Actually wait for the load-helper to complete it switch over to the new load by using a pipe() between the two.
References: https://bugs.freedesktop.org/show_bug.cgi?id=102250 Signed-off-by: Chris Wilson <[email protected]> --- tests/pm_rps.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/tests/pm_rps.c b/tests/pm_rps.c index 202132b1c..8dff5bbc5 100644 --- a/tests/pm_rps.c +++ b/tests/pm_rps.c @@ -181,8 +181,10 @@ enum load { }; static struct load_helper { + int link; enum load load; bool exit; + bool signal; struct igt_helper_process igt_proc; } lh; @@ -190,6 +192,7 @@ static void load_helper_signal_handler(int sig) { if (sig == SIGUSR2) { lh.load = !lh.load; + lh.signal = true; igt_debug("Switching background load to %s\n", lh.load ? "high" : "low"); } else lh.exit = true; @@ -199,6 +202,8 @@ static void load_helper_signal_handler(int sig) #define LOAD_HELPER_BO_SIZE (16*1024*1024) static void load_helper_set_load(enum load load) { + bool dummy; + igt_assert(lh.igt_proc.running); if (lh.load == load) @@ -207,11 +212,14 @@ static void load_helper_set_load(enum load load) lh.load = load; kill(lh.igt_proc.pid, SIGUSR2); - usleep(1000); /* wait for load-helper to switch */ + /* wait for load-helper to switch */ + igt_assert_eq(read(lh.link, &dummy, sizeof(dummy)), sizeof(dummy)); } static void load_helper_run(enum load load) { + int link[2]; + /* * FIXME fork helpers won't get cleaned up when started from within a * subtest, so handle the case where it sticks around a bit too long. @@ -225,6 +233,10 @@ static void load_helper_run(enum load load) lh.exit = false; lh.load = load; + lh.signal = false; + + pipe(link); + lh.link = link[1]; igt_fork_helper(&lh.igt_proc) { igt_spin_t *spin[2] = {}; @@ -249,6 +261,11 @@ static void load_helper_run(enum load load) spin[0] = spin[1]; spin[lh.load == HIGH] = __igt_spin_batch_new(drm_fd); + + if (lh.signal) { + write(lh.link, &lh.signal, sizeof(lh.signal)); + lh.signal = false; + } } handle = spin[0]->handle; @@ -274,6 +291,8 @@ static void load_helper_run(enum load load) igt_spin_batch_free(drm_fd, spin[1]); igt_spin_batch_free(drm_fd, spin[0]); } + + lh.link = link[0]; } static void load_helper_stop(void) -- 2.19.0.rc1 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
