linux-kernel - Re: [PATCH] x86/dumpstack: Walk frames when built with frame pointers

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Date:	Fri, 6 Jun 2014 10:24:20 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Richard Yao <ryao@...too.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Vineet Gupta <vgupta@...opsys.com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	kernel@...too.org, Brian Behlendorf <behlendorf1@...l.gov>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH] x86/dumpstack: Walk frames when built with frame pointers

On Fri, Jun 06, 2014 at 10:17:26AM +0200, Peter Zijlstra wrote:
> Hopefully the EFI pstore thing will work out, but I've already heard
> that can wear out very quickly and render your machine a brick :-(

And not only that - write speed is awfully low. I hear you might be ok
to record an oops or so. Continuous debug output, not so much.

> Me, I simply refuse to work on machines if they don't have a serial
> line, but in general that's not a tenable position I suppose :/

Well, with all the other crap they put in modern machines, how hard it
is to put a goddam stupid serial line out everywhere...? WTF do I need a
goddam adaptive keyboard and other idiotic bling-bling if I can't have a
simple serial line for debugging... Blergh.
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