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

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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: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20251125020749.2421610-4-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kumar Kartikeya Dwivedi
2025-11-25 02:07:49 +00:00
committed by Alexei Starovoitov
parent 6173c1d620
commit 88337b587b
1 changed files with 12 additions and 2 deletions
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14
tools/testing/selftests/bpf/test_kmods/bpf_test_rqspinlock.c
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@@ -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);