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refscale: Add srcu_read_lock_lite() support using "srcu-lite"

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This commit creates a new srcu-lite option for the refscale.scale_type
module parameter that selects srcu_read_lock_lite() and
srcu_read_unlock_lite().

[ paulmck: Apply Dan Carpenter feedback. ]

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>
Reviewed-by: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
This commit is contained in:
Paul E. McKenney 2024-10-28 17:25:12 -07:00 committed by Frederic Weisbecker
parent 930d4e1344
commit 6a2c0255e8
1 changed files with 34 additions and 3 deletions
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37
kernel/rcu/refscale.c
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@ -212,6 +212,36 @@ static const struct ref_scale_ops srcu_ops = {
.name = "srcu"
};
static void srcu_lite_ref_scale_read_section(const int nloops)
{
int i;
int idx;
for (i = nloops; i >= 0; i--) {
idx = srcu_read_lock_lite(srcu_ctlp);
srcu_read_unlock_lite(srcu_ctlp, idx);
}
}
static void srcu_lite_ref_scale_delay_section(const int nloops, const int udl, const int ndl)
{
int i;
int idx;
for (i = nloops; i >= 0; i--) {
idx = srcu_read_lock_lite(srcu_ctlp);
un_delay(udl, ndl);
srcu_read_unlock_lite(srcu_ctlp, idx);
}
}
static const struct ref_scale_ops srcu_lite_ops = {
.init = rcu_sync_scale_init,
.readsection = srcu_lite_ref_scale_read_section,
.delaysection = srcu_lite_ref_scale_delay_section,
.name = "srcu-lite"
};
#ifdef CONFIG_TASKS_RCU
// Definitions for RCU Tasks ref scale testing: Empty read markers.
@ -1082,9 +1112,10 @@ ref_scale_init(void)
long i;
int firsterr = 0;
static const struct ref_scale_ops *scale_ops[] = {
&rcu_ops, &srcu_ops, RCU_TRACE_OPS RCU_TASKS_OPS &refcnt_ops, &rwlock_ops,
&rwsem_ops, &lock_ops, &lock_irq_ops, &acqrel_ops, &clock_ops, &jiffies_ops,
&typesafe_ref_ops, &typesafe_lock_ops, &typesafe_seqlock_ops,
&rcu_ops, &srcu_ops, &srcu_lite_ops, RCU_TRACE_OPS RCU_TASKS_OPS
&refcnt_ops, &rwlock_ops, &rwsem_ops, &lock_ops, &lock_irq_ops, &acqrel_ops,
&clock_ops, &jiffies_ops, &typesafe_ref_ops, &typesafe_lock_ops,
&typesafe_seqlock_ops,
};
if (!torture_init_begin(scale_type, verbose))