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refscale: Add local_bh_disable() readers

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This commit adds refscale readers based on local_bh_disable() and
local_bh_enable() ("refscale.scale_type=bh").  On my x86 laptop, these
are about 4.9ns.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
This commit is contained in:
Paul E. McKenney
2025-11-02 14:49:43 -08:00
committed by Frederic Weisbecker
parent edd6f78b75
commit 78a731cefc
1 changed files with 33 additions and 1 deletions
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34
kernel/rcu/refscale.c
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@@ -629,6 +629,37 @@ static const struct ref_scale_ops jiffies_ops = {
.name = "jiffies"
};
static void ref_bh_section(const int nloops)
{
int i;
preempt_disable();
for (i = nloops; i >= 0; i--) {
local_bh_disable();
local_bh_enable();
}
preempt_enable();
}
static void ref_bh_delay_section(const int nloops, const int udl, const int ndl)
{
int i;
preempt_disable();
for (i = nloops; i >= 0; i--) {
local_bh_disable();
un_delay(udl, ndl);
local_bh_enable();
}
preempt_enable();
}
static const struct ref_scale_ops bh_ops = {
.readsection = ref_bh_section,
.delaysection = ref_bh_delay_section,
.name = "bh"
};
static void ref_irq_section(const int nloops)
{
int i;
@@ -1229,7 +1260,8 @@ ref_scale_init(void)
static const struct ref_scale_ops *scale_ops[] = {
&rcu_ops, &srcu_ops, &srcu_fast_ops, RCU_TRACE_OPS RCU_TASKS_OPS
&refcnt_ops, &rwlock_ops, &rwsem_ops, &lock_ops, &lock_irq_ops,
&acqrel_ops, &sched_clock_ops, &clock_ops, &jiffies_ops, &irq_ops, &irqsave_ops,
&acqrel_ops, &sched_clock_ops, &clock_ops, &jiffies_ops,
&bh_ops, &irq_ops, &irqsave_ops,
&typesafe_ref_ops, &typesafe_lock_ops, &typesafe_seqlock_ops,
};