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Re: [RFC 0/3] Kprobes: support for userspace probes
- From: James Dickens <jamesd dot wi at gmail dot com>
- To: prasanna at in dot ibm dot com
- Cc: systemtap at sources dot redhat dot com
- Date: Wed, 14 Sep 2005 13:14:15 -0500
- Subject: Re: [RFC 0/3] Kprobes: support for userspace probes
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- References: <20050914063035.GA15955@in.ibm.com>
- Reply-to: jamesd dot wi at gmail dot com
On 9/14/05, Prasanna S Panchamukhi <prasanna@in.ibm.com> wrote:
> Hi All,
>
> Please find the details of the userspace probes below.
> Also I have tried to implement the same to demonistrate
> this design, in 3 patches for linux kernel version 2.6.13.
>
> 1. Provides interface to insert probes when pages are in memory.
> 2. Adds a feature to insert probes on pages not present in the memory.
in the case where you probe a userland app, and its swapped out, then
memory pressure gets worse, and the code segment is discarded, thus
will be reloaded from disk next time. do you have a hook to tell the
monitoring software than they are no longer being probed? or do you
have a machanism that protects a block with probes in it from being
discarded?
James Dickens
>
> Prasanna S Panchamukhi
> Linux Technology Center
> India Software Labs, IBM Bangalore
> Ph: 91-80-25044636
> <prasanna@in.ibm.com>
>