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Re: kdb and optimizations

From: Samuel Thibault
Subject: Re: kdb and optimizations
Date: Mon, 8 Apr 2013 00:13:16 +0200
User-agent: Mutt/1.5.21+34 (58baf7c9f32f) (2010-12-30)

Thomas Schwinge, le Mon 08 Apr 2013 00:06:23 +0200, a écrit :
> On Sun, 7 Apr 2013 21:10:09 +0200, Samuel Thibault <samuel.thibault@gnu.org> 
> wrote:
> > In the Debian package, when building the kdb-enabled kernel,
> > we pass -fno-omit-frame-pointer in CFLAGS, and I'll push
> > -fno-optimize-sibling-calls too. Both of them permit to get useful call
> > traces in kdb. They should rather be included in the upstream
> > configfrag.ac, don't they?
> With KDB not handling DWARF information, what you propose is probably the
> "right" thing to do indeed, depite the performance loss (which I don't
> know how big it is).

It's probably negligible: it's only about replacing call with jmp.


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