (__u64)pmu->type << PERF_PMU_TYPE_SHIFT;
> > + /*
> > + * If the PMU has a sysfs or json event prefer it over
> > + * legacy. ARM requires this.
> > + */
> > + if (perf_pmu__have_event(pmu, term->config)) {
> > + term->type_term = PARSE_EVENTS__TERM_TYPE_USER;
> > + term->no_value = true;
> > + } else {
> > + attr->type = PERF_TYPE_HARDWARE;
> > + attr->config = term->val.num;
> > + if (perf_pmus__supports_extended_type())
> > + attr->config |= (__u64)pmu->type << PERF_PMU_TYPE_SHIFT;
> > + }
> > return 0;
> > }
> > if (term->type_term == PARSE_EVENTS__TERM_TYPE_USER ||
> > @@ -1381,6 +1398,7 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
> > YYLTYPE *loc = loc_;
> > LIST_HEAD(config_terms);
> > struct parse_events_terms parsed_terms;
> > + bool alias_rewrote_terms;
> >
> > pmu = parse_state->fake_pmu ?: perf_pmus__find(name);
> >
> > @@ -1433,7 +1451,15 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
> > return evsel ? 0 : -ENOMEM;
> > }
> >
> > - if (!parse_state->fake_pmu && perf_pmu__check_alias(pmu, &parsed_terms, &info, err)) {
> > + /* Configure attr/terms with a known PMU, this will set hardcoded terms. */
> > + if (config_attr(&attr, &parsed_terms, parse_state->error, config_term_pmu)) {
> > + parse_events_terms__exit(&parsed_terms);
> > + return -EINVAL;
> > + }
> > +
> > + /* Look for event names in the terms and rewrite into format based terms. */
> > + if (!parse_state->fake_pmu && perf_pmu__check_alias(pmu, &parsed_terms,
> > + &info, &alias_rewrote_terms, err)) {
> > parse_events_terms__exit(&parsed_terms);
> > return -EINVAL;
> > }
> > @@ -1447,11 +1473,9 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
> > strbuf_release(&sb);
> > }
> >
> > - /*
> > - * Configure hardcoded terms first, no need to check
> > - * return value when called with fail == 0 ;)
> > - */
> > - if (config_attr(&attr, &parsed_terms, parse_state->error, config_term_pmu)) {
> > + /* Configure attr/terms again if an alias was expanded. */
> > + if (alias_rewrote_terms &&
> > + config_attr(&attr, &parsed_terms, parse_state->error, config_term_pmu)) {
> > parse_events_terms__exit(&parsed_terms);
> > return -EINVAL;
> > }
> > diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> > index d3c9aa4326be..3c9609944a2f 100644
> > --- a/tools/perf/util/pmu.c
> > +++ b/tools/perf/util/pmu.c
> > @@ -1494,12 +1494,14 @@ static int check_info_data(struct perf_pmu *pmu,
> > * defined for the alias
> > */
> > int perf_pmu__check_alias(struct perf_pmu *pmu, struct parse_events_terms *head_terms,
> > - struct perf_pmu_info *info, struct parse_events_error *err)
> > + struct perf_pmu_info *info, bool *rewrote_terms,
> > + struct parse_events_error *err)
> > {
> > struct parse_events_term *term, *h;
> > struct perf_pmu_alias *alias;
> > int ret;
> >
> > + *rewrote_terms = false;
> > info->per_pkg = false;
> >
> > /*
> > @@ -1521,7 +1523,7 @@ int perf_pmu__check_alias(struct perf_pmu *pmu, struct parse_events_terms *head_
> > NULL);
> > return ret;
> > }
> > -
> > + *rewrote_terms = true;
> > ret = check_info_data(pmu, alias, info, err, term->err_term);
> > if (ret)
> > return ret;
> > @@ -1615,6 +1617,8 @@ bool perf_pmu__auto_merge_stats(const struct perf_pmu *pmu)
> >
> > bool perf_pmu__have_event(struct perf_pmu *pmu, const char *name)
> > {
> > + if (!name)
> > + return false;
> > if (perf_pmu__find_alias(pmu, name, /*load=*/ true) != NULL)
> > return true;
> > if (pmu->cpu_aliases_added || !pmu->events_table)
> > diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
> > index d2895d415f08..424c3fee0949 100644
> > --- a/tools/perf/util/pmu.h
> > +++ b/tools/perf/util/pmu.h
> > @@ -201,7 +201,8 @@ int perf_pmu__config_terms(const struct perf_pmu *pmu,
> > __u64 perf_pmu__format_bits(struct perf_pmu *pmu, const char *name);
> > int perf_pmu__format_type(struct perf_pmu *pmu, const char *name);
> > int perf_pmu__check_alias(struct perf_pmu *pmu, struct parse_events_terms *head_terms,
> > - struct perf_pmu_info *info, struct parse_events_error *err);
> > + struct perf_pmu_info *info, bool *rewrote_terms,
> > + struct parse_events_error *err);
> > int perf_pmu__find_event(struct perf_pmu *pmu, const char *event, void *state, pmu_event_callback cb);
> >
> > int perf_pmu__format_parse(struct perf_pmu *pmu, int dirfd, bool eager_load);
> > --
> > 2.43.0.rc1.413.gea7ed67945-goog
> >
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