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rcu: Add a module parameter to force use of expedited RCU primitives

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There have been some embedded applications that would benefit from
use of expedited grace-period primitives.  In some ways, this is
similar to synchronize_net() doing either a normal or an expedited
grace period depending on lock state, but with control outside of
the kernel.

This commit therefore adds rcu_expedited boot and sysfs parameters
that cause the kernel to substitute expedited primitives for the
normal grace-period primitives.

[ paulmck: Add trace/event/rcu.h to kernel/srcu.c to avoid build error.
	   Get rid of infinite loop through contention path.]

Signed-off-by: Antti P Miettinen <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
This commit is contained in:
Antti P Miettinen 2012-10-05 09:59:15 +03:00 • committed by Paul E. McKenney
commit 3705b88db0
7 changed files with 48 additions and 7 deletions
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12
kernel/rcutree.c
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@ -2224,7 +2224,10 @@ void synchronize_sched(void)
"Illegal synchronize_sched() in RCU-sched read-side critical section");
if (rcu_blocking_is_gp())
return;
wait_rcu_gp(call_rcu_sched);
if (rcu_expedited)
synchronize_sched_expedited();
else
wait_rcu_gp(call_rcu_sched);
}
EXPORT_SYMBOL_GPL(synchronize_sched);
@ -2245,7 +2248,10 @@ void synchronize_rcu_bh(void)
"Illegal synchronize_rcu_bh() in RCU-bh read-side critical section");
if (rcu_blocking_is_gp())
return;
wait_rcu_gp(call_rcu_bh);
if (rcu_expedited)
synchronize_rcu_bh_expedited();
else
wait_rcu_gp(call_rcu_bh);
}
EXPORT_SYMBOL_GPL(synchronize_rcu_bh);
@ -2328,7 +2334,7 @@ void synchronize_sched_expedited(void)
if (trycount++ < 10) {
udelay(trycount * num_online_cpus());
} else {
synchronize_sched();
wait_rcu_gp(call_rcu_sched);
return;
}