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Re: probes that access userspace

From: Kevin Stafford <kevinrs at us dot ibm dot com>
To: "Frank Ch. Eigler" <fche at redhat dot com>
Cc: systemtap at sources dot redhat dot com
Date: Fri, 14 Oct 2005 12:11:15 -0700
Subject: Re: probes that access userspace
References: <E55D.2090005__29732.3145241991$1129302467$gmane$org@us.ibm.com> <y0mzmpc2hkt.fsf@tooth.toronto.redhat.com>

Frank Ch. Eigler wrote:

[...] If this is not possible, I think it would be useful to enhance the language such that a probe script could explicitly notify the translator of a user space pointer access [...]
Perhaps.  Other than the system call interfaces, is this difficulty
likely to arise often elsewhere?
[...] For user-level probes, there is no ambiguity: every pointer dereference is in user space.

Being that for user-level probes, every pointer dereference is in user space, I believe it is certain that this difficulty will arise elsewhere.

--
Kevin Stafford
DES 2 | MS 2M3
Beaverton - OR
Linux Technology Center
IBM Systems & Technology
Phone: 1-503-578-3039
Email: kevinrs@us.ibm.com

Follow-Ups:
- Re: probes that access userspace
  - From: Frank Ch. Eigler

References:
- Re: probes that access userspace
  - From: Frank Ch. Eigler

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