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Merge branch 'rcu/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/urgent 

Pull RCU fixes from Paul E. McKenney.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2013-01-24 13:28:24 +01:00
parent ff7532ca2c 1b0048a44c
commit d36b7b9643
2 changed files with 11 additions and 4 deletions
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2
Documentation/kernel-parameters.txt
View File

@ -2438,7 +2438,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
real-time workloads. It can also improve energy
efficiency for asymmetric multiprocessors.
rcu_nocbs_poll [KNL,BOOT]
rcu_nocb_poll [KNL,BOOT]
Rather than requiring that offloaded CPUs
(specified by rcu_nocbs= above) explicitly
awaken the corresponding "rcuoN" kthreads,

13
kernel/rcutree_plugin.h
View File

@ -40,8 +40,7 @@
#ifdef CONFIG_RCU_NOCB_CPU
static cpumask_var_t rcu_nocb_mask; /* CPUs to have callbacks offloaded. */
static bool have_rcu_nocb_mask; /* Was rcu_nocb_mask allocated? */
static bool rcu_nocb_poll; /* Offload kthread are to poll. */
module_param(rcu_nocb_poll, bool, 0444);
static bool __read_mostly rcu_nocb_poll; /* Offload kthread are to poll. */
static char __initdata nocb_buf[NR_CPUS * 5];
#endif /* #ifdef CONFIG_RCU_NOCB_CPU */
@ -2159,6 +2158,13 @@ static int __init rcu_nocb_setup(char *str)
}
__setup("rcu_nocbs=", rcu_nocb_setup);
static int __init parse_rcu_nocb_poll(char *arg)
{
rcu_nocb_poll = 1;
return 0;
}
early_param("rcu_nocb_poll", parse_rcu_nocb_poll);
/* Is the specified CPU a no-CPUs CPU? */
static bool is_nocb_cpu(int cpu)
{
@ -2366,10 +2372,11 @@ static int rcu_nocb_kthread(void *arg)
for (;;) {
/* If not polling, wait for next batch of callbacks. */
if (!rcu_nocb_poll)
wait_event(rdp->nocb_wq, rdp->nocb_head);
wait_event_interruptible(rdp->nocb_wq, rdp->nocb_head);
list = ACCESS_ONCE(rdp->nocb_head);
if (!list) {
schedule_timeout_interruptible(1);
flush_signals(current);
continue;
}