Le Wed, Oct 09, 2024 at 11:07:19AM -0700, Paul E. McKenney a écrit :
> 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@xxxxxxxxxx>
> Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
> Cc: Andrii Nakryiko <andrii@xxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
> Cc: <bpf@xxxxxxxxxxxxxxx>
This one does not apply cleanly. I assume there is some dependency to another
branch?
Thanks.
> ---
> kernel/rcu/refscale.c | 51 +++++++++++++++++++++++++++++++++----------
> 1 file changed, 40 insertions(+), 11 deletions(-)
>
> diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
> index be66e5a67ee19..897d5b5494949 100644
> --- a/kernel/rcu/refscale.c
> +++ b/kernel/rcu/refscale.c
> @@ -216,6 +216,36 @@ 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.
> @@ -1133,27 +1163,26 @@ 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, &sched_clock_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,
> + &sched_clock_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)
> --
> 2.40.1
>
