You can use kernel dynamic debugging(echo 'file rbd.c +p' >
/sys/kernel/debug/dynamic_debug/control) or systemtap.

On Sun, Jun 21, 2020 at 5:08 PM Abhinav Singh
<singhabhinav0796@gmail.com> wrote:
>
> Hey Dan,
> can you please tell me how can I attach my gdb to rbd so that I can see whole req flow step by step with its help
>
> On Sun, 21 Jun 2020, 05:03 Dan Mick, <dmick@redhat.com> wrote:
>>
>> On 6/20/2020 10:14 AM, Abhinav Singh wrote:
>> > Hello everyone,
>> > To understand the flow of rgw I used the ceph cluster by this "RGW=1
>> > ../src/vstart.sh -d -n -x"
>> > and then "ps ax|grep rgw" command will give me the pid of rgw server,
>> > and then I used to do "gdb -p ${pid}" obtained from above.
>> > Now I want to understand RBD work flow but when I do "ps ax|grep rbd"
>> > then it is not showing any process related to "rbd" , I even tried it
>> > with "RBD=1 ../src/vstart.sh -d -n -x"
>> > but it did not work.
>> >
>> > Can anyone tell how to find pid process of rbd server?, or so that I can
>> > attach gdb to it.
>>
>> rbd isn't a separate process.  It's a kernel block driver and/or a
>> userland library.
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