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Re: [...] kprobes [minutes] portion 20060406
- From: Richard J Moore <richardj_moore at uk dot ibm dot com>
- To: prasanna at in dot ibm dot com
- Cc: "Frank Ch. Eigler" <fche at redhat dot com>, Hien Q Nguyen <nguyhien at us dot ibm dot com>, systemtap at sources dot redhat dot com
- Date: Fri, 7 Apr 2006 09:43:05 +0100
- Subject: Re: [...] kprobes [minutes] portion 20060406
- Sensitivity:
systemtap-owner@sourceware.org wrote on 07/04/2006 09:25:17:
>
> 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.
>
>
Agreed, but don't let the creation of per-process probe handlers detract
from the argument for a system-wide capabiltiy; that's the real
battle-ground.
Richard
> Thanks
> Prasanna
> --
> Thanks & Regards
> Prasanna S Panchamukhi
> Linux Technology Center
> India Software Labs, IBM Bangalore
> Email: prasanna@in.ibm.com
> Ph: 91-80-51776329