perf test: Add event group test for events in multiple PMUs

Multiple events in a group can belong to one or more PMUs, however
there are some limitations.

One of the limitations is that perf doesn't allow creating a group of
events from different hw PMUs.

Write a simple test to create various combinations of hw, sw and uncore
PMU events and verify group creation succeeds or fails as expected.

Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Acked-by: Ian Rogers <irogers@google.com>
Acked-by: Kan Liang <kan.liang@linux.intel.com>
Acked-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ananth Narayan <ananth.narayan@amd.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Carsten Haitzler <carsten.haitzler@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Santosh Shukla <santosh.shukla@amd.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Link: https://lore.kernel.org/r/20221206043237.12159-3-ravi.bangoria@amd.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ravi Bangoria 2022-12-06 10:02:37 +05:30 committed by Arnaldo Carvalho de Melo
parent 336b92da1a
commit 9d9b22beda
4 changed files with 130 additions and 0 deletions

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@ -67,6 +67,7 @@ perf-y += expand-cgroup.o
perf-y += perf-time-to-tsc.o
perf-y += dlfilter-test.o
perf-y += sigtrap.o
perf-y += event_groups.o
$(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c tests/Build
$(call rule_mkdir)

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@ -110,6 +110,7 @@ static struct test_suite *generic_tests[] = {
&suite__perf_time_to_tsc,
&suite__dlfilter,
&suite__sigtrap,
&suite__event_groups,
NULL,
};

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@ -0,0 +1,127 @@
// SPDX-License-Identifier: GPL-2.0
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include "linux/perf_event.h"
#include "tests.h"
#include "debug.h"
#include "pmu.h"
#include "pmus.h"
#include "header.h"
#include "../perf-sys.h"
/* hw: cycles, sw: context-switch, uncore: [arch dependent] */
static int types[] = {0, 1, -1};
static unsigned long configs[] = {0, 3, 0};
#define NR_UNCORE_PMUS 5
/* Uncore pmus that support more than 3 counters */
static struct uncore_pmus {
const char *name;
__u64 config;
} uncore_pmus[NR_UNCORE_PMUS] = {
{ "amd_l3", 0x0 },
{ "amd_df", 0x0 },
{ "uncore_imc_0", 0x1 }, /* Intel */
{ "core_imc", 0x318 }, /* PowerPC: core_imc/CPM_STCX_FIN/ */
{ "hv_24x7", 0x22000000003 }, /* PowerPC: hv_24x7/CPM_STCX_FIN/ */
};
static int event_open(int type, unsigned long config, int group_fd)
{
struct perf_event_attr attr;
memset(&attr, 0, sizeof(struct perf_event_attr));
attr.type = type;
attr.size = sizeof(struct perf_event_attr);
attr.config = config;
/*
* When creating an event group, typically the group leader is
* initialized with disabled set to 1 and any child events are
* initialized with disabled set to 0. Despite disabled being 0,
* the child events will not start until the group leader is
* enabled.
*/
attr.disabled = group_fd == -1 ? 1 : 0;
return sys_perf_event_open(&attr, -1, 0, group_fd, 0);
}
static int setup_uncore_event(void)
{
struct perf_pmu *pmu;
int i;
if (list_empty(&pmus))
perf_pmu__scan(NULL);
perf_pmus__for_each_pmu(pmu) {
for (i = 0; i < NR_UNCORE_PMUS; i++) {
if (!strcmp(uncore_pmus[i].name, pmu->name)) {
pr_debug("Using %s for uncore pmu event\n", pmu->name);
types[2] = pmu->type;
configs[2] = uncore_pmus[i].config;
return 0;
}
}
}
return -1;
}
static int run_test(int i, int j, int k)
{
int erroneous = ((((1 << i) | (1 << j) | (1 << k)) & 5) == 5);
int group_fd, sibling_fd1, sibling_fd2;
group_fd = event_open(types[i], configs[i], -1);
if (group_fd == -1)
return -1;
sibling_fd1 = event_open(types[j], configs[j], group_fd);
if (sibling_fd1 == -1) {
close(group_fd);
return erroneous ? 0 : -1;
}
sibling_fd2 = event_open(types[k], configs[k], group_fd);
if (sibling_fd2 == -1) {
close(sibling_fd1);
close(group_fd);
return erroneous ? 0 : -1;
}
close(sibling_fd2);
close(sibling_fd1);
close(group_fd);
return erroneous ? -1 : 0;
}
static int test__event_groups(struct test_suite *text __maybe_unused, int subtest __maybe_unused)
{
int i, j, k;
int ret;
int r;
ret = setup_uncore_event();
if (ret || types[2] == -1)
return TEST_SKIP;
ret = TEST_OK;
for (i = 0; i < 3; i++) {
for (j = 0; j < 3; j++) {
for (k = 0; k < 3; k++) {
r = run_test(i, j, k);
if (r)
ret = TEST_FAIL;
pr_debug("0x%x 0x%lx, 0x%x 0x%lx, 0x%x 0x%lx: %s\n",
types[i], configs[i], types[j], configs[j],
types[k], configs[k], r ? "Fail" : "Pass");
}
}
}
return ret;
}
DEFINE_SUITE("Event groups", event_groups);

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@ -147,6 +147,7 @@ DECLARE_SUITE(expand_cgroup_events);
DECLARE_SUITE(perf_time_to_tsc);
DECLARE_SUITE(dlfilter);
DECLARE_SUITE(sigtrap);
DECLARE_SUITE(event_groups);
/*
* PowerPC and S390 do not support creation of instruction breakpoints using the