Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1542452
| From | Boqun Feng <boqun.feng@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [RFC v2 5/5] rcu: Use for_each_leaf_node_cpu() in online CPU iteration |
| Date | 2016-12-15 03:50 +0100 |
| Message-ID | <sOuhj-8sr-13@gated-at.bofh.it> (permalink) |
| References | <sOuhj-8sr-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Though mostly identical, ->qsmaskinit(A.K.A rcu_rnp_online_cpus()) is sometimes more sparse than the corresponding part of cpu_possible_mask for an RCU leaf node. So we use for_each_leaf_node_cpu() in rcu_boost_kthread_setaffinity() instead to save some extra checks. Signed-off-by: Boqun Feng <boqun.feng@gmail.com> --- kernel/rcu/tree_plugin.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 69c6eb27c37f..93cebd940a93 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -1175,10 +1175,11 @@ static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu) return; if (!zalloc_cpumask_var(&cm, GFP_KERNEL)) return; - for_each_leaf_node_possible_cpu(rnp, cpu) - if ((mask & leaf_node_cpu_bit(rnp, cpu)) && - cpu != outgoingcpu) + + for_each_leaf_node_cpu(rnp, mask, cpu) + if (cpu != outgoingcpu) cpumask_set_cpu(cpu, cm); + if (cpumask_weight(cm) == 0) cpumask_setall(cm); set_cpus_allowed_ptr(t, cm); -- 2.10.2
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[RFC v2 0/5] rcu: Introduce for_each_leaf_node_cpu() Boqun Feng <boqun.feng@gmail.com> - 2016-12-15 03:50 +0100
[RFC v2 1/5] rcu: Introduce for_each_leaf_node_cpu() Boqun Feng <boqun.feng@gmail.com> - 2016-12-15 03:50 +0100
Re: [RFC v2 1/5] rcu: Introduce for_each_leaf_node_cpu() Mark Rutland <mark.rutland@arm.com> - 2016-12-15 12:50 +0100
Re: [RFC v2 1/5] rcu: Introduce for_each_leaf_node_cpu() Boqun Feng <boqun.feng@gmail.com> - 2016-12-15 15:40 +0100
Re: [RFC v2 1/5] rcu: Introduce for_each_leaf_node_cpu() Boqun Feng <boqun.feng@gmail.com> - 2016-12-15 16:20 +0100
Re: [RFC v2 1/5] rcu: Introduce for_each_leaf_node_cpu() Mark Rutland <mark.rutland@arm.com> - 2016-12-15 16:20 +0100
[RFC v2.1 1/5] rcu: Introduce for_each_leaf_node_cpu() Boqun Feng <boqun.feng@gmail.com> - 2016-12-15 16:30 +0100
Re: [RFC v2.1 1/5] rcu: Introduce for_each_leaf_node_cpu() Mark Rutland <mark.rutland@arm.com> - 2016-12-15 16:40 +0100
[RFC v2 2/5] rcu: Use for_each_leaf_node_cpu() in RCU stall checking Boqun Feng <boqun.feng@gmail.com> - 2016-12-15 03:50 +0100
[RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() Boqun Feng <boqun.feng@gmail.com> - 2016-12-15 03:50 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() Mark Rutland <mark.rutland@arm.com> - 2016-12-15 13:10 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() Boqun Feng <boqun.feng@gmail.com> - 2016-12-15 15:50 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() Colin Ian King <colin.king@canonical.com> - 2016-12-15 16:00 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() Boqun Feng <boqun.feng@gmail.com> - 2016-12-19 16:20 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-12-20 06:10 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() Boqun Feng <boqun.feng@gmail.com> - 2016-12-20 07:00 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() Boqun Feng <boqun.feng@gmail.com> - 2016-12-20 09:20 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-12-20 16:40 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-12-20 16:30 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() Boqun Feng <boqun.feng@gmail.com> - 2016-12-21 03:40 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-12-21 04:50 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() Boqun Feng <boqun.feng@gmail.com> - 2016-12-21 05:20 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-12-21 17:50 +0100
Re: [RFC v2 4/5] rcu: Use for_each_leaf_node_cpu() in force_qs_rnp() Boqun Feng <boqun.feng@gmail.com> - 2016-12-22 02:10 +0100
[RFC v2 5/5] rcu: Use for_each_leaf_node_cpu() in online CPU iteration Boqun Feng <boqun.feng@gmail.com> - 2016-12-15 03:50 +0100
[RFC v2 3/5] rcu: Use for_each_leaf_node_cpu() in ->expmask iteration Boqun Feng <boqun.feng@gmail.com> - 2016-12-15 03:50 +0100
csiph-web