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Re: proposed instruction trace support in SystemTap
- From: "Frank Ch. Eigler" <fche at redhat dot com>
- To: Dave Nomura <dcnltc at us dot ibm dot com>
- Cc: systemtap at sourceware dot org, Maynard Johnson <mpjohn at us dot ibm dot com>
- Date: Wed, 29 Aug 2007 12:04:37 -0400
- Subject: Re: proposed instruction trace support in SystemTap
- References: <20070819204722.E3A9A4D058C@magilla.localdomain> <46D590B7.3040808@us.ibm.com>
Hi -
On Wed, Aug 29, 2007 at 08:28:55AM -0700, Dave Nomura wrote:
> Would the performance of utrace be acceptable for doing instruction
> tracing?
Probably.
> It sounds like a lot of the signal overhead of ptrace is eliminated.
Yes.
> Would utrace only be useful for user-mode stepping,
Yes.
> or could it somehow handle the in-kernel case?
No.
- FChE