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| author | Paul E. McKenney <paulmck@kernel.org> | 2021-04-08 19:46:55 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-05-11 01:05:06 +0200 |
| commit | bcd4af44e2f173074328980b60178fdbb1853e4f (patch) | |
| tree | 709750709efea4dd80b73da5bc6fb35544462d50 /kernel/rcu | |
| parent | rcutorture: Consolidate rcu_torture_boost() timing and statistics (diff) | |
| download | linux-bcd4af44e2f173074328980b60178fdbb1853e4f.tar.xz linux-bcd4af44e2f173074328980b60178fdbb1853e4f.zip | |
rcutorture: Make rcu_torture_boost_failed() check for GP end
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>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/rcutorture.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 31338b2d6609..02a14dfcae67 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -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 |