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| author | Paul E. McKenney <paulmck@linux.ibm.com> | 2019-06-01 14:14:47 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.ibm.com> | 2019-08-13 23:35:49 +0200 |
| commit | 9fcb09bddd56bae42319b606bae86e85c625f868 (patch) | |
| tree | 89cccab3be8d16aaf2991239b8f03b18afdb9629 /kernel/rcu | |
| parent | rcu/nocb: Avoid ->nocb_lock capture by corresponding CPU (diff) | |
| download | linux-9fcb09bddd56bae42319b606bae86e85c625f868.tar.xz linux-9fcb09bddd56bae42319b606bae86e85c625f868.zip | |
rcu/nocb: Round down for number of no-CBs grace-period kthreads
Currently, when the square root of the number of CPUs is rounded down
by int_sqrt(), this round-down is applied to the number of callback
kthreads per grace-period kthreads. This makes almost no difference
for large systems, but results in oddities such as three no-CBs
grace-period kthreads for a five-CPU system, which is a bit excessive.
This commit therefore causes the round-down to apply to the number of
no-CBs grace-period kthreads, so that systems with from four to eight
CPUs have only two no-CBs grace period kthreads.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 5f0894cec75d..12212764ecd8 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -2028,7 +2028,7 @@ static void __init rcu_organize_nocb_kthreads(void) if (!cpumask_available(rcu_nocb_mask)) return; if (ls == -1) { - ls = int_sqrt(nr_cpu_ids); + ls = nr_cpu_ids / int_sqrt(nr_cpu_ids); rcu_nocb_gp_stride = ls; } |