Hello Zvika,
On 2024-03-29 01:09, Zvi Vered via lttng-dev wrote:
Hi Christopher,
Thank you very much for your reply.
Can you please explain what do you mean by ftrace-enabled kernel ?
I believe what Christopher means by "ftrace-enabled" kernel is that the
Linux kernel has been configured to include ftrace. Both the ftrace
tracer and the LTTng tracer use the same kernel tracepoints to extract
execution information and these tracepoints are included in the kernel
if ftrace is included.
Most Linux distributions will include ftrace by default. However, you
can check whether this is the case by searching for `tracefs` in
`/proc/filesystems` (assuming it's already mounted) or by trying to
mount `tracefs`. `tracefs` is the filesystem ftrace uses to communicate
with users.
More details about how to check if ftrace is enabled and how to enable
it if not:
https://wiki.linuxfoundation.org/realtime/documentation/howto/tools/ftrace
The "More Information" section points to the primary sources (Linux
kernel documentation), but I find this page to be a good starting point.
Best,
Erica
Best regards,
Zvika
On Wed, Mar 27, 2024 at 7:32 PM Christopher Harvey via lttng-dev
<lttng-dev@lists.lttng.org <mailto:lttng-dev@lists.lttng.org>> wrote:
you can use an ftrace-enabled kernel with lttng (maybe even just
tracecompass) or perfetto to get that kind of trace
https://archive.eclipse.org/tracecompass.incubator/doc/org.eclipse.tracecompass.incubator.ftrace.doc.user/User-Guide.html
<https://archive.eclipse.org/tracecompass.incubator/doc/org.eclipse.tracecompass.incubator.ftrace.doc.user/User-Guide.html>
or
https://ui.perfetto.dev/ <https://ui.perfetto.dev/>
On Wed, Mar 27, 2024, at 5:26 AM, Zvi Vered via lttng-dev wrote:
> Hello,
>
> I have an application with 4 threads.
> I'm required to display on the graph when thread starts working
till it
> blocks for the next semaphore.
>
> But without using the lttng userspace library.
>
> Is it possible ?
>
> Thank you,
> Zvika
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