linux-kernel - Re: [PATCH 0/2] Allow crash dumps with crash_kexec_post_notifiers

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Message-ID: <20160713142724.18f2f638@hananiah.suse.cz>
Date:	Wed, 13 Jul 2016 14:27:24 +0200
From:	Petr Tesarik <ptesarik@...e.cz>
To:	Juergen Gross <jgross@...e.com>,
	Josh Triplett <josh@...htriplett.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Eric Biederman <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Dave Young <dyoung@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Vrabel <david.vrabel@...rix.com>
Cc:	"moderated list:XEN HYPERVISOR INTERFACE" 
	<xen-devel@...ts.xenproject.org>,
	"maintainer:X86 ARCHITECTURE 32-BIT AND 64-BIT" <x86@...nel.org>,
	"open list:KEXEC" <kexec@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] Allow crash dumps with crash_kexec_post_notifiers

On Wed, 13 Jul 2016 14:19:50 +0200
Petr Tesarik <ptesarik@...e.com> wrote:

> Hello all,
> 
> this patch series makes it possible to save a kernel crash dump when the
> kernel command line includes "crash_kexec_post_notifiers".

Oh ... I forgot to add: This only applies to running Linux under Xen.
If you run on bare metal, you can always save the dump already, as you
certainly know.

Petr T

> There might
> be other approaches, but mine has the advantage that no new sysctl is
> required, and the behaviour is the same whether panic notifiers are run
> or not: If you load a crash kernel with kexec, it will be used, otherwise
> the hypervisor facility is used (using a hypercall).
> 
> Feedback welcome!
> 
> Petr T
> 
> ---
> 
> Petr Tesarik (2):
>       Add a kexec_crash_loaded() function
>       Allow kdump with crash_kexec_post_notifiers
> 
> 
>  arch/x86/xen/enlighten.c |    3 ++-
>  include/linux/kexec.h    |    2 ++
>  kernel/kexec_core.c      |    5 +++++
>  kernel/ksysfs.c          |    2 +-
>  4 files changed, 10 insertions(+), 2 deletions(-)
> 
> --
> Signature
> 
> _______________________________________________
> kexec mailing list
> kexec@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec

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