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Date: Wed, 14 Oct 2020 18:16:57 +0200
From: Jiri Olsa <jolsa@...hat.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Andi Kleen <andi@...stfloor.org>, jolsa@...nel.org,
linux-kernel@...r.kernel.org, peterz@...radead.org,
Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v2] perf: Add support for exclusive groups/events
On Wed, Oct 14, 2020 at 12:22:12PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Wed, Oct 14, 2020 at 07:42:55AM -0700, Andi Kleen escreveu:
> > Peter suggested that using the exclusive mode in perf could
> > avoid some problems with bad scheduling of groups. Exclusive
> > is implemented in the kernel, but wasn't exposed by the perf tool,
> > so hard to use without custom low level API users.
> >
> > Add support for marking groups or events with :e for exclusive
> > in the perf tool. The implementation is basically the same as the
> > existing pinned attribute.
> >
> > Cc: peterz@...radead.org
> > Signed-off-by: Andi Kleen <ak@...ux.intel.com>
>
> Jiri, I'm taking you "I'm ok" with this as an Acked-by, thanks
yes
Acked-by: Jiri Olsa <jolsa@...hat.com>
thanks,
jirka
>
> - Arnaldo
>
>
> > --
> >
> > v2: Update check_modifier too (Jiri)
> > ---
> > tools/perf/Documentation/perf-list.txt | 1 +
> > tools/perf/tests/parse-events.c | 58 +++++++++++++++++++++++++-
> > tools/perf/util/parse-events.c | 11 ++++-
> > tools/perf/util/parse-events.l | 2 +-
> > 4 files changed, 68 insertions(+), 4 deletions(-)
> >
> > diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
> > index 10ed539a8859..4c7db1da8fcc 100644
> > --- a/tools/perf/Documentation/perf-list.txt
> > +++ b/tools/perf/Documentation/perf-list.txt
> > @@ -58,6 +58,7 @@ counted. The following modifiers exist:
> > S - read sample value (PERF_SAMPLE_READ)
> > D - pin the event to the PMU
> > W - group is weak and will fallback to non-group if not schedulable,
> > + e - group or event are exclusive and do not share the PMU
> >
> > The 'p' modifier can be used for specifying how precise the instruction
> > address should be. The 'p' modifier can be specified multiple times:
> > diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
> > index 7f9f87a470c3..7411dd4d76cf 100644
> > --- a/tools/perf/tests/parse-events.c
> > +++ b/tools/perf/tests/parse-events.c
> > @@ -557,6 +557,7 @@ static int test__checkevent_pmu_events(struct evlist *evlist)
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> > TEST_ASSERT_VAL("wrong pinned", !evsel->core.attr.pinned);
> > + TEST_ASSERT_VAL("wrong exclusive", !evsel->core.attr.exclusive);
> >
> > return 0;
> > }
> > @@ -575,6 +576,7 @@ static int test__checkevent_pmu_events_mix(struct evlist *evlist)
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> > TEST_ASSERT_VAL("wrong pinned", !evsel->core.attr.pinned);
> > + TEST_ASSERT_VAL("wrong exclusive", !evsel->core.attr.exclusive);
> >
> > /* cpu/pmu-event/u*/
> > evsel = evsel__next(evsel);
> > @@ -587,6 +589,7 @@ static int test__checkevent_pmu_events_mix(struct evlist *evlist)
> > TEST_ASSERT_VAL("wrong exclude_hv", evsel->core.attr.exclude_hv);
> > TEST_ASSERT_VAL("wrong precise_ip", !evsel->core.attr.precise_ip);
> > TEST_ASSERT_VAL("wrong pinned", !evsel->core.attr.pinned);
> > + TEST_ASSERT_VAL("wrong exclusive", !evsel->core.attr.pinned);
> >
> > return 0;
> > }
> > @@ -1277,6 +1280,49 @@ static int test__pinned_group(struct evlist *evlist)
> > return 0;
> > }
> >
> > +static int test__checkevent_exclusive_modifier(struct evlist *evlist)
> > +{
> > + struct evsel *evsel = evlist__first(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 precise_ip", evsel->core.attr.precise_ip);
> > + TEST_ASSERT_VAL("wrong exclusive", evsel->core.attr.exclusive);
> > +
> > + return test__checkevent_symbolic_name(evlist);
> > +}
> > +
> > +static int test__exclusive_group(struct evlist *evlist)
> > +{
> > + struct evsel *evsel, *leader;
> > +
> > + TEST_ASSERT_VAL("wrong number of entries", 3 == evlist->core.nr_entries);
> > +
> > + /* cycles - group leader */
