* [PATCH] tracing: hwlat: update old comment
@ 2017-02-13 17:25 Luiz Capitulino
2017-02-14 20:05 ` Steven Rostedt
0 siblings, 1 reply; 2+ messages in thread
From: Luiz Capitulino @ 2017-02-13 17:25 UTC (permalink / raw)
To: linux-kernel; +Cc: rostedt
The ftrace hwlat does support a cpumask.
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
kernel/trace/trace_hwlat.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
index af344a1b..1199fe1 100644
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -322,10 +322,7 @@ static void move_to_next_cpu(bool initmask)
* need to ensure nothing else might be running (and thus preempting).
* Obviously this should never be used in production environments.
*
- * Currently this runs on which ever CPU it was scheduled on, but most
- * real-world hardware latency situations occur across several CPUs,
- * but we might later generalize this if we find there are any actualy
- * systems with alternate SMI delivery or other hardware latencies.
+ * Executes one loop interaction on each CPU in tracing_cpumask sysfs file.
*/
static int kthread_fn(void *data)
{
--
2.5.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] tracing: hwlat: update old comment
2017-02-13 17:25 [PATCH] tracing: hwlat: update old comment Luiz Capitulino
@ 2017-02-14 20:05 ` Steven Rostedt
0 siblings, 0 replies; 2+ messages in thread
From: Steven Rostedt @ 2017-02-14 20:05 UTC (permalink / raw)
To: Luiz Capitulino; +Cc: linux-kernel
On Mon, 13 Feb 2017 12:25:17 -0500
Luiz Capitulino <lcapitulino@redhat.com> wrote:
> The ftrace hwlat does support a cpumask.
>
> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Thanks! Applied.
-- Steve
> ---
> kernel/trace/trace_hwlat.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
> index af344a1b..1199fe1 100644
> --- a/kernel/trace/trace_hwlat.c
> +++ b/kernel/trace/trace_hwlat.c
> @@ -322,10 +322,7 @@ static void move_to_next_cpu(bool initmask)
> * need to ensure nothing else might be running (and thus preempting).
> * Obviously this should never be used in production environments.
> *
> - * Currently this runs on which ever CPU it was scheduled on, but most
> - * real-world hardware latency situations occur across several CPUs,
> - * but we might later generalize this if we find there are any actualy
> - * systems with alternate SMI delivery or other hardware latencies.
> + * Executes one loop interaction on each CPU in tracing_cpumask sysfs file.
> */
> static int kthread_fn(void *data)
> {
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2017-02-14 20:05 ` Steven Rostedt
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