Commit 4c3fca0f authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Boqun Feng
Browse files

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



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: default avatarPaul 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: default avatarBoqun Feng <boqun.feng@gmail.com>
parent 176d19ee

kernel/rcu/refscale.c

+31 −1
Original line number Diff line number Diff line
@@ -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,