linux-kernel - Re: [PATCH] [RFCv3] perf: robustify proc and debugfs file recording

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Date:	Thu, 14 Jul 2011 14:55:30 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Michael Neuling <mikey@...ling.org>,
	Sonny Rao <sonnyrao@...omium.org>, acme@...hat.com,
	anton@...ba.org, Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFCv3] perf: robustify proc and debugfs file recording

On Thu, 2011-07-14 at 08:45 -0400, Steven Rostedt wrote:
> ---
>  tools/perf/util/trace-event-info.c |  120 ++++++++------------------------=
> -----
>  1 file changed, 29 insertions(+), 91 deletions(-)
> 
> Index: linux-ozlabs/tools/perf/util/trace-event-info.c
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- linux-ozlabs.orig/tools/perf/util/trace-event-info.c        2011-07-13 20:42:2=
> 4.442945973 +1000
> +++ linux-ozlabs/tools/perf/util/trace-event-info.c     2011-07-14 10:14:19.072=
> 946058 +1000
> @@ -183,106 +183,59 @@
>         return *ptr =3D=3D 0x01020304;
>  }
> =20
> -static unsigned long long copy_file_fd(int fd)
> +/* unfortunately, you can not stat debugfs or proc files for size */
> +static void record_file(const char *file, size_t hdr_sz)
>  {
>         unsigned long long size =3D 0;

Yeah, its all the rage, we're supposed to write full RFC compliant email
parsers these days :(

/Content-Transfer-Encoding:.*quoted-printable.*/ {
        decode = 1;
}

// {
	tmp = $0

	if (!decode) {
		print tmp
		next
	}

	if (concat) {
                tmp = last tmp
                concat = 0;
        }

        if (tmp ~ /=$/) {
                concat = 1;
                gsub("=$", "", tmp);
        }

        offset = 0;
        while (match(tmp, /=[[:xdigit:]][[:xdigit:]]/, a)) {
                if (a[0] < offset)
                        break;
                hex = substr(a[0], 2)
                char = sprintf("%c", strtonum("0x"hex))
                gsub(a[0], char, tmp)
                offset = a[0];
        }

        if (concat) {
                last = tmp
                next
        }

        print tmp
}


Should decode that crap I think..
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