582 lines
13 KiB
C
582 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <sys/time.h>
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#include <sys/prctl.h>
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#include <errno.h>
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#include <time.h>
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#include <stdlib.h>
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#include <linux/zalloc.h>
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#include "parse-events.h"
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#include "evlist.h"
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#include "evsel.h"
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#include "thread_map.h"
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#include "cpumap.h"
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#include "tests.h"
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static int spin_sleep(void)
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{
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struct timeval start, now, diff, maxtime;
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struct timespec ts;
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int err, i;
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maxtime.tv_sec = 0;
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maxtime.tv_usec = 50000;
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err = gettimeofday(&start, NULL);
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if (err)
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return err;
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/* Spin for 50ms */
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while (1) {
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for (i = 0; i < 1000; i++)
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barrier();
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err = gettimeofday(&now, NULL);
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if (err)
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return err;
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timersub(&now, &start, &diff);
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if (timercmp(&diff, &maxtime, > /* For checkpatch */))
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break;
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}
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ts.tv_nsec = 50 * 1000 * 1000;
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ts.tv_sec = 0;
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/* Sleep for 50ms */
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err = nanosleep(&ts, NULL);
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if (err == EINTR)
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err = 0;
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return err;
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}
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struct switch_tracking {
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struct perf_evsel *switch_evsel;
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struct perf_evsel *cycles_evsel;
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pid_t *tids;
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int nr_tids;
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int comm_seen[4];
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int cycles_before_comm_1;
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int cycles_between_comm_2_and_comm_3;
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int cycles_after_comm_4;
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};
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static int check_comm(struct switch_tracking *switch_tracking,
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union perf_event *event, const char *comm, int nr)
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{
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if (event->header.type == PERF_RECORD_COMM &&
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(pid_t)event->comm.pid == getpid() &&
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(pid_t)event->comm.tid == getpid() &&
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strcmp(event->comm.comm, comm) == 0) {
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if (switch_tracking->comm_seen[nr]) {
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pr_debug("Duplicate comm event\n");
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return -1;
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}
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switch_tracking->comm_seen[nr] = 1;
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pr_debug3("comm event: %s nr: %d\n", event->comm.comm, nr);
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return 1;
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}
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return 0;
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}
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static int check_cpu(struct switch_tracking *switch_tracking, int cpu)
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{
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int i, nr = cpu + 1;
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if (cpu < 0)
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return -1;
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if (!switch_tracking->tids) {
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switch_tracking->tids = calloc(nr, sizeof(pid_t));
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if (!switch_tracking->tids)
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return -1;
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for (i = 0; i < nr; i++)
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switch_tracking->tids[i] = -1;
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switch_tracking->nr_tids = nr;
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return 0;
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}
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if (cpu >= switch_tracking->nr_tids) {
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void *addr;
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addr = realloc(switch_tracking->tids, nr * sizeof(pid_t));
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if (!addr)
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return -1;
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switch_tracking->tids = addr;
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for (i = switch_tracking->nr_tids; i < nr; i++)
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switch_tracking->tids[i] = -1;
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switch_tracking->nr_tids = nr;
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return 0;
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}
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return 0;
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}
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static int process_sample_event(struct perf_evlist *evlist,
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union perf_event *event,
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struct switch_tracking *switch_tracking)
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{
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struct perf_sample sample;
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struct perf_evsel *evsel;
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pid_t next_tid, prev_tid;
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int cpu, err;
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if (perf_evlist__parse_sample(evlist, event, &sample)) {
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pr_debug("perf_evlist__parse_sample failed\n");
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return -1;
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}
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evsel = perf_evlist__id2evsel(evlist, sample.id);
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if (evsel == switch_tracking->switch_evsel) {
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next_tid = perf_evsel__intval(evsel, &sample, "next_pid");
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prev_tid = perf_evsel__intval(evsel, &sample, "prev_pid");
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cpu = sample.cpu;
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pr_debug3("sched_switch: cpu: %d prev_tid %d next_tid %d\n",
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cpu, prev_tid, next_tid);
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err = check_cpu(switch_tracking, cpu);
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if (err)
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return err;
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/*
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* Check for no missing sched_switch events i.e. that the
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* evsel->system_wide flag has worked.
