Messages in this thread Patch in this message | | | From | Ravi Bangoria <> | Subject | [PATCH] perf test: Add event group test | Date | Fri, 25 Nov 2022 08:50:18 +0530 |
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Multiple events in a group can belong to one or more pmus, however there are some limitations to it. Basically, 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> --- Note: Uncore pmu event detail for Intel, Arm, PowerPC and s390 needs to be verified/fixed. These are marked as XXX in the patch.
tools/perf/tests/Build | 1 + tools/perf/tests/builtin-test.c | 1 + tools/perf/tests/event_groups.c | 126 ++++++++++++++++++++++++++++++++ tools/perf/tests/tests.h | 1 + 4 files changed, 129 insertions(+) create mode 100644 tools/perf/tests/event_groups.c
diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build index 2064a640facb..9a59d451ca44 100644 --- a/tools/perf/tests/Build +++ b/tools/perf/tests/Build @@ -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) diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c index 7122eae1d98d..48cd0c809cb1 100644 --- a/tools/perf/tests/builtin-test.c +++ b/tools/perf/tests/builtin-test.c @@ -110,6 +110,7 @@ static struct test_suite *generic_tests[] = { &suite__perf_time_to_tsc, &suite__dlfilter, &suite__sigtrap, + &suite__event_groups, NULL, }; diff --git a/tools/perf/tests/event_groups.c b/tools/perf/tests/event_groups.c new file mode 100644 index 000000000000..92486b68cadb --- /dev/null +++ b/tools/perf/tests/event_groups.c @@ -0,0 +1,126 @@ +// 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 "header.h" +#include "../perf-sys.h" + +static int event_open(int type, unsigned long config, int g_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; + attr.disabled = g_fd == -1 ? 1 : 0; + + return sys_perf_event_open(&attr, -1, 0, g_fd, 0); +} + +/* hw: cycles, sw: context-switch, uncore: [arch dependent] */ +int type[] = {0, 1, -1}; +unsigned long config[] = {0, 3, -1}; + +static int setup_uncore_event(void) +{ + char pmu_name[25] = {0}; + struct perf_pmu *pmu; + +#if defined(__x86_64__) || defined(__i386__) +{ + char buf[128] = {0}; + + if (get_cpuid(buf, sizeof(buf))) + return -1; + if (strstr(buf, "Intel")) { + strcpy(pmu_name, "uncore_imc_0"); /* XXX */ + config[2] = 0xff04; + } else { + strcpy(pmu_name, "amd_l3"); + config[2] = 0xff04; /* l3_cache_accesses */ + } +} +#elif defined(__arm__) || defined(__aarch64__) + strcpy(pmu_name, "l2c_220"); /* XXX */ + config[2] = 0x0; +#elif defined(__powerpc__) + strcpy(pmu_name, "hv_24x7"); /* XXX */ + config[2] = 0x0; +#elif defined(__s390x__) + strcpy(pmu_name, "pai_crypto"); /* XXX */ + config[2] = 0x0; +#else + pr_debug("No uncore pmu event found\n"); + return -1; +#endif + + pmu = perf_pmu__find(pmu_name); + if (!pmu) { + pr_debug("Can not find uncore pmu\n"); + return -1; + } + type[2] = pmu->type; + return 0; +} + +static int run_test(int i, int j, int k) +{ + int erroneous = ((((1 << i) | (1 << j) | (1 << k)) & 5) == 5); + int fd1, fd2, fd3; + + fd1 = event_open(type[i], config[i], -1); + if (fd1 == -1) + return -1; + + fd2 = event_open(type[j], config[j], fd1); + if (fd2 == -1) { + close(fd1); + return erroneous ? 0 : -1; + } + + fd3 = event_open(type[k], config[k], fd1); + if (fd3 == -1) { + close(fd1); + close(fd2); + return erroneous ? 0 : -1; + } + + close(fd1); + close(fd2); + close(fd3); + 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 || type[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", + type[i], config[i], type[j], config[j], + type[k], config[k], r ? "Fail" : "Pass"); + } + } + } + return ret; +} + +DEFINE_SUITE("Event groups", event_groups); diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h index 5bbb8f6a48fc..08570b5505d7 100644 --- a/tools/perf/tests/tests.h +++ b/tools/perf/tests/tests.h @@ -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 -- 2.38.1
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