This commit adds a default-disabled reader_sleep_us module parameter that causes the hazard-pointer reader to unconditionally sleep for the specified number of microseconds.
Signed-off-by: Paul E. McKenney <[email protected]> --- kernel/rcu/hazptrtorture.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/rcu/hazptrtorture.c b/kernel/rcu/hazptrtorture.c index 1a61d35ade1d9d..219fd90a7f8840 100644 --- a/kernel/rcu/hazptrtorture.c +++ b/kernel/rcu/hazptrtorture.c @@ -39,6 +39,7 @@ torture_param(int, onoff_interval, 0, "Time between CPU hotplugs (jiffies), 0=di // @@@ Move the rcu_torture_preempt() function and friends to kernel/torture.c. torture_param(int, preempt_duration, 0, "Preemption duration (ms), zero to disable"); torture_param(int, preempt_interval, MSEC_PER_SEC, "Interval between preemptions (ms)"); +torture_param(int, reader_sleep_us, 0, "Reader sleep duration (us)"); torture_param(int, shuffle_interval, 3, "Number of seconds between shuffles"); torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable."); torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s"); @@ -227,6 +228,8 @@ static void hazptr_read_delay(struct torture_random_state *rrsp) udelay(shortdelay_us); if (!preempt_count() && !(torture_random(rrsp) % (nrealreaders * 500))) torture_preempt_schedule(); /* QS only if preemptible. */ + if (reader_sleep_us > 0) + torture_hrtimeout_us(reader_sleep_us, 0, NULL); } static void hazptr_torture_read_unlock(struct hazptr_ctx *hcp, struct hazptr_torture *htp) @@ -516,11 +519,13 @@ hazptr_torture_print_module_parms(struct hazptr_torture_ops *cur_ops, const char "--- %s: nreaders=%d " "onoff_interval=%d onoff_holdoff=%d " "preempt_duration=%d preempt_interval=%d " + "reader_sleep_us=%d " "shuffle_interval=%d shutdown_secs=%d stat_interval=%d stutter=%d " "verbose=%d\n", torture_type, tag, nrealreaders, onoff_interval, onoff_holdoff, preempt_duration, preempt_interval, + reader_sleep_us, shuffle_interval, shutdown_secs, stat_interval, stutter, verbose); } -- 2.40.1
