diff options
| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-07-11 20:30:24 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-09-16 19:08:02 +0200 |
| commit | 35ce7f29a44a888c45c0a9f202f69e10613c5306 (patch) | |
| tree | 71d72916c0582574a4317aaabd4f24291547326b /kernel/rcu/tree.h | |
| parent | rcu: Rationalize kthread spawning (diff) | |
| download | linux-35ce7f29a44a888c45c0a9f202f69e10613c5306.tar.xz linux-35ce7f29a44a888c45c0a9f202f69e10613c5306.zip | |
rcu: Create rcuo kthreads only for onlined CPUs
RCU currently uses for_each_possible_cpu() to spawn rcuo kthreads,
which can result in more rcuo kthreads than one would expect, for
example, derRichard reported 64 CPUs worth of rcuo kthreads on an
8-CPU image. This commit therefore creates rcuo kthreads only for
those CPUs that actually come online.
This was reported by derRichard on the OFTC IRC network.
Reported-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Tested-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Diffstat (limited to 'kernel/rcu/tree.h')
| -rw-r--r-- | kernel/rcu/tree.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index a966092fdfd7..a9a226d2e80a 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -593,7 +593,11 @@ static bool rcu_nocb_adopt_orphan_cbs(struct rcu_state *rsp, static bool rcu_nocb_need_deferred_wakeup(struct rcu_data *rdp); static void do_nocb_deferred_wakeup(struct rcu_data *rdp); static void rcu_boot_init_nocb_percpu_data(struct rcu_data *rdp); -static void rcu_spawn_nocb_kthreads(struct rcu_state *rsp); +static void rcu_spawn_all_nocb_kthreads(int cpu); +static void __init rcu_spawn_nocb_kthreads(void); +#ifdef CONFIG_RCU_NOCB_CPU +static void __init rcu_organize_nocb_kthreads(struct rcu_state *rsp); +#endif /* #ifdef CONFIG_RCU_NOCB_CPU */ static void __maybe_unused rcu_kick_nohz_cpu(int cpu); static bool init_nocb_callback_list(struct rcu_data *rdp); static void rcu_sysidle_enter(struct rcu_dynticks *rdtp, int irq); |