netdev - Re: [Xen-devel] Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable

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Date:	Tue, 20 Mar 2007 22:49:45 +0100
From:	Andi Kleen <ak@...e.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Andi Kleen <ak@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	jeremy@...p.org, xen-devel@...ts.xensource.com,
	netdev@...r.kernel.org, mingo@...e.hu, jbeulich@...ell.com,
	virtualization@...ts.linux-foundation.org, chrisw@...s-sol.org,
	virtualization@...ts.osdl.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>, anthony@...emonkey.ws,
	akpm@...ux-foundation.org, David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable

On Tue, Mar 20, 2007 at 09:39:18PM +0000, Alan Cox wrote:
> > > Because that's really the issue: do you want a "pretty" backtrace, or do 
> > > you want one that is rock solid but has some crud in it.
> > 
> > I just want an as exact backtrace as possible. I also think
> > that we can make the unwinder robust enough.
> 
> Any reason you can't put the exact back trace in "[xxx]" and the ones we
> see on the stack which dont look like call trace as ?xxx? It makes the
> code a bit trickier but we depend on the quality of traces

Linus is worried about the unwinder crashing -- that wouldn't help with that.

What the (now out of tree) unwinder does is to check if it finishes
the trace and if not fall back to the old unwinder.

-Andi
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