115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
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/*
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* Copyright 2014, Michael Ellerman, IBM Corp.
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* Licensed under GPLv2.
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*/
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#define _GNU_SOURCE
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#include <elf.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <string.h>
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#include <sys/prctl.h>
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#include "event.h"
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#include "lib.h"
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#include "utils.h"
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/*
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* Test that per-event excludes work.
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*/
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static int per_event_excludes(void)
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{
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struct event *e, events[4];
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char *platform;
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int i;
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platform = (char *)get_auxv_entry(AT_BASE_PLATFORM);
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FAIL_IF(!platform);
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SKIP_IF(strcmp(platform, "power8") != 0);
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/*
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* We need to create the events disabled, otherwise the running/enabled
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* counts don't match up.
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*/
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e = &events[0];
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event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
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PERF_TYPE_HARDWARE, "instructions");
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e->attr.disabled = 1;
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e = &events[1];
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event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
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PERF_TYPE_HARDWARE, "instructions(k)");
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e->attr.disabled = 1;
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e->attr.exclude_user = 1;
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e->attr.exclude_hv = 1;
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e = &events[2];
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event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
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PERF_TYPE_HARDWARE, "instructions(h)");
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e->attr.disabled = 1;
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e->attr.exclude_user = 1;
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e->attr.exclude_kernel = 1;
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e = &events[3];
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event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
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PERF_TYPE_HARDWARE, "instructions(u)");
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e->attr.disabled = 1;
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e->attr.exclude_hv = 1;
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e->attr.exclude_kernel = 1;
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FAIL_IF(event_open(&events[0]));
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/*
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* The open here will fail if we don't have per event exclude support,
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* because the second event has an incompatible set of exclude settings
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* and we're asking for the events to be in a group.
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*/
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for (i = 1; i < 4; i++)
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FAIL_IF(event_open_with_group(&events[i], events[0].fd));
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/*
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* Even though the above will fail without per-event excludes we keep
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* testing in order to be thorough.
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*/
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prctl(PR_TASK_PERF_EVENTS_ENABLE);
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/* Spin for a while */
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for (i = 0; i < INT_MAX; i++)
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asm volatile("" : : : "memory");
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prctl(PR_TASK_PERF_EVENTS_DISABLE);
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for (i = 0; i < 4; i++) {
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FAIL_IF(event_read(&events[i]));
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event_report(&events[i]);
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}
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/*
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* We should see that all events have enabled == running. That
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* shows that they were all on the PMU at once.
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*/
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for (i = 0; i < 4; i++)
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FAIL_IF(events[i].result.running != events[i].result.enabled);
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/*
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* We can also check that the result for instructions is >= all the
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* other counts. That's because it is counting all instructions while
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* the others are counting a subset.
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*/
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for (i = 1; i < 4; i++)
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FAIL_IF(events[0].result.value < events[i].result.value);
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for (i = 0; i < 4; i++)
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event_close(&events[i]);
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return 0;
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}
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int main(void)
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{
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return test_harness(per_event_excludes, "per_event_excludes");
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}
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