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Date: Sat, 12 Sep 2009 07:55:41 GMT From: tip-bot for Josh Triplett <josh@...htriplett.org> To: linux-tip-commits@...r.kernel.org Cc: linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com, hpa@...or.com, mingo@...hat.com, rostedt@...dmis.org, josh@...htriplett.org, tglx@...utronix.de, mingo@...e.hu Subject: [tip:core/urgent] rcutorture: Occasionally delay readers enough to make RCU force_quiescent_state Commit-ID: f4a82a059aea43947d4f37dba9da1782d11caece Gitweb: http://git.kernel.org/tip/f4a82a059aea43947d4f37dba9da1782d11caece Author: Josh Triplett <josh@...htriplett.org> AuthorDate: Tue, 8 Sep 2009 15:54:35 -0700 Committer: Ingo Molnar <mingo@...e.hu> CommitDate: Sat, 12 Sep 2009 09:47:07 +0200 rcutorture: Occasionally delay readers enough to make RCU force_quiescent_state 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@...htriplett.org> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> Acked-by: Steven Rostedt <rostedt@...dmis.org> Cc: laijs@...fujitsu.com Cc: dipankar@...ibm.com Cc: akpm@...ux-foundation.org Cc: mathieu.desnoyers@...ymtl.ca Cc: josht@...ux.vnet.ibm.com Cc: dvhltc@...ibm.com Cc: niv@...ibm.com Cc: peterz@...radead.org LKML-Reference: <12524504772607-git-send-email-> Signed-off-by: Ingo Molnar <mingo@...e.hu> --- 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) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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