The following commit has been merged into the core/rcu branch of tip: Commit-ID: 96af8669591d740a1e2695c4d96e544409dbf896 Gitweb: https://git.kernel.org/tip/96af8669591d740a1e2695c4d96e544409dbf896 Author: Paul E. McKenney <[email protected]> AuthorDate: Wed, 27 May 2020 16:46:56 -07:00 Committer: Paul E. McKenney <[email protected]> CommitterDate: Mon, 29 Jun 2020 12:00:45 -07:00
refperf: Simplify initialization-time wakeup protocol This commit moves the reader-launch wait loop from ref_perf_init() to main_func(), removing one layer of wakeup and allowing slightly faster system boot. Cc: Joel Fernandes (Google) <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> --- kernel/rcu/refperf.c | 17 +++++------------ 1 file changed, 5 insertions(+), 12 deletions(-) diff --git a/kernel/rcu/refperf.c b/kernel/rcu/refperf.c index 2d2d227..7839237 100644 --- a/kernel/rcu/refperf.c +++ b/kernel/rcu/refperf.c @@ -369,13 +369,14 @@ static int main_func(void *arg) VERBOSE_PERFOUT_ERRSTRING("out of memory"); errexit = true; } - atomic_inc(&n_init); - - // Wait for all threads to start. - wait_event(main_wq, atomic_read(&n_init) == (nreaders + 1)); if (holdoff) schedule_timeout_interruptible(holdoff * HZ); + // Wait for all threads to start. + atomic_inc(&n_init); + while (atomic_read(&n_init) < nreaders + 1) + schedule_timeout_uninterruptible(1); + // Start exp readers up per experiment for (exp = 0; exp < nruns && !torture_must_stop(); exp++) { if (errexit) @@ -565,14 +566,6 @@ ref_perf_init(void) firsterr = torture_create_kthread(main_func, NULL, main_task); if (firsterr) goto unwind; - schedule_timeout_uninterruptible(1); - - - // Wait until all threads start - while (atomic_read(&n_init) < nreaders + 1) - schedule_timeout_uninterruptible(1); - - wake_up(&main_wq); torture_init_end(); return 0;