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*/
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if (switch_tracking->tids[cpu] != -1 &&
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switch_tracking->tids[cpu] != prev_tid) {
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pr_debug("Missing sched_switch events\n");
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return -1;
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}
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switch_tracking->tids[cpu] = next_tid;
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}
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if (evsel == switch_tracking->cycles_evsel) {
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pr_debug3("cycles event\n");
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if (!switch_tracking->comm_seen[0])
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switch_tracking->cycles_before_comm_1 = 1;
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if (switch_tracking->comm_seen[1] &&
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!switch_tracking->comm_seen[2])
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switch_tracking->cycles_between_comm_2_and_comm_3 = 1;
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if (switch_tracking->comm_seen[3])
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switch_tracking->cycles_after_comm_4 = 1;
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}
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return 0;
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}
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static int process_event(struct perf_evlist *evlist, union perf_event *event,
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struct switch_tracking *switch_tracking)
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{
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if (event->header.type == PERF_RECORD_SAMPLE)
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return process_sample_event(evlist, event, switch_tracking);
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if (event->header.type == PERF_RECORD_COMM) {
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int err, done = 0;
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err = check_comm(switch_tracking, event, "Test COMM 1", 0);
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if (err < 0)
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return -1;
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done += err;
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err = check_comm(switch_tracking, event, "Test COMM 2", 1);
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if (err < 0)
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return -1;
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done += err;
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err = check_comm(switch_tracking, event, "Test COMM 3", 2);
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if (err < 0)
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return -1;
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done += err;
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err = check_comm(switch_tracking, event, "Test COMM 4", 3);
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if (err < 0)
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return -1;
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done += err;
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if (done != 1) {
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pr_debug("Unexpected comm event\n");
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return -1;
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}
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}
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return 0;
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}
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struct event_node {
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struct list_head list;
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union perf_event *event;
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u64 event_time;
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};
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static int add_event(struct perf_evlist *evlist, struct list_head *events,
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union perf_event *event)
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{
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struct perf_sample sample;
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struct event_node *node;
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node = malloc(sizeof(struct event_node));
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if (!node) {
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pr_debug("malloc failed\n");
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return -1;
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}
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node->event = event;
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list_add(&node->list, events);
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if (perf_evlist__parse_sample(evlist, event, &sample)) {
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pr_debug("perf_evlist__parse_sample failed\n");
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return -1;
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}
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if (!sample.time) {
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pr_debug("event with no time\n");
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return -1;
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}
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node->event_time = sample.time;
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return 0;
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}
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static void free_event_nodes(struct list_head *events)
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{
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struct event_node *node;
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while (!list_empty(events)) {
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node = list_entry(events->next, struct event_node, list);
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list_del_init(&node->list);
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free(node);
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}
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}
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static int compar(const void *a, const void *b)
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{
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const struct event_node *nodea = a;
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const struct event_node *nodeb = b;
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s64 cmp = nodea->event_time - nodeb->event_time;
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return cmp;
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}
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static int process_events(struct perf_evlist *evlist,
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struct switch_tracking *switch_tracking)
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{
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union perf_event *event;
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unsigned pos, cnt = 0;
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LIST_HEAD(events);
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struct event_node *events_array, *node;
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struct perf_mmap *md;
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int i, ret;
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for (i = 0; i < evlist->nr_mmaps; i++) {
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md = &evlist->mmap[i];
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if (perf_mmap__read_init(md) < 0)
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continue;
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while ((event = perf_mmap__read_event(md)) != NULL) {
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cnt += 1;
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ret = add_event(evlist, &events, event);
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perf_mmap__consume(md);
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if (ret < 0)
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goto out_free_nodes;
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}
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perf_mmap__read_done(md);
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}
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events_array = calloc(cnt, sizeof(struct event_node));
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if (!events_array) {
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pr_debug("calloc failed\n");
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ret = -1;
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goto out_free_nodes;
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}
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pos = 0;
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list_for_each_entry(node, &events, list)
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events_array[pos++] = *node;
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qsort(events_array, cnt, sizeof(struct event_node), compar);
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for (pos = 0; pos < cnt; pos++) {
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ret = process_event(evlist, events_array[pos].event,
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switch_tracking);
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if (ret < 0)
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goto out_free;
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}
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ret = 0;
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out_free:
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pr_debug("%u events recorded\n", cnt);
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free(events_array);
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out_free_nodes:
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free_event_nodes(&events);
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return ret;
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}
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/**
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* test__switch_tracking - test using sched_switch and tracking events.
