Date: Fri, 22 Aug 2014 12:20:34 -0700 From: John-Mark Gurney <jmg@funkthat.com> To: Eric van Gyzen <eric@vangyzen.net> Cc: freebsd-current@freebsd.org Subject: Re: ktrace -c behavior Message-ID: <20140822192034.GA71691@funkthat.com> In-Reply-To: <53F79710.6090700@vangyzen.net> References: <53F79710.6090700@vangyzen.net>
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Eric van Gyzen wrote this message on Fri, Aug 22, 2014 at 15:16 -0400:
> What behavior would you expect from this sequence of commands?
>
> ktrace -tw -p 1234
> ktrace -c -p 1234
>
> Based on this...
>
> -c Clear the trace points associated with the specified file
> or processes.
and/or just add specified:
Clear the specified trace points ...
> ...I would expect the second command to clear the trace point for
> context switches. It doesn't. I have to specify -tw with the -c to get
> that behavior. This makes sense; it's just not what I was expecting.
>
> Assuming we want to keep this behavior, can we clarify the -c flag in
> man page? I would suggest:
>
> If the -t flag is not specified, clear the default set of trace points.
Maybe we should add a new trace point string that is a (for all).. so
you can do ktrace -ta -c?
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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