81f17c90f1
This way we'll be able to pass more test specific parameters without having to change this function signature. Will be used by the upcoming 'shell tests', shell scripts that will call perf tools and check if they work as expected, comparing its effects on the system (think 'perf probe foo') the output produced, etc. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Thomas Richter <tmricht@linux.vnet.ibm.com> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-wq250w7j1opbzyiynozuajbl@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
#include "tests/tests.h"
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#include "perf.h"
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#include "cloexec.h"
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#include "debug.h"
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#include "evlist.h"
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#include "evsel.h"
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#include "arch-tests.h"
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#include <signal.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <string.h>
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static pid_t spawn(void)
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{
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pid_t pid;
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pid = fork();
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if (pid)
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return pid;
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while(1)
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sleep(5);
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return 0;
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}
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/*
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* Create an event group that contains both a sampled hardware
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* (cpu-cycles) and software (intel_cqm/llc_occupancy/) event. We then
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* wait for the hardware perf counter to overflow and generate a PMI,
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* which triggers an event read for both of the events in the group.
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*
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* Since reading Intel CQM event counters requires sending SMP IPIs, the
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* CQM pmu needs to handle the above situation gracefully, and return
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* the last read counter value to avoid triggering a WARN_ON_ONCE() in
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* smp_call_function_many() caused by sending IPIs from NMI context.
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*/
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int test__intel_cqm_count_nmi_context(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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struct perf_evlist *evlist = NULL;
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struct perf_evsel *evsel = NULL;
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struct perf_event_attr pe;
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int i, fd[2], flag, ret;
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size_t mmap_len;
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void *event;
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pid_t pid;
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int err = TEST_FAIL;
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flag = perf_event_open_cloexec_flag();
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evlist = perf_evlist__new();
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if (!evlist) {
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pr_debug("perf_evlist__new failed\n");
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return TEST_FAIL;
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}
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ret = parse_events(evlist, "intel_cqm/llc_occupancy/", NULL);
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if (ret) {
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pr_debug("parse_events failed, is \"intel_cqm/llc_occupancy/\" available?\n");
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err = TEST_SKIP;
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goto out;
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}
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evsel = perf_evlist__first(evlist);
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if (!evsel) {
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pr_debug("perf_evlist__first failed\n");
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goto out;
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}
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memset(&pe, 0, sizeof(pe));
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pe.size = sizeof(pe);
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pe.type = PERF_TYPE_HARDWARE;
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pe.config = PERF_COUNT_HW_CPU_CYCLES;
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pe.read_format = PERF_FORMAT_GROUP;
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pe.sample_period = 128;
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pe.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_READ;
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pid = spawn();
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fd[0] = sys_perf_event_open(&pe, pid, -1, -1, flag);
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if (fd[0] < 0) {
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pr_debug("failed to open event\n");
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goto out;
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}
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memset(&pe, 0, sizeof(pe));
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pe.size = sizeof(pe);
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pe.type = evsel->attr.type;
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pe.config = evsel->attr.config;
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fd[1] = sys_perf_event_open(&pe, pid, -1, fd[0], flag);
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if (fd[1] < 0) {
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pr_debug("failed to open event\n");
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goto out;
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}
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/*
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* Pick a power-of-two number of pages + 1 for the meta-data
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* page (struct perf_event_mmap_page). See tools/perf/design.txt.
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*/
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mmap_len = page_size * 65;
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event = mmap(NULL, mmap_len, PROT_READ, MAP_SHARED, fd[0], 0);
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if (event == (void *)(-1)) {
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pr_debug("failed to mmap %d\n", errno);
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goto out;
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}
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sleep(1);
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err = TEST_OK;
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munmap(event, mmap_len);
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for (i = 0; i < 2; i++)
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close(fd[i]);
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kill(pid, SIGKILL);
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wait(NULL);
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out:
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perf_evlist__delete(evlist);
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return err;
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}
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