Re: [2/3 PATCH] Kprobes: User space probes support- readpage hooks

Theodore Ts'o
2006-03-21T12:41:19Z

On Tue, Mar 21, 2006 at 11:14:52AM +0000, Christoph Hellwig wrote:
> > A real life example of where this capability would have been very useful is
> > with a performance problem I am currently investigating. It involves a GPFS
> > + SAMBA + TCPIP + RDAC
>
> this pobablt tells more about the crappy code quality of your propritary
> code than a real need for this. please argue without reference to huge
> blobs of junk.

In real life there are complicated stacks; sometimes they are open
source (for example, like JBoss or Tomcat), sometimes they are
propietary products, sometimes they are custom applications written by
the end-user. Sun has been making big hay about how with dtrace, you
can easily figure out what is going on. Systemtap is a tool that will
allow us to have have this kind of capability, and user space probes
is part of that project.

- Ted