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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-07-11 22:30:24 +0400 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-09-16 21:08:02 +0400 |
| commit | 35ce7f29a44a888c45c0a9f202f69e10613c5306 (patch) | |
| tree | 71d72916c0582574a4317aaabd4f24291547326b /kernel/rcu/tree.c | |
| parent | 9386c0b75dda05f535a10ea1abf1817fe292c81c (diff) | |
| download | linux-35ce7f29a44a888c45c0a9f202f69e10613c5306.tar.xz | |
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.c')
| -rw-r--r-- | kernel/rcu/tree.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 9be47f43903b..b49c8433f834 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3442,6 +3442,7 @@ static int rcu_cpu_notify(struct notifier_block *self, case CPU_UP_PREPARE_FROZEN: rcu_prepare_cpu(cpu); rcu_prepare_kthreads(cpu); + rcu_spawn_all_nocb_kthreads(cpu); break; case CPU_ONLINE: case CPU_DOWN_FAILED: @@ -3506,8 +3507,8 @@ static int __init rcu_spawn_gp_kthread(void) raw_spin_lock_irqsave(&rnp->lock, flags); rsp->gp_kthread = t; raw_spin_unlock_irqrestore(&rnp->lock, flags); - rcu_spawn_nocb_kthreads(rsp); } + rcu_spawn_nocb_kthreads(); rcu_spawn_boost_kthreads(); return 0; } |