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selftests/timers/posix-timers: Add a test for exact allocation mode

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The exact timer ID allocation mode is used by CRIU to restore timers with a
given ID. Add a test case for it.

It's skipped on older kernels when the prctl() fails.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/all/8734fl2tkx.ffs@tglx
This commit is contained in:
Thomas Gleixner 2025-03-10 09:11:42 +01:00
parent ec2d0c0462
commit 8e63360d86
1 changed files with 72 additions and 1 deletions
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73
tools/testing/selftests/timers/posix_timers.c
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@ -7,6 +7,7 @@
* Kernel loop code stolen from Steven Rostedt <srostedt@redhat.com>
*/
#define _GNU_SOURCE
#include <sys/prctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <stdio.h>
@ -599,14 +600,84 @@ static void check_overrun(int which, const char *name)
"check_overrun %s\n", name);
}
#include <sys/syscall.h>
static int do_timer_create(int *id)
{
return syscall(__NR_timer_create, CLOCK_MONOTONIC, NULL, id);
}
static int do_timer_delete(int id)
{
return syscall(__NR_timer_delete, id);
}
#ifndef PR_TIMER_CREATE_RESTORE_IDS
# define PR_TIMER_CREATE_RESTORE_IDS 77
# define PR_TIMER_CREATE_RESTORE_IDS_OFF 0
# define PR_TIMER_CREATE_RESTORE_IDS_ON 1
# define PR_TIMER_CREATE_RESTORE_IDS_GET 2
#endif
static void check_timer_create_exact(void)
{
int id;
if (prctl(PR_TIMER_CREATE_RESTORE_IDS, PR_TIMER_CREATE_RESTORE_IDS_ON, 0, 0, 0)) {
switch (errno) {
case EINVAL:
ksft_test_result_skip("check timer create exact, not supported\n");
return;
default:
ksft_test_result_skip("check timer create exact, errno = %d\n", errno);
return;
}
}
if (prctl(PR_TIMER_CREATE_RESTORE_IDS, PR_TIMER_CREATE_RESTORE_IDS_GET, 0, 0, 0) != 1)
fatal_error(NULL, "prctl(GET) failed\n");
id = 8;
if (do_timer_create(&id) < 0)
fatal_error(NULL, "timer_create()");
if (do_timer_delete(id))
fatal_error(NULL, "timer_delete()");
if (prctl(PR_TIMER_CREATE_RESTORE_IDS, PR_TIMER_CREATE_RESTORE_IDS_OFF, 0, 0, 0))
fatal_error(NULL, "prctl(OFF)");
if (prctl(PR_TIMER_CREATE_RESTORE_IDS, PR_TIMER_CREATE_RESTORE_IDS_GET, 0, 0, 0) != 0)
fatal_error(NULL, "prctl(GET) failed\n");
if (id != 8) {
ksft_test_result_fail("check timer create exact %d != 8\n", id);
return;
}
/* Validate that it went back to normal mode and allocates ID 9 */
if (do_timer_create(&id) < 0)
fatal_error(NULL, "timer_create()");
if (do_timer_delete(id))
fatal_error(NULL, "timer_delete()");
if (id == 9)
ksft_test_result_pass("check timer create exact\n");
else
ksft_test_result_fail("check timer create exact. Disabling failed.\n");
}
int main(int argc, char **argv)
{
ksft_print_header();
ksft_set_plan(18);
ksft_set_plan(19);
ksft_print_msg("Testing posix timers. False negative may happen on CPU execution \n");
ksft_print_msg("based timers if other threads run on the CPU...\n");
check_timer_create_exact();
check_itimer(ITIMER_VIRTUAL, "ITIMER_VIRTUAL");
check_itimer(ITIMER_PROF, "ITIMER_PROF");
check_itimer(ITIMER_REAL, "ITIMER_REAL");