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Re: [...] kprobes [minutes] portion 20060406
- From: Prasanna S Panchamukhi <prasanna at in dot ibm dot com>
- To: "Frank Ch. Eigler" <fche at redhat dot com>
- Cc: Hien Q Nguyen <nguyhien at us dot ibm dot com>, systemtap at sources dot redhat dot com
- Date: Fri, 7 Apr 2006 13:55:17 +0530
- Subject: Re: [...] kprobes [minutes] portion 20060406
- References: <OF450EB249.F3B0B23E-ON88257148.00738621-88257148.0074730E@us.ibm.com> <20060406212838.GB22703@redhat.com>
- Reply-to: prasanna at in dot ibm dot com
On Thu, Apr 06, 2006 at 05:28:38PM -0400, Frank Ch. Eigler wrote:
> Hi -
>
> On Thu, Apr 06, 2006 at 02:14:46PM -0700, Hien Q Nguyen wrote:
> > User space probe
> > Prasanna had prototype that execute the handler in the user space [...]
>
> Beyond merely dispatching, it is important to consider what such a
> handler can do. Would it still be useful if it cannot call into the
> kernel-side runtime, if it cannot share variables with kernel-space
> probes?
No. The purpose of prototype was to see how it can be implemented.
To my opinion having handler run in user-space does not suit well for
system-wide tracing. But that might be one of the alternative approaches
to per-process tracing, since ptrace is found to have more performance
related problems.
Thanks
Prasanna
--
Thanks & Regards
Prasanna S Panchamukhi
Linux Technology Center
India Software Labs, IBM Bangalore
Email: prasanna@in.ibm.com
Ph: 91-80-51776329