Commit 88337b58 authored by Kumar Kartikeya Dwivedi's avatar Kumar Kartikeya Dwivedi Committed by Alexei Starovoitov
Browse files

selftests/bpf: Make CS length configurable for rqspinlock stress test 



Allow users to configure the critical section delay for both task/normal
and NMI contexts, and set to 20ms and 10ms as before by default.

Signed-off-by: default avatarKumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20251125020749.2421610-4-memxor@gmail.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 6173c1d6

tools/testing/selftests/bpf/test_kmods/bpf_test_rqspinlock.c

+12 −2
Original line number Diff line number Diff line
@@ -51,6 +51,16 @@ module_param(test_mode, int, 0644); 
MODULE_PARM_DESC(test_mode,

		 "rqspinlock test mode: 0 = AA, 1 = ABBA, 2 = ABBCCA");



static int normal_delay = 20;

module_param(normal_delay, int, 0644);

MODULE_PARM_DESC(normal_delay,

		 "rqspinlock critical section length for normal context (20ms default)");



static int nmi_delay = 10;

module_param(nmi_delay, int, 0644);

MODULE_PARM_DESC(nmi_delay,

		 "rqspinlock critical section length for NMI context (10ms default)");



static struct perf_event **rqsl_evts;

static int rqsl_nevts;
@@ -138,7 +148,7 @@ static int rqspinlock_worker_fn(void *arg) 
			start_ns = ktime_get_mono_fast_ns();

			ret = raw_res_spin_lock_irqsave(worker_lock, flags);

			rqsl_record_lock_time(ktime_get_mono_fast_ns() - start_ns, false);

			mdelay(20);

			mdelay(normal_delay);

			if (!ret)

				raw_res_spin_unlock_irqrestore(worker_lock, flags);

			cpu_relax();
@@ -182,7 +192,7 @@ static void nmi_cb(struct perf_event *event, struct perf_sample_data *data, 
	ret = raw_res_spin_lock_irqsave(locks.nmi_lock, flags);

	rqsl_record_lock_time(ktime_get_mono_fast_ns() - start_ns, true);



	mdelay(10);

	mdelay(nmi_delay);



	if (!ret)

		raw_res_spin_unlock_irqrestore(locks.nmi_lock, flags);