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*
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* This function implements a test that checks that sched_switch events and
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* tracking events can be recorded for a workload (current process) using the
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* evsel->system_wide and evsel->tracking flags (respectively) with other events
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* sometimes enabled or disabled.
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*/
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int test__switch_tracking(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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const char *sched_switch = "sched:sched_switch";
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struct switch_tracking switch_tracking = { .tids = NULL, };
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struct record_opts opts = {
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.mmap_pages = UINT_MAX,
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.user_freq = UINT_MAX,
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.user_interval = ULLONG_MAX,
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.freq = 4000,
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.target = {
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.uses_mmap = true,
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},
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};
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struct thread_map *threads = NULL;
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struct cpu_map *cpus = NULL;
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struct perf_evlist *evlist = NULL;
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struct perf_evsel *evsel, *cpu_clocks_evsel, *cycles_evsel;
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struct perf_evsel *switch_evsel, *tracking_evsel;
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const char *comm;
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int err = -1;
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threads = thread_map__new(-1, getpid(), UINT_MAX);
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if (!threads) {
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pr_debug("thread_map__new failed!\n");
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goto out_err;
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}
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cpus = cpu_map__new(NULL);
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if (!cpus) {
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pr_debug("cpu_map__new failed!\n");
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goto out_err;
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}
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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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goto out_err;
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}
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perf_evlist__set_maps(evlist, cpus, threads);
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/* First event */
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err = parse_events(evlist, "cpu-clock:u", NULL);
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if (err) {
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pr_debug("Failed to parse event dummy:u\n");
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goto out_err;
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}
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cpu_clocks_evsel = perf_evlist__last(evlist);
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/* Second event */
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err = parse_events(evlist, "cycles:u", NULL);
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if (err) {
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pr_debug("Failed to parse event cycles:u\n");
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goto out_err;
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}
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cycles_evsel = perf_evlist__last(evlist);
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/* Third event */
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if (!perf_evlist__can_select_event(evlist, sched_switch)) {
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pr_debug("No sched_switch\n");
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err = 0;
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goto out;
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}
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err = parse_events(evlist, sched_switch, NULL);
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if (err) {
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pr_debug("Failed to parse event %s\n", sched_switch);
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goto out_err;
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}
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switch_evsel = perf_evlist__last(evlist);
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perf_evsel__set_sample_bit(switch_evsel, CPU);
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perf_evsel__set_sample_bit(switch_evsel, TIME);
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switch_evsel->system_wide = true;
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switch_evsel->no_aux_samples = true;
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switch_evsel->immediate = true;
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/* Test moving an event to the front */
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if (cycles_evsel == perf_evlist__first(evlist)) {
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pr_debug("cycles event already at front");
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goto out_err;
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}
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perf_evlist__to_front(evlist, cycles_evsel);
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if (cycles_evsel != perf_evlist__first(evlist)) {
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pr_debug("Failed to move cycles event to front");
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goto out_err;
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}
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perf_evsel__set_sample_bit(cycles_evsel, CPU);
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perf_evsel__set_sample_bit(cycles_evsel, TIME);
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/* Fourth event */
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err = parse_events(evlist, "dummy:u", NULL);
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if (err) {
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pr_debug("Failed to parse event dummy:u\n");
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goto out_err;
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}
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tracking_evsel = perf_evlist__last(evlist);
