06933e3a73
Adding automated test to check the exact number of breakpoint event overflows and counts. This test was originally done by Vince Weaver for perf_event_tests. Signed-off-by: Jiri Olsa <jolsa@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Link: http://lkml.kernel.org/r/1362940871-24486-7-git-send-email-jolsa@redhat.com [ committer note: s/pr_err/pr_debug/g i.e. print just OK or FAILED in non verbose mode ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
126 lines
2.5 KiB
C
126 lines
2.5 KiB
C
/*
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* Originally done by Vince Weaver <vincent.weaver@maine.edu> for
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* perf_event_tests (git://github.com/deater/perf_event_tests)
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <time.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include <linux/compiler.h>
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#include <linux/hw_breakpoint.h>
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#include "tests.h"
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#include "debug.h"
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#include "perf.h"
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static int overflows;
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__attribute__ ((noinline))
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static int test_function(void)
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{
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return time(NULL);
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}
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static void sig_handler(int signum __maybe_unused,
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siginfo_t *oh __maybe_unused,
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void *uc __maybe_unused)
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{
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overflows++;
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}
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static long long bp_count(int fd)
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{
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long long count;
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int ret;
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ret = read(fd, &count, sizeof(long long));
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if (ret != sizeof(long long)) {
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pr_debug("failed to read: %d\n", ret);
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return TEST_FAIL;
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}
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return count;
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}
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#define EXECUTIONS 10000
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#define THRESHOLD 100
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int test__bp_signal_overflow(void)
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{
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struct perf_event_attr pe;
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struct sigaction sa;
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long long count;
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int fd, i, fails = 0;
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/* setup SIGIO signal handler */
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memset(&sa, 0, sizeof(struct sigaction));
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sa.sa_sigaction = (void *) sig_handler;
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sa.sa_flags = SA_SIGINFO;
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if (sigaction(SIGIO, &sa, NULL) < 0) {
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pr_debug("failed setting up signal handler\n");
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return TEST_FAIL;
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}
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memset(&pe, 0, sizeof(struct perf_event_attr));
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pe.type = PERF_TYPE_BREAKPOINT;
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pe.size = sizeof(struct perf_event_attr);
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pe.config = 0;
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pe.bp_type = HW_BREAKPOINT_X;
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pe.bp_addr = (unsigned long) test_function;
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pe.bp_len = sizeof(long);
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pe.sample_period = THRESHOLD;
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pe.sample_type = PERF_SAMPLE_IP;
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pe.wakeup_events = 1;
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pe.disabled = 1;
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pe.exclude_kernel = 1;
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pe.exclude_hv = 1;
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fd = sys_perf_event_open(&pe, 0, -1, -1, 0);
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if (fd < 0) {
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pr_debug("failed opening event %llx\n", pe.config);
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return TEST_FAIL;
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}
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fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC);
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fcntl(fd, F_SETSIG, SIGIO);
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fcntl(fd, F_SETOWN, getpid());
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ioctl(fd, PERF_EVENT_IOC_RESET, 0);
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ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
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for (i = 0; i < EXECUTIONS; i++)
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test_function();
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ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
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count = bp_count(fd);
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close(fd);
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pr_debug("count %lld, overflow %d\n",
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count, overflows);
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if (count != EXECUTIONS) {
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pr_debug("\tWrong number of executions %lld != %d\n",
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count, EXECUTIONS);
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fails++;
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}
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if (overflows != EXECUTIONS / THRESHOLD) {
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pr_debug("\tWrong number of overflows %d != %d\n",
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overflows, EXECUTIONS / THRESHOLD);
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fails++;
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}
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return fails ? TEST_FAIL : TEST_OK;
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}
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