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perf tests: Add Intel CQM test
Peter reports that it's possible to trigger a WARN_ON_ONCE() in the Intel CQM code by combining a hardware event and an Intel CQM (software) event into a group. Unfortunately, the perf tools are not able to create this bundle and we need to manually construct a test case. For posterity, record Peter's proof of concept test case in tools/perf so that it presents a model for how we can perform architecture specific tests, or "arch tests", in perf in the future. The particular issue triggered in the test case is that when the counter for the hardware event overflows and triggers a PMI we'll read both the hardware event and the software event counters. Unfortunately, for CQM that involves performing an IPI to read the CQM event counters on all sockets, which in NMI context triggers the WARN_ON_ONCE(). Reported-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Matt Fleming <matt.fleming@intel.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Kanaka Juvva <kanaka.d.juvva@intel.com> Cc: Vikas Shivappa <vikas.shivappa@intel.com> Cc: Vince Weaver <vince@deater.net> Link: http://lkml.kernel.org/r/1437490509-15373-1-git-send-email-matt@codeblueprint.co.uk Link: http://lkml.kernel.org/n/tip-3p4ra0u8vzm7m289a1m799kf@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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4 changed files with 130 additions and 0 deletions
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@ -5,6 +5,7 @@
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int test__rdpmc(void);
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int test__perf_time_to_tsc(void);
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int test__insn_x86(void);
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int test__intel_cqm_count_nmi_context(void);
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#ifdef HAVE_DWARF_UNWIND_SUPPORT
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struct thread;
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@ -5,3 +5,4 @@ libperf-y += arch-tests.o
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libperf-y += rdpmc.o
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libperf-y += perf-time-to-tsc.o
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libperf-$(CONFIG_AUXTRACE) += insn-x86.o
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libperf-y += intel-cqm.o
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@ -23,6 +23,10 @@ struct test arch_tests[] = {
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.func = test__insn_x86,
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},
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#endif
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{
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.desc = "Test intel cqm nmi context read",
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.func = test__intel_cqm_count_nmi_context,
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},
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{
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.func = NULL,
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},
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124
tools/perf/arch/x86/tests/intel-cqm.c
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124
tools/perf/arch/x86/tests/intel-cqm.c
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@ -0,0 +1,124 @@
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#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 <sys/mman.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(void)
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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\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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