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Re: proposed instruction trace support in SystemTap
- From: Dave Nomura <dcnltc at us dot ibm dot com>
- To: Roland McGrath <roland at redhat dot com>
- Cc: "Frank Ch. Eigler" <fche at redhat dot com>, systemtap at sourceware dot org, Maynard Johnson <mpjohn at us dot ibm dot com>, James Keniston <kenistoj at us dot ibm dot com>
- Date: Fri, 24 Aug 2007 13:59:44 -0700
- Subject: Re: proposed instruction trace support in SystemTap
- Organization: LTC Power Linux Toolchain
- References: <20070819204722.E3A9A4D058C@magilla.localdomain>
It appears that ptrace() wouldn't be able to deliver acceptable
performance for instruction tracing. Do you think that utrace would be
a reasonable alternative?
Roland McGrath wrote:
For user-mode stepping (all you can do via ptrace), this is what the utrace
in-kernel APIs give you.