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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-06-21 17:10:40 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-08-31 14:44:02 -0700 |
| commit | eb75767be0e514f97bf1b5cec763696cfc7f7e2a (patch) | |
| tree | 08cae2878e46409d6f5cffd0d37499bfa4851abc /kernel/rcutree.c | |
| parent | 0edd1b1784cbdad55aca2c1293be018f53c0ab1d (diff) | |
| download | linux-eb75767be0e514f97bf1b5cec763696cfc7f7e2a.tar.bz2 | |
nohz_full: Force RCU's grace-period kthreads onto timekeeping CPU
Because RCU's quiescent-state-forcing mechanism is used to drive the
full-system-idle state machine, and because this mechanism is executed
by RCU's grace-period kthreads, this commit forces these kthreads to
run on the timekeeping CPU (tick_do_timer_cpu). To do otherwise would
mean that the RCU grace-period kthreads would force the system into
non-idle state every time they drove the state machine, which would
be just a bit on the futile side.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcutree.c')
| -rw-r--r-- | kernel/rcutree.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c index eca70f4469c1..64eaafb6c8f7 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -1303,6 +1303,7 @@ static int rcu_gp_init(struct rcu_state *rsp) struct rcu_data *rdp; struct rcu_node *rnp = rcu_get_root(rsp); + rcu_bind_gp_kthread(); raw_spin_lock_irq(&rnp->lock); rsp->gp_flags = 0; /* Clear all flags: New grace period. */ |