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rcutorture: Make rcu_torture_boost_failed() check for GP end

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It is possible that a delayed grace period that rcu_torture_boost()
was polling for ended while rcu_torture_boost_failed() was printing the
failure splat.  It would be good to know when this happens.  This commit
therefore has rcu_torture_boost_failed() recheck the grace period after
printing the splat, and printing a message indicating whether or not
the grace period has ended.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-04-08 10:46:55 -07:00
parent 8c7ec02e2a
commit bcd4af44e2
1 changed files with 6 additions and 0 deletions
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6
kernel/rcu/rcutorture.c
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@ -919,6 +919,7 @@ static void rcu_torture_enable_rt_throttle(void)
static bool rcu_torture_boost_failed(unsigned long gp_state, unsigned long start, unsigned long end)
{
static int dbg_done;
bool gp_done;
if (end - start > test_boost_duration * HZ - HZ / 2) {
// Recheck after checking time to avoid false positives.
@ -931,6 +932,11 @@ static bool rcu_torture_boost_failed(unsigned long gp_state, unsigned long start
pr_info("Boost inversion thread ->rt_priority %u gp_state %lu jiffies %lu\n",
current->rt_priority, gp_state, end - start);
cur_ops->gp_kthread_dbg();
// Recheck after print to flag grace period ending during splat.
gp_done = cur_ops->poll_gp_state(gp_state);
pr_info("Boost inversion: GP %lu %s.\n", gp_state,
gp_done ? "ended already" : "still pending");
}
return true; // failed