linux-kernel - Re: [RFC][BUG] tracer: Fails to work

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Message-ID: <20160128152957.GU6356@twins.programming.kicks-ass.net>
Date:	Thu, 28 Jan 2016 16:29:57 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC][BUG] tracer: Fails to work

On Thu, Jan 28, 2016 at 02:53:53PM +0000, Mathieu Desnoyers wrote:
> On x86, many BIOS wipe the memory content even after a warm reset :(
> The most reliable solution I found on x86 is to use kexec() to
> boot into a new kernel, mount the DAX filesystem again and read the
> buffers from there.

kexec() is tricky when the kernel is still prefectly fine, I doubt it'll
work when I've hosed it properly :/