diff options
Diffstat (limited to 'kernel/trace/trace_hwlat.c')
| -rw-r--r-- | kernel/trace/trace_hwlat.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c index 862f4b0139fc..6638d63f0921 100644 --- a/kernel/trace/trace_hwlat.c +++ b/kernel/trace/trace_hwlat.c @@ -1,6 +1,6 @@ // 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. @@ -237,6 +237,7 @@ static int get_sample(void) /* 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; @@ -253,11 +254,13 @@ static int get_sample(void) 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: @@ -276,7 +279,7 @@ static void move_to_next_cpu(void) 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)) |