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perf test: Add test for counting open syscalls

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To test the use of the perf_evsel class on something other than
the tools from where we refactored code to create it.

It calls open() N times and then checks if the event created to
monitor it returns N events.

[acme@felicio linux]$ perf test
 1: vmlinux symtab matches kallsyms: Ok
 2: detect open syscall event: Ok
[acme@felicio linux]$

It does.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Han Pingtian <phan@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2011-01-04 00:16:20 -02:00
parent 4eed11d5e2
commit d854861c42
1 changed files with 83 additions and 0 deletions
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83
tools/perf/builtin-test.c
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@ -234,6 +234,85 @@ out:
return err;
}
#include "util/evsel.h"
#include <sys/types.h>
static int trace_event__id(const char *event_name)
{
char *filename;
int err = -1, fd;
if (asprintf(&filename,
"/sys/kernel/debug/tracing/events/syscalls/%s/id",
event_name) < 0)
return -1;
fd = open(filename, O_RDONLY);
if (fd >= 0) {
char id[16];
if (read(fd, id, sizeof(id)) > 0)
err = atoi(id);
close(fd);
}
free(filename);
return err;
}
static int test__open_syscall_event(void)
{
int err = -1, fd;
struct thread_map *threads;
struct perf_evsel *evsel;
unsigned int nr_open_calls = 111, i;
int id = trace_event__id("sys_enter_open");
if (id < 0) {
pr_debug("trace_event__id(\"sys_enter_open\") ");
return -1;
}
threads = thread_map__new(-1, getpid());
if (threads == NULL) {
pr_debug("thread_map__new ");
return -1;
}
evsel = perf_evsel__new(PERF_TYPE_TRACEPOINT, id, 0);
if (evsel == NULL) {
pr_debug("perf_evsel__new ");
goto out_thread_map_delete;
}
if (perf_evsel__open_per_thread(evsel, threads) < 0) {
pr_debug("perf_evsel__open_per_thread ");
goto out_evsel_delete;
}
for (i = 0; i < nr_open_calls; ++i) {
fd = open("/etc/passwd", O_RDONLY);
close(fd);
}
if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
pr_debug("perf_evsel__open_read_on_cpu ");
goto out_close_fd;
}
if (evsel->counts->cpu[0].val != nr_open_calls)
pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %Ld ",
nr_open_calls, evsel->counts->cpu[0].val);
err = 0;
out_close_fd:
perf_evsel__close_fd(evsel, 1, threads->nr);
out_evsel_delete:
perf_evsel__delete(evsel);
out_thread_map_delete:
thread_map__delete(threads);
return err;
}
static struct test {
const char *desc;
int (*func)(void);
@ -242,6 +321,10 @@ static struct test {
.desc = "vmlinux symtab matches kallsyms",
.func = test__vmlinux_matches_kallsyms,
},
{
.desc = "detect open syscall event",
.func = test__open_syscall_event,
},
{
.func = NULL,
},