> > + evsel = leader = evlist__first(evlist);
> > + TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->core.attr.type);
> > + TEST_ASSERT_VAL("wrong config",
> > + PERF_COUNT_HW_CPU_CYCLES == evsel->core.attr.config);
> > + TEST_ASSERT_VAL("wrong group name", !evsel->group_name);
> > + TEST_ASSERT_VAL("wrong leader", evsel->leader == leader);
> > + TEST_ASSERT_VAL("wrong exclusive", evsel->core.attr.exclusive);
> > +
> > + /* 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",
> > + PERF_COUNT_HW_CACHE_MISSES == evsel->core.attr.config);
> > + TEST_ASSERT_VAL("wrong exclusive", !evsel->core.attr.exclusive);
> > +
> > + /* branch-misses - ditto */
> > + evsel = evsel__next(evsel);
> > + TEST_ASSERT_VAL("wrong config",
> > + PERF_COUNT_HW_BRANCH_MISSES == evsel->core.attr.config);
> > + TEST_ASSERT_VAL("wrong exclusive", !evsel->core.attr.exclusive);
> > +
> > + return 0;
> > +}
> > static int test__checkevent_breakpoint_len(struct evlist *evlist)
> > {
> > struct evsel *evsel = evlist__first(evlist);
> > @@ -1765,7 +1811,17 @@ static struct evlist_test test__events[] = {
> > .name = "cycles:k",
> > .check = test__sym_event_dc,
> > .id = 55,
> > - }
> > + },
> > + {
> > + .name = "instructions:uep",
> > + .check = test__checkevent_exclusive_modifier,
> > + .id = 56,
> > + },
> > + {
> > + .name = "{cycles,cache-misses,branch-misses}:e",
> > + .check = test__exclusive_group,
> > + .id = 57,
> > + },
> > };
> >
> > static struct evlist_test test__events_pmu[] = {
> > diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> > index 9f7260e69113..c4da6bf6ff6a 100644
> > --- a/tools/perf/util/parse-events.c
> > +++ b/tools/perf/util/parse-events.c
> > @@ -1768,6 +1768,7 @@ struct event_modifier {
> > int sample_read;
> > int pinned;
> > int weak;
> > + int exclusive;
> > };
> >
> > static int get_event_modifier(struct event_modifier *mod, char *str,
> > @@ -1783,6 +1784,7 @@ static int get_event_modifier(struct event_modifier *mod, char *str,
> > int precise_max = 0;
> > int sample_read = 0;
> > int pinned = evsel ? evsel->core.attr.pinned : 0;
> > + int exclusive = evsel ? evsel->core.attr.exclusive : 0;
> >
> > int exclude = eu | ek | eh;
> > int exclude_GH = evsel ? evsel->exclude_GH : 0;
> > @@ -1824,6 +1826,8 @@ static int get_event_modifier(struct event_modifier *mod, char *str,
> > sample_read = 1;
> > } else if (*str == 'D') {
> > pinned = 1;
> > + } else if (*str == 'e') {
> > + exclusive = 1;
> > } else if (*str == 'W') {
> > weak = 1;
> > } else
> > @@ -1857,6 +1861,7 @@ static int get_event_modifier(struct event_modifier *mod, char *str,
> > mod->sample_read = sample_read;
> > mod->pinned = pinned;
> > mod->weak = weak;
> > + mod->exclusive = exclusive;
> >
> > return 0;
> > }
> > @@ -1870,7 +1875,7 @@ static int check_modifier(char *str)
> > char *p = str;
> >
> > /* The sizeof includes 0 byte as well. */
> > - if (strlen(str) > (sizeof("ukhGHpppPSDIW") - 1))
> > + if (strlen(str) > (sizeof("ukhGHpppPSDIWe") - 1))
> > return -1;
> >
> > while (*p) {
> > @@ -1912,8 +1917,10 @@ int parse_events__modifier_event(struct list_head *list, char *str, bool add)
> > evsel->precise_max = mod.precise_max;
> > evsel->weak_group = mod.weak;
> >
> > - if (evsel__is_group_leader(evsel))
> > + if (evsel__is_group_leader(evsel)) {
> > evsel->core.attr.pinned = mod.pinned;
> > + evsel->core.attr.exclusive = mod.exclusive;
> > + }
> > }
> >
> > return 0;
> > diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
> > index 3ca5fd2829ca..9db5097317f4 100644
> > --- a/tools/perf/util/parse-events.l
> > +++ b/tools/perf/util/parse-events.l
> > @@ -210,7 +210,7 @@ name_tag [\'][a-zA-Z_*?\[\]][a-zA-Z0-9_*?\-,\.\[\]:=]*[\']
> > name_minus [a-zA-Z_*?][a-zA-Z0-9\-_*?.:]*
> > drv_cfg_term [a-zA-Z0-9_\.]+(=[a-zA-Z0-9_*?\.:]+)?
> > /* If you add a modifier you need to update check_modifier() */
> > -modifier_event [ukhpPGHSDIW]+
> > +modifier_event [ukhpPGHSDIWe]+
> > modifier_bp [rwx]{1,3}
> >
> > %%
> > --
> > 2.28.0
> >
>
> --
>
> - Arnaldo
>
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