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| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-10-10 18:26:04 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-11-14 10:46:30 -0800 |
| commit | d0af39e89ec59fe7c92c4bcbc2d652ea4c0ee644 (patch) | |
| tree | d254d9f921fd2f4f4f7c537ff9b9a4858d2ab596 /kernel/rcu | |
| parent | rcu: RCU_TRACE enables event tracing as well as debugfs (diff) | |
| download | linux-dev-d0af39e89ec59fe7c92c4bcbc2d652ea4c0ee644.tar.xz linux-dev-d0af39e89ec59fe7c92c4bcbc2d652ea4c0ee644.zip | |
torture: Trace long read-side delays
Although rcutorture will occasionally do a 50-millisecond grace-period
delay, these delays are quite rare. And rightly so, because otherwise
the read rate would be quite low. Thie means that it can be important
to identify whether or not a given run contained a long-delay read.
This commit therefore inserts a trace_rcu_torture_read() event to flag
runs containing long delays.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/rcutorture.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index bf08fee53dc7..87c51225ceec 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -289,15 +289,24 @@ static int rcu_torture_read_lock(void) __acquires(RCU) static void rcu_read_delay(struct torture_random_state *rrsp) { + unsigned long started; + unsigned long completed; const unsigned long shortdelay_us = 200; const unsigned long longdelay_ms = 50; + unsigned long long ts; /* We want a short delay sometimes to make a reader delay the grace * period, and we want a long delay occasionally to trigger * force_quiescent_state. */ - if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) + if (!(torture_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) { + started = cur_ops->completed(); + ts = rcu_trace_clock_local(); mdelay(longdelay_ms); + completed = cur_ops->completed(); + do_trace_rcu_torture_read(cur_ops->name, NULL, ts, + started, completed); + } if (!(torture_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) udelay(shortdelay_us); #ifdef CONFIG_PREEMPT |