[Review] Remove procfs dependency of truss

Alfred Perlstein alfred at freebsd.org
Wed Apr 4 17:18:01 UTC 2007

* Howard Su <howard0su at gmail.com> [070404 04:35] wrote:
> On 4/4/07, Alfred Perlstein <alfred at freebsd.org> wrote:
> >* Howard Su <howard0su at gmail.com> [070404 01:20] wrote:
> >> Following the suggestion in idea page, I proposed the attached patch.
> >> I didn't change any kernel part because I think PTRACE(2) is
> >> functional although man page didn't document it.
> >>
> >> I tested the patch under i386 and amd64 box. The help on testing and
> >> code review will be appreciated.
> >
> >wow, well done!  any draw backs to using ptrace over procfs?
> I didn't see.
> >
> >have you tested performance?
> Not yet. Base on the number of kernel syscall, new implementaion keep
> in a same level. However ptrace calls has a short code path compare to
> generic read syscall. I suppose there will be some improvement.
> Anyway, I will try to get perf data.

Thank you very much for the work, perhaps if the performance is slower
we can make it a runtime option?

Regardless, very well done, it's nice not to have this depend on
procfs any longer!

- Alfred Perlstein

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