When some of CPUs are offline:
# cat /sys/devices/system/cpu/online
0,6-31
perf test will fail on #3 testcase:
3: detect open syscall event on all cpus:
--- start ---
perf_evsel__read_on_cpu: expected to intercept 111 calls on cpu 0, got 681
perf_evsel__read_on_cpu: expected to intercept 112 calls on cpu 1, got 117
perf_evsel__read_on_cpu: expected to intercept 113 calls on cpu 2, got 118
perf_evsel__read_on_cpu: expected to intercept 114 calls on cpu 3, got 119
perf_evsel__read_on_cpu: expected to intercept 115 calls on cpu 4, got 120
perf_evsel__read_on_cpu: expected to intercept 116 calls on cpu 5, got 121
perf_evsel__read_on_cpu: expected to intercept 117 calls on cpu 6, got 122
perf_evsel__read_on_cpu: expected to intercept 118 calls on cpu 7, got 123
perf_evsel__read_on_cpu: expected to intercept 119 calls on cpu 8, got 124
perf_evsel__read_on_cpu: expected to intercept 120 calls on cpu 9, got 125
perf_evsel__read_on_cpu: expected to intercept 121 calls on cpu 10, got 126
....
This patch try to use 'cpus->map[cpu]' when setting cpu affinity, and
will check the return code of sched_setaffinity()
LKML-Reference: <
20110120114707.GA11781@hpt.nay.redhat.com>
Signed-off-by: Han Pingtian <phan@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
for (cpu = 0; cpu < cpus->nr; ++cpu) {
unsigned int ncalls = nr_open_calls + cpu;
- CPU_SET(cpu, cpu_set);
- sched_setaffinity(0, cpu_set_size, cpu_set);
+ CPU_SET_S(cpus->map[cpu], cpu_set_size, cpu_set);
+ if (sched_setaffinity(0, cpu_set_size, cpu_set) < 0) {
+ pr_debug("sched_setaffinity() failed on CPU %d: %s ",
+ cpus->map[cpu],
+ strerror(errno));
+ goto out_close_fd;
+ }
for (i = 0; i < ncalls; ++i) {
fd = open("/etc/passwd", O_RDONLY);
close(fd);
}
- CPU_CLR(cpu, cpu_set);
+ CPU_CLR_S(cpus->map[cpu], cpu_set_size, cpu_set);
}
/*
expected = nr_open_calls + cpu;
if (evsel->counts->cpu[cpu].val != expected) {
pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %Ld\n",
- expected, cpu, evsel->counts->cpu[cpu].val);
+ expected, cpus->map[cpu], evsel->counts->cpu[cpu].val);
goto out_close_fd;
}
}