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Message-ID: <CAM9d7chw5ABt1qpnMV49JW8ZdHtzPR5GAJwHT1+sgzZe0Q9FLA@mail.gmail.com>
Date: Wed, 4 Sep 2024 08:43:08 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Ian Rogers <irogers@...gle.com>, Kan Liang <kan.liang@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>,
Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>,
LKML <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org,
Ravi Bangoria <ravi.bangoria@....com>, Mark Rutland <mark.rutland@....com>,
James Clark <james.clark@....com>, Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
Kajol Jain <kjain@...ux.ibm.com>, Thomas Richter <tmricht@...ux.ibm.com>,
Atish Patra <atishp@...shpatra.org>, Palmer Dabbelt <palmer@...osinc.com>,
Mingwei Zhang <mizhang@...gle.com>, James Clark <james.clark@...aro.org>
Subject: Re: [PATCH 1/8] perf tools: Don't set attr.exclude_guest by default
Hi Arnaldo,
On Wed, Sep 4, 2024 at 6:07 AM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
> On Tue, Sep 03, 2024 at 11:41:24PM -0700, Namhyung Kim wrote:
> > The exclude_guest in the event attribute is to limit profiling in the
> > host environment. But I'm not sure why we want to set it by default
> > cause we don't care about it in most cases and I feel like it just
> > makes new PMU implementation complicated.
> >
> > Of course it's useful for perf kvm command so I added the
> > exclude_GH_default variable to preserve the old behavior for perf kvm
> > and other commands like perf record and stat won't set the exclude bit.
> > This is helpful for AMD IBS case since having exclude_guest bit will
> > clear new feature bit due to the missing feature check logic.
> >
> > $ sysctl kernel.perf_event_paranoid
> > kernel.perf_event_paranoid = 0
> >
> > $ perf record -W -e ibs_op// -vv true 2>&1 | grep switching
> > switching off PERF_FORMAT_LOST support
> > switching off weight struct support
> > switching off bpf_event
> > switching off ksymbol
> > switching off cloexec flag
> > switching off mmap2
> > switching off exclude_guest, exclude_host
> >
> > Maybe Apple M1 users will scream but actually the default event for
> > perf record was converted to "cycles:P" which doesn't set the
> > exclude_guest bit already. So they need to specify the necessary
> > modifier manually like "cycles:PH" and I think it's ok.
>
> Would be really, really good to have a Tested-by: Someone # on an Apple M1
Yep, and other non-x86 platforms too.
>
> I'll reinstall my rk-3399-pc and try it on that hybrid aarch64 board.
>
> I have access to Ampere Altra systems, will try there as well.
Great, thanks!
Namhyung
>
> - Arnaldo
>
> > Intestingly, I found it sets the exclude_bit if "u" modifier is used.
> > I don't know why but it's neither intuitive nor consistent. Let's
> > remove the bit there too.
