Commit-ID: 8f5af6f1f2d09fe5eac86a5dc1731a5917c1503a Gitweb: http://git.kernel.org/tip/8f5af6f1f2d09fe5eac86a5dc1731a5917c1503a Author: Paul E. McKenney <paul.mckenney@xxxxxxxxxx> AuthorDate: Fri, 4 May 2012 08:31:53 -0700 Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> CommitDate: Wed, 6 Jun 2012 20:43:27 -0700 rcu: RCU_FAST_NO_HZ detection of callback adoption In the present implementations of CPU hotplug, the outgoing CPU is guaranteed to run its stop-machine process on the way out, which will guarantee that RCU_FAST_NO_HZ forces the CPU out of dyntick-idle mode. However, new versions of CPU hotplug might not work this way. This commit therefore removes this design constraint by explicitly notifying CPUs when they adopt non-lazy RCU callbacks. Signed-off-by: Paul E. McKenney <paul.mckenney@xxxxxxxxxx> Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> Tested-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx> Tested-by: Pascal Chapperon <pascal.chapperon@xxxxxxxxxx> --- kernel/rcutree.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 0da7b88..3b0f133 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -1397,6 +1397,8 @@ static void rcu_adopt_orphan_cbs(struct rcu_state *rsp) rdp->qlen_lazy += rsp->qlen_lazy; rdp->qlen += rsp->qlen; rdp->n_cbs_adopted += rsp->qlen; + if (rsp->qlen_lazy != rsp->qlen) + rcu_idle_count_callbacks_posted(); rsp->qlen_lazy = 0; rsp->qlen = 0; -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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