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perf_evlist__set_tracking_event(evlist, tracking_evsel);
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tracking_evsel->attr.freq = 0;
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tracking_evsel->attr.sample_period = 1;
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perf_evsel__set_sample_bit(tracking_evsel, TIME);
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/* Config events */
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perf_evlist__config(evlist, &opts, NULL);
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/* Check moved event is still at the front */
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if (cycles_evsel != perf_evlist__first(evlist)) {
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pr_debug("Front event no longer at front");
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goto out_err;
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}
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/* Check tracking event is tracking */
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if (!tracking_evsel->attr.mmap || !tracking_evsel->attr.comm) {
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pr_debug("Tracking event not tracking\n");
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goto out_err;
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}
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|
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/* Check non-tracking events are not tracking */
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evlist__for_each_entry(evlist, evsel) {
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if (evsel != tracking_evsel) {
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if (evsel->attr.mmap || evsel->attr.comm) {
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pr_debug("Non-tracking event is tracking\n");
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goto out_err;
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}
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}
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}
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|
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if (perf_evlist__open(evlist) < 0) {
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pr_debug("Not supported\n");
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err = 0;
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goto out;
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}
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|
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err = perf_evlist__mmap(evlist, UINT_MAX);
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if (err) {
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pr_debug("perf_evlist__mmap failed!\n");
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goto out_err;
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}
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|
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perf_evlist__enable(evlist);
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|
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err = perf_evsel__disable(cpu_clocks_evsel);
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if (err) {
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pr_debug("perf_evlist__disable_event failed!\n");
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goto out_err;
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}
|
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|
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err = spin_sleep();
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if (err) {
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pr_debug("spin_sleep failed!\n");
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goto out_err;
|
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}
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|
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comm = "Test COMM 1";
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err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
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if (err) {
|
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pr_debug("PR_SET_NAME failed!\n");
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goto out_err;
|
|
}
|
|
|
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err = perf_evsel__disable(cycles_evsel);
|
|
if (err) {
|
|
pr_debug("perf_evlist__disable_event failed!\n");
|
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goto out_err;
|
|
}
|
|
|
|
comm = "Test COMM 2";
|
|
err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
|
|
if (err) {
|
|
pr_debug("PR_SET_NAME failed!\n");
|
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goto out_err;
|
|
}
|
|
|
|
err = spin_sleep();
|
|
if (err) {
|
|
pr_debug("spin_sleep failed!\n");
|
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goto out_err;
|
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}
|
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|
|
comm = "Test COMM 3";
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err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
|
|
if (err) {
|
|
pr_debug("PR_SET_NAME failed!\n");
|
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goto out_err;
|
|
}
|
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|
|
err = perf_evsel__enable(cycles_evsel);
|
|
if (err) {
|
|
pr_debug("perf_evlist__disable_event failed!\n");
|
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goto out_err;
|
|
}
|
|
|
|
comm = "Test COMM 4";
|
|
err = prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0);
|
|
if (err) {
|
|
pr_debug("PR_SET_NAME failed!\n");
|
|
goto out_err;
|
|
}
|
|
|
|
err = spin_sleep();
|
|
if (err) {
|
|
pr_debug("spin_sleep failed!\n");
|
|
goto out_err;
|
|
}
|
|
|
|
perf_evlist__disable(evlist);
|
|
|
|
switch_tracking.switch_evsel = switch_evsel;
|
|
switch_tracking.cycles_evsel = cycles_evsel;
|
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|
|
err = process_events(evlist, &switch_tracking);
|
|
|
|
zfree(&switch_tracking.tids);
|
|
|
|
if (err)
|
|
goto out_err;
|
|
|
|
/* Check all 4 comm events were seen i.e. that evsel->tracking works */
|
|
if (!switch_tracking.comm_seen[0] || !switch_tracking.comm_seen[1] ||
|
|
!switch_tracking.comm_seen[2] || !switch_tracking.comm_seen[3]) {
|
|
pr_debug("Missing comm events\n");
|
|
goto out_err;
|
|
}
|
|
|
|
/* Check cycles event got enabled */
|
|
if (!switch_tracking.cycles_before_comm_1) {
|
|
pr_debug("Missing cycles events\n");
|
|
goto out_err;
|
|
}
|
|
|
|
/* Check cycles event got disabled */
|
|
if (switch_tracking.cycles_between_comm_2_and_comm_3) {
|
|
pr_debug("cycles events even though event was disabled\n");
|
|
goto out_err;
|
|
}
|
|
|
|
/* Check cycles event got enabled again */
|
|
if (!switch_tracking.cycles_after_comm_4) {
|
|
pr_debug("Missing cycles events\n");
|
|
goto out_err;
|
|
}
|
|
out:
|
|
if (evlist) {
|
|
perf_evlist__disable(evlist);
|
|
perf_evlist__delete(evlist);
|
|
} else {
|
|
cpu_map__put(cpus);
|
|
thread_map__put(threads);
|
|
}
|
|
|
|
return err;
|
|
|
|
out_err:
|
|
err = -1;
|
|
goto out;
|
|
}
|