Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 1/3] rcutorture: Occasionally delay readers enough to make RCU force_quiescent_state | Date | Tue, 8 Sep 2009 15:54:35 -0700 |
| |
From: Josh Triplett <josh@joshtriplett.org>
rcutorture already delays readers, but never for long enough to make RCU force a quiescent state. Add an occasional delay of 50ms.
Signed-off-by: Josh Triplett <josh@joshtriplett.org> --- kernel/rcutorture.c | 15 +++++++++------ 1 files changed, 9 insertions(+), 6 deletions(-)
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c index b33db53..328a825 100644 --- a/kernel/rcutorture.c +++ b/kernel/rcutorture.c @@ -281,14 +281,17 @@ static int rcu_torture_read_lock(void) __acquires(RCU) static void rcu_read_delay(struct rcu_random_state *rrsp) { - long delay; - const long longdelay = 200; + const unsigned long shortdelay_us = 200; + const unsigned long longdelay_ms = 50; - /* We want there to be long-running readers, but not all the time. */ + /* 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. */ - delay = rcu_random(rrsp) % (nrealreaders * 2 * longdelay); - if (!delay) - udelay(longdelay); + if (!(rcu_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) + mdelay(longdelay_ms); + if (!(rcu_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) + udelay(shortdelay_us); } static void rcu_torture_read_unlock(int idx) __releases(RCU) -- 1.5.2.5
| |