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perf test: Add a signal handler around running a test

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Add a signal handler around running a test. If a signal occurs during
the test a siglongjmp unwinds the stack and output is flushed. The
global run_test_jmp_buf is either unique per forked child or not
shared during sequential execution.

Tested-by: James Clark <james.clark@linaro.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Colin Ian King <colin.i.king@gmail.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Weilin Wang <weilin.wang@intel.com>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Veronika Molnarova <vmolnaro@redhat.com>
Link: https://lore.kernel.org/r/20241025192109.132482-7-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Ian Rogers
2024-10-25 12:21:05 -07:00
committed by Namhyung Kim
parent 2532be3d21
commit a6fffc6094
1 changed files with 27 additions and 1 deletions
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tools/perf/tests/builtin-test.c
+27 -1
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@@ -8,6 +8,7 @@
#include <errno.h>
#include <poll.h>
#include <unistd.h>
#include <setjmp.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
@@ -229,16 +230,41 @@ struct child_test {
int subtest;
};
static jmp_buf run_test_jmp_buf;
static void child_test_sig_handler(int sig)
{
siglongjmp(run_test_jmp_buf, sig);
}
static int run_test_child(struct child_process *process)
{
struct child_test *child = container_of(process, struct child_test, process);
const int signals[] = {
SIGABRT, SIGBUS, SIGFPE, SIGILL, SIGINT, SIGPIPE, SIGQUIT, SIGSEGV, SIGTERM,
};
static struct child_test *child;
int err;
err = sigsetjmp(run_test_jmp_buf, 1);
if (err) {
fprintf(stderr, "\n---- unexpected signal (%d) ----\n", err);
err = err > 0 ? -err : -1;
goto err_out;
}
child = container_of(process, struct child_test, process);
for (size_t i = 0; i < ARRAY_SIZE(signals); i++)
signal(signals[i], child_test_sig_handler);
pr_debug("--- start ---\n");
pr_debug("test child forked, pid %d\n", getpid());
err = test_function(child->test, child->subtest)(child->test, child->subtest);
pr_debug("---- end(%d) ----\n", err);
err_out:
fflush(NULL);
for (size_t i = 0; i < ARRAY_SIZE(signals); i++)
signal(signals[i], SIG_DFL);
return -err;
}