@@ -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.
@@ -1082,27 +1112,26 @@ 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))
return -EBUSY;
for (i = 0; i < ARRAY_SIZE(scale_ops); i++) {
- cur_ops = scale_ops[i];
- if (strcmp(scale_type, cur_ops->name) == 0)
+ cur_ops = scale_ops[i]; if (strcmp(scale_type,
+ cur_ops->name) == 0)
break;
}
if (i == ARRAY_SIZE(scale_ops)) {
- pr_alert("rcu-scale: invalid scale type: \"%s\"\n", scale_type);
- pr_alert("rcu-scale types:");
- for (i = 0; i < ARRAY_SIZE(scale_ops); i++)
+ pr_alert("rcu-scale: invalid scale type: \"%s\"\n",
+ scale_type); pr_alert("rcu-scale types:"); for (i = 0;
+ i < ARRAY_SIZE(scale_ops); i++)
pr_cont(" %s", scale_ops[i]->name);
- pr_cont("\n");
- firsterr = -EINVAL;
- cur_ops = NULL;
+ pr_cont("\n"); firsterr = -EINVAL; cur_ops = NULL;
goto unwind;
}
if (cur_ops->init)
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(). 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> --- kernel/rcu/refscale.c | 51 +++++++++++++++++++++++++++++++++---------- 1 file changed, 40 insertions(+), 11 deletions(-)