Messages in this thread | | | Date | Tue, 21 Mar 2006 07:40:58 -0500 | From | Theodore Ts'o <> | Subject | Re: [2/3 PATCH] Kprobes: User space probes support- readpage hooks |
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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.
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