Hi Steve,
On Sat, Jul 18, 2020 at 4:44 AM Steven Rostedt wrote:
>
> On Fri, 17 Jul 2020 16:34:55 -0300
> Arnaldo Carvalho de Melo wrote:
>
> Thinking a bit more, I have to ask. Does perf use the kernel when
> getting all the children of an existing task, or is that done only in
> userspace?
>
>
On Fri, Jul 17, 2020 at 01:01:24PM -0400, Steven Rostedt wrote:
> On Fri, 17 Jul 2020 21:26:50 +0800
> Changbin Du wrote:
>
> > On Thu, Jul 16, 2020 at 12:36:30PM -0300, Arnaldo Carvalho de Melo wrote:
> > > Em Sat, Jul 11, 2020 at 08:40:21PM +0800, Changbin Du escreveu:
> > > > This allows us
On Fri, 17 Jul 2020 16:34:55 -0300
Arnaldo Carvalho de Melo wrote:
Thinking a bit more, I have to ask. Does perf use the kernel when
getting all the children of an existing task, or is that done only in
userspace?
That is, is there a perf syscall that says "start tracing this task and
all its ex
Em Fri, Jul 17, 2020 at 01:53:51PM -0400, Steven Rostedt escreveu:
> On Fri, 17 Jul 2020 14:40:53 -0300 Arnaldo Carvalho de Melo
> wrote:
> > Say you use:
> > ^C[root@ssdandy ~]# cyclictest --smp -um -p95
> > # /dev/cpu_dma_latency set to 0us
> > policy: fifo: loadavg: 0.05 0.03 0.06 2/409 290
On Fri, 17 Jul 2020 14:40:53 -0300
Arnaldo Carvalho de Melo wrote:
> Say you use:
>
> ^C[root@ssdandy ~]# cyclictest --smp -um -p95
> # /dev/cpu_dma_latency set to 0us
> policy: fifo: loadavg: 0.05 0.03 0.06 2/409 29072
>
> T: 0 (29065) P:95 I:1000 C:518 Min: 2 Act:2 Avg:2 Max:
Em Fri, Jul 17, 2020 at 01:01:24PM -0400, Steven Rostedt escreveu:
> On Fri, 17 Jul 2020 21:26:50 +0800
> Changbin Du wrote:
>
> > On Thu, Jul 16, 2020 at 12:36:30PM -0300, Arnaldo Carvalho de Melo wrote:
> > > Em Sat, Jul 11, 2020 at 08:40:21PM +0800, Changbin Du escreveu:
> > > > This allows
On Fri, 17 Jul 2020 21:26:50 +0800
Changbin Du wrote:
> On Thu, Jul 16, 2020 at 12:36:30PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Sat, Jul 11, 2020 at 08:40:21PM +0800, Changbin Du escreveu:
> > > This allows us to trace single thread instead of the whole process.
> > >
> > > Signed-off
Em Fri, Jul 17, 2020 at 09:26:50PM +0800, Changbin Du escreveu:
> On Thu, Jul 16, 2020 at 12:36:30PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Sat, Jul 11, 2020 at 08:40:21PM +0800, Changbin Du escreveu:
> > > +++ b/tools/perf/Documentation/perf-ftrace.txt
> > > @@ -38,6 +38,10 @@ OPTIONS
> > >
On Thu, Jul 16, 2020 at 12:36:30PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Sat, Jul 11, 2020 at 08:40:21PM +0800, Changbin Du escreveu:
> > This allows us to trace single thread instead of the whole process.
> >
> > Signed-off-by: Changbin Du
> > ---
> > tools/perf/Documentation/perf-ftrace.
Em Sat, Jul 11, 2020 at 08:40:21PM +0800, Changbin Du escreveu:
> This allows us to trace single thread instead of the whole process.
>
> Signed-off-by: Changbin Du
> ---
> tools/perf/Documentation/perf-ftrace.txt | 4
> tools/perf/builtin-ftrace.c | 2 ++
> 2 files changed, 6
This allows us to trace single thread instead of the whole process.
Signed-off-by: Changbin Du
---
tools/perf/Documentation/perf-ftrace.txt | 4
tools/perf/builtin-ftrace.c | 2 ++
2 files changed, 6 insertions(+)
diff --git a/tools/perf/Documentation/perf-ftrace.txt
b/tools/
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