This source file includes following definitions.
- sigint_handler
- cycles_child
- multi_ebb_procs
- main
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6 #include <stdbool.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <signal.h>
10
11 #include "ebb.h"
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13
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17
18
19 static bool child_should_exit;
20
21 static void sigint_handler(int signal)
22 {
23 child_should_exit = true;
24 }
25
26 struct sigaction sigint_action = {
27 .sa_handler = sigint_handler,
28 };
29
30 static int cycles_child(void)
31 {
32 struct event event;
33
34 if (sigaction(SIGINT, &sigint_action, NULL)) {
35 perror("sigaction");
36 return 1;
37 }
38
39 event_init_named(&event, 0x1001e, "cycles");
40 event_leader_ebb_init(&event);
41
42 event.attr.exclude_kernel = 1;
43 event.attr.exclude_hv = 1;
44 event.attr.exclude_idle = 1;
45
46 FAIL_IF(event_open(&event));
47
48 ebb_enable_pmc_counting(1);
49 setup_ebb_handler(standard_ebb_callee);
50 ebb_global_enable();
51
52 FAIL_IF(ebb_event_enable(&event));
53
54 mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
55
56 while (!child_should_exit) {
57 FAIL_IF(core_busy_loop());
58 FAIL_IF(ebb_check_mmcr0());
59 }
60
61 ebb_global_disable();
62 ebb_freeze_pmcs();
63
64 count_pmc(1, sample_period);
65
66 dump_summary_ebb_state();
67
68 event_close(&event);
69
70 FAIL_IF(ebb_state.stats.ebb_count == 0);
71
72 return 0;
73 }
74
75 #define NR_CHILDREN 4
76
77 int multi_ebb_procs(void)
78 {
79 pid_t pids[NR_CHILDREN];
80 int cpu, rc, i;
81
82 SKIP_IF(!ebb_is_supported());
83
84 cpu = pick_online_cpu();
85 FAIL_IF(cpu < 0);
86 FAIL_IF(bind_to_cpu(cpu));
87
88 for (i = 0; i < NR_CHILDREN; i++) {
89 pids[i] = fork();
90 if (pids[i] == 0)
91 exit(cycles_child());
92 }
93
94
95 sleep(10);
96
97 rc = 0;
98 for (i = 0; i < NR_CHILDREN; i++) {
99
100 kill(pids[i], SIGINT);
101
102 rc |= wait_for_child(pids[i]);
103 }
104
105 return rc;
106 }
107
108 int main(void)
109 {
110 return test_harness(multi_ebb_procs, "multi_ebb_procs");
111 }