1 // SPDX-License-Identifier: GPL-2.0
4 /* For the CPU_* macros */
10 #include <api/fs/fs.h>
11 #include <linux/err.h>
12 #include <api/fs/tracing_path.h>
15 #include "thread_map.h"
20 int test__openat_syscall_event_on_all_cpus(struct test
*test __maybe_unused
, int subtest __maybe_unused
)
22 int err
= -1, fd
, cpu
;
24 struct perf_evsel
*evsel
;
25 unsigned int nr_openat_calls
= 111, i
;
27 struct thread_map
*threads
= thread_map__new(-1, getpid(), UINT_MAX
);
28 char sbuf
[STRERR_BUFSIZE
];
31 if (threads
== NULL
) {
32 pr_debug("thread_map__new\n");
36 cpus
= cpu_map__new(NULL
);
38 pr_debug("cpu_map__new\n");
39 goto out_thread_map_delete
;
44 evsel
= perf_evsel__newtp("syscalls", "sys_enter_openat");
46 tracing_path__strerror_open_tp(errno
, errbuf
, sizeof(errbuf
), "syscalls", "sys_enter_openat");
47 pr_debug("%s\n", errbuf
);
48 goto out_cpu_map_delete
;
51 if (perf_evsel__open(evsel
, cpus
, threads
) < 0) {
52 pr_debug("failed to open counter: %s, "
53 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
54 str_error_r(errno
, sbuf
, sizeof(sbuf
)));
55 goto out_evsel_delete
;
58 for (cpu
= 0; cpu
< cpus
->nr
; ++cpu
) {
59 unsigned int ncalls
= nr_openat_calls
+ cpu
;
61 * XXX eventually lift this restriction in a way that
62 * keeps perf building on older glibc installations
63 * without CPU_ALLOC. 1024 cpus in 2010 still seems
64 * a reasonable upper limit tho :-)
66 if (cpus
->map
[cpu
] >= CPU_SETSIZE
) {
67 pr_debug("Ignoring CPU %d\n", cpus
->map
[cpu
]);
71 CPU_SET(cpus
->map
[cpu
], &cpu_set
);
72 if (sched_setaffinity(0, sizeof(cpu_set
), &cpu_set
) < 0) {
73 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
75 str_error_r(errno
, sbuf
, sizeof(sbuf
)));
78 for (i
= 0; i
< ncalls
; ++i
) {
79 fd
= openat(0, "/etc/passwd", O_RDONLY
);
82 CPU_CLR(cpus
->map
[cpu
], &cpu_set
);
86 * Here we need to explicitly preallocate the counts, as if
87 * we use the auto allocation it will allocate just for 1 cpu,
88 * as we start by cpu 0.
90 if (perf_evsel__alloc_counts(evsel
, cpus
->nr
, 1) < 0) {
91 pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus
->nr
);
97 for (cpu
= 0; cpu
< cpus
->nr
; ++cpu
) {
98 unsigned int expected
;
100 if (cpus
->map
[cpu
] >= CPU_SETSIZE
)
103 if (perf_evsel__read_on_cpu(evsel
, cpu
, 0) < 0) {
104 pr_debug("perf_evsel__read_on_cpu\n");
109 expected
= nr_openat_calls
+ cpu
;
110 if (perf_counts(evsel
->counts
, cpu
, 0)->val
!= expected
) {
111 pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64
"\n",
112 expected
, cpus
->map
[cpu
], perf_counts(evsel
->counts
, cpu
, 0)->val
);
117 perf_evsel__free_counts(evsel
);
119 perf_evsel__close_fd(evsel
);
121 perf_evsel__delete(evsel
);
124 out_thread_map_delete
:
125 thread_map__put(threads
);