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refscale: Add srcu_read_lock_fast() support using "srcu-fast"

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This commit creates a new srcu-fast option for the refscale.scale_type
module parameter that selects srcu_read_lock_fast() and
srcu_read_unlock_fast().

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: <bpf@vger.kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
This commit is contained in:
Paul E. McKenney 2025-01-09 16:32:31 -08:00 committed by Boqun Feng
parent 176d19eecb
commit 4c3fca0f59
1 changed files with 31 additions and 1 deletions
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32
kernel/rcu/refscale.c
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@ -216,6 +216,36 @@ static const struct ref_scale_ops srcu_ops = {
.name = "srcu"
};
static void srcu_fast_ref_scale_read_section(const int nloops)
{
int i;
struct srcu_ctr __percpu *scp;
for (i = nloops; i >= 0; i--) {
scp = srcu_read_lock_fast(srcu_ctlp);
srcu_read_unlock_fast(srcu_ctlp, scp);
}
}
static void srcu_fast_ref_scale_delay_section(const int nloops, const int udl, const int ndl)
{
int i;
struct srcu_ctr __percpu *scp;
for (i = nloops; i >= 0; i--) {
scp = srcu_read_lock_fast(srcu_ctlp);
un_delay(udl, ndl);
srcu_read_unlock_fast(srcu_ctlp, scp);
}
}
static const struct ref_scale_ops srcu_fast_ops = {
.init = rcu_sync_scale_init,
.readsection = srcu_fast_ref_scale_read_section,
.delaysection = srcu_fast_ref_scale_delay_section,
.name = "srcu-fast"
};
static void srcu_lite_ref_scale_read_section(const int nloops)
{
int i;
@ -1163,7 +1193,7 @@ ref_scale_init(void)
long i;
int firsterr = 0;
static const struct ref_scale_ops *scale_ops[] = {
&rcu_ops, &srcu_ops, &srcu_lite_ops, RCU_TRACE_OPS RCU_TASKS_OPS
&rcu_ops, &srcu_ops, &srcu_fast_ops, &srcu_lite_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,
&typesafe_ref_ops, &typesafe_lock_ops, &typesafe_seqlock_ops,