On Mon, 24 Jul 2017 21:40:24 +
"Brandt, Todd E" wrote:
> Function graph tracing is indeed the target, as its the basis of the
> bootgraph
> tool. However, kprobes would work just as well. What's the difference in
> effort
> between enabling kprobes for early boot vs function graph trace?
>
Steven Rostedt writes:
> On Mon, 24 Jul 2017 13:46:07 +0800
> "Huang\, Ying" wrote:
>
>> Hi, Steven,
>>
>> We are working on parallelizing secondary CPU bootup. So we need to
>> measure the bootup time of secondary CPU, that is, measure time spent in
>> smp_init() and its callees. But we fou
>
> On Mon, 24 Jul 2017 13:46:07 +0800
> "Huang\, Ying" wrote:
>
> > Hi, Steven,
> >
> > We are working on parallelizing secondary CPU bootup. So we need to
> > measure the bootup time of secondary CPU, that is, measure time spent in
> > smp_init() and its callees. But we found that ftrace no
On Mon, 24 Jul 2017 13:46:07 +0800
"Huang\, Ying" wrote:
> Hi, Steven,
>
> We are working on parallelizing secondary CPU bootup. So we need to
> measure the bootup time of secondary CPU, that is, measure time spent in
> smp_init() and its callees. But we found that ftrace now doesn't
> suppor
Hi, Steven,
We are working on parallelizing secondary CPU bootup. So we need to
measure the bootup time of secondary CPU, that is, measure time spent in
smp_init() and its callees. But we found that ftrace now doesn't
support measure time spent in smp_init() because it is called too early
(befo
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