Date: Thu, 21 Nov 2002 10:40:56 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Harti Brandt <brandt@fokus.gmd.de> Cc: hackers@FreeBSD.ORG Subject: Re: kernel basic block profiling Message-ID: <1012.1037871656@critter.freebsd.dk> In-Reply-To: Your message of "Thu, 21 Nov 2002 09:38:56 %2B0100." <20021121093752.A36443-100000@beagle.fokus.gmd.de>
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In message <20021121093752.A36443-100000@beagle.fokus.gmd.de>, Harti Brandt wri
tes:
>${subject} seems not to work on -current. First of all 'man kernbb' tells
>me to compile at least one kernel file with '-a'. Well, gcc tells me that
>it doesn't know anything about '-a'. After some grepping in the gcc
>sources I came to the conclusion, that -fprofile-arcs is what it wants.
>But even then 'kernbb' gives me nothing on the new kernel and gdb shows
>bbhead to contain a 0. As far as I could figure out, the profile-arcs uses
>a ctor section and I somehow doubt, that this works in the kernel case.
>
>So, is ${subject} usable on current or is it just a stale feature?
I havn't checked it lately, but it should be brought to work again
I think, it is a very valuable provider of insight into what code
is really executed.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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