// SPDX-License-Identifier: GPL-2.0
/*
- * trace_hwlatdetect.c - A simple Hardware Latency detector.
+ * trace_hwlat.c - A simple Hardware Latency detector.
*
* Use this tracer to detect large system latencies induced by the behavior of
* certain underlying system hardware or firmware, independent of Linux itself.
{
struct trace_array *tr = hwlat_trace;
struct trace_event_call *call = &event_hwlat;
- struct ring_buffer *buffer = tr->trace_buffer.buffer;
+ struct trace_buffer *buffer = tr->array_buffer.buffer;
struct ring_buffer_event *event;
struct hwlat_entry *entry;
unsigned long flags;
/* If we exceed the threshold value, we have found a hardware latency */
if (sample > thresh || outer_sample > thresh) {
struct hwlat_sample s;
+ u64 latency;
ret = 1;
s.nmi_count = nmi_count;
trace_hwlat_sample(&s);
+ latency = max(sample, outer_sample);
+
/* Keep a running maximum ever recorded hardware latency */
- if (sample > tr->max_latency)
- tr->max_latency = sample;
- if (outer_sample > tr->max_latency)
- tr->max_latency = outer_sample;
+ if (latency > tr->max_latency) {
+ tr->max_latency = latency;
+ latency_fsnotify(tr);
+ }
}
out:
return;
/*
* If for some reason the user modifies the CPU affinity
- * of this thread, than stop migrating for the duration
+ * of this thread, then stop migrating for the duration
* of the current test.
*/
if (!cpumask_equal(current_mask, current->cpus_ptr))