> >
> > Cc: Mark Rutland <mark.rutland@....com>
> > Cc: James Clark <james.clark@...aro.org>
> > Cc: Ravi Bangoria <ravi.bangoria@....com>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> > tools/perf/builtin-kvm.c | 1 +
> > tools/perf/tests/attr/test-record-dummy-C0 | 2 +-
> > tools/perf/tests/parse-events.c | 18 +++++++++---------
> > tools/perf/util/parse-events.c | 2 +-
> > tools/perf/util/util.c | 10 ++++++++--
> > tools/perf/util/util.h | 3 +++
> > 6 files changed, 23 insertions(+), 13 deletions(-)
> >
> > diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
> > index 692267b1b7e8311f..ca94dd3de04d34a3 100644
> > --- a/tools/perf/builtin-kvm.c
> > +++ b/tools/perf/builtin-kvm.c
> > @@ -2147,6 +2147,7 @@ int cmd_kvm(int argc, const char **argv)
> > "buildid-list", "stat", NULL };
> > const char *kvm_usage[] = { NULL, NULL };
> >
> > + exclude_HG_default = true;
> > perf_host = 0;
> > perf_guest = 1;
> >
> > diff --git a/tools/perf/tests/attr/test-record-dummy-C0 b/tools/perf/tests/attr/test-record-dummy-C0
> > index 576ec48b3aafaa6a..8ce6f0a5df5b7013 100644
> > --- a/tools/perf/tests/attr/test-record-dummy-C0
> > +++ b/tools/perf/tests/attr/test-record-dummy-C0
> > @@ -37,7 +37,7 @@ precise_ip=0
> > mmap_data=0
> > sample_id_all=1
> > exclude_host=0
> > -exclude_guest=1
> > +exclude_guest=0
> > exclude_callchain_kernel=0
> > exclude_callchain_user=0
> > mmap2=1
> > diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
> > index edc2adcf1baed195..9179bf3084c302c1 100644
> > --- a/tools/perf/tests/parse-events.c
> > +++ b/tools/perf/tests/parse-events.c
> > @@ -932,7 +932,7 @@ static int test__group2(struct evlist *evlist)
> > 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);
> > - TEST_ASSERT_VAL("wrong exclude guest", evsel->core.attr.exclude_guest);
> > + TEST_ASSERT_VAL("wrong exclude guest", !evsel->core.attr.exclude_guest);
> > TEST_ASSERT_VAL("wrong exclude host", !evsel->core.attr.exclude_host);
> > TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> > TEST_ASSERT_VAL("wrong leader", evsel__is_group_leader(evsel));
> > @@ -947,7 +947,7 @@ static int test__group2(struct evlist *evlist)
> > 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);
> > - TEST_ASSERT_VAL("wrong exclude guest", evsel->core.attr.exclude_guest);
> > + TEST_ASSERT_VAL("wrong exclude guest", !evsel->core.attr.exclude_guest);
> > TEST_ASSERT_VAL("wrong exclude host", !evsel->core.attr.exclude_host);
> > TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> > if (evsel__has_leader(evsel, leader))
> > @@ -1072,7 +1072,7 @@ static int test__group3(struct evlist *evlist __maybe_unused)
> > 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);
> > - TEST_ASSERT_VAL("wrong exclude guest", evsel->core.attr.exclude_guest);
> > + TEST_ASSERT_VAL("wrong exclude guest", !evsel->core.attr.exclude_guest);
> > TEST_ASSERT_VAL("wrong exclude host", !evsel->core.attr.exclude_host);
> > TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> > TEST_ASSERT_VAL("wrong leader", evsel__is_group_leader(evsel));
> > @@ -1222,7 +1222,7 @@ static int test__group5(struct evlist *evlist __maybe_unused)
> > 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);
> > - TEST_ASSERT_VAL("wrong exclude guest", evsel->core.attr.exclude_guest);
> > + TEST_ASSERT_VAL("wrong exclude guest", !evsel->core.attr.exclude_guest);
> > TEST_ASSERT_VAL("wrong exclude host", !evsel->core.attr.exclude_host);
> > TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> > TEST_ASSERT_VAL("wrong leader", evsel__is_group_leader(evsel));
> > @@ -1437,7 +1437,7 @@ static int test__leader_sample1(struct evlist *evlist)
> > 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);
> > - TEST_ASSERT_VAL("wrong exclude guest", evsel->core.attr.exclude_guest);
> > + TEST_ASSERT_VAL("wrong exclude guest", !evsel->core.attr.exclude_guest);
> > TEST_ASSERT_VAL("wrong exclude host", !evsel->core.attr.exclude_host);
> > TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> > TEST_ASSERT_VAL("wrong group name", !evsel->group_name);
> > @@ -1453,7 +1453,7 @@ static int test__leader_sample1(struct evlist *evlist)
> > 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);
> > - TEST_ASSERT_VAL("wrong exclude guest", evsel->core.attr.exclude_guest);
> > + TEST_ASSERT_VAL("wrong exclude guest", !evsel->core.attr.exclude_guest);
> > TEST_ASSERT_VAL("wrong exclude host", !evsel->core.attr.exclude_host);
> > TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> > TEST_ASSERT_VAL("wrong leader", evsel__has_leader(evsel, leader));
> > @@ -1468,7 +1468,7 @@ static int test__leader_sample1(struct evlist *evlist)
> > 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);
> > - TEST_ASSERT_VAL("wrong exclude guest", evsel->core.attr.exclude_guest);
> > + TEST_ASSERT_VAL("wrong exclude guest", !evsel->core.attr.exclude_guest);
> > TEST_ASSERT_VAL("wrong exclude host", !evsel->core.attr.exclude_host);
> > TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> > TEST_ASSERT_VAL("wrong group name", !evsel->group_name);
> > @@ -1497,7 +1497,7 @@ static int test__leader_sample2(struct evlist *evlist __maybe_unused)
> > 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);
> > - TEST_ASSERT_VAL("wrong exclude guest", evsel->core.attr.exclude_guest);
> > + TEST_ASSERT_VAL("wrong exclude guest", !evsel->core.attr.exclude_guest);
> > TEST_ASSERT_VAL("wrong exclude host", !evsel->core.attr.exclude_host);
> > TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> > TEST_ASSERT_VAL("wrong group name", !evsel->group_name);
> > @@ -1513,7 +1513,7 @@ static int test__leader_sample2(struct evlist *evlist __maybe_unused)
> > 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);
> > - TEST_ASSERT_VAL("wrong exclude guest", evsel->core.attr.exclude_guest);
> > + TEST_ASSERT_VAL("wrong exclude guest", !evsel->core.attr.exclude_guest);
> > TEST_ASSERT_VAL("wrong exclude host", !evsel->core.attr.exclude_host);
> > TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> > TEST_ASSERT_VAL("wrong group name", !evsel->group_name);
> > diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> > index fab01ba54e34da7d..ab73b3d45f0467f9 100644
> > --- a/tools/perf/util/parse-events.c
> > +++ b/tools/perf/util/parse-events.c
> > @@ -1739,7 +1739,7 @@ static int parse_events__modifier_list(struct parse_events_state *parse_state,
> > if (mod.user) {
> > if (!exclude)
> > exclude = eu = ek = eh = 1;
> > - if (!exclude_GH && !perf_guest)
> > + if (!exclude_GH && !perf_guest && exclude_HG_default)
> > eG = 1;
> > eu = 0;
> > }
> > diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
> > index 9d55a13787ce3c05..7e3159faaa1991df 100644
> > --- a/tools/perf/util/util.c
> > +++ b/tools/perf/util/util.c
> > @@ -78,17 +78,23 @@ bool sysctl__nmi_watchdog_enabled(void)
> >
> > bool test_attr__enabled;
> >
> > +bool exclude_HG_default;
> > +
> > bool perf_host = true;
> > bool perf_guest = false;
> >
> > void event_attr_init(struct perf_event_attr *attr)
> > {
> > + /* to capture ABI version */
> > + attr->size = sizeof(*attr);
> > +
> > + if (!exclude_HG_default)
> > + return;
> > +
> > if (!perf_host)
> > attr->exclude_host = 1;
> > if (!perf_guest)
> > attr->exclude_guest = 1;
> > - /* to capture ABI version */
> > - attr->size = sizeof(*attr);
> > }
> >
> > int mkdir_p(char *path, mode_t mode)
> > diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
> > index 9966c21aaf048479..d33ae883a54f2f2f 100644
> > --- a/tools/perf/util/util.h
> > +++ b/tools/perf/util/util.h
> > @@ -21,6 +21,9 @@ extern const char perf_more_info_string[];
> >
> > extern const char *input_name;
> >
> > +/* This will control if perf_{host,guest} will set attr.exclude_{host,guest}. */
> > +extern bool exclude_HG_default;
> > +
> > extern bool perf_host;
> > extern bool perf_guest;
> >
> > --
> > 2.46.0.469.g59c65b2a67-goog
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