Adding a new VFS Lttng module for performance testing

Ralph Böhme slow at
Mon Oct 22 14:08:31 UTC 2018

On Mon, Oct 22, 2018 at 10:16:08AM +0800, deanraccoon via samba-technical wrote:
>dear list
>    I have submit a patch:
>   This will help the performace test, Could someone review it ?

I wonder whether this buys us anything a Systemtap (or the upcoming bpftrace) 
script wouln't be able to get us without requiring a VFS module?

Most VFS functions are just abstractions for syscalls, so tracing those is a no 
brainer. Stuff like create_file will require debuginfo, but then again debuginfo 
is needed anyway for (postmortem) diagnosis.

Just wondering...


Ralph Boehme, Samba Team
Samba Developer, SerNet GmbH
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