Re: [PATCH 1/3] panic: Disable crash_kexec_post_notifiers if kdump is not available

From	dwalker@fifo99.com
Newsgroups	linux.kernel
Subject	Re: [PATCH 1/3] panic: Disable crash_kexec_post_notifiers if kdump is not available
Date	2015-07-14 17:40 +0200
Message-ID	<pMatj-4pB-27@gated-at.bofh.it> (permalink)
References	(2 earlier) <pKGQH-6Gh-31@gated-at.bofh.it> <pLSwp-1mN-13@gated-at.bofh.it> <pLXcK-4ev-7@gated-at.bofh.it> <pM8Uy-2QN-15@gated-at.bofh.it> <pMa0i-3Rk-25@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Tue, Jul 14, 2015 at 11:02:08AM -0400, Vivek Goyal wrote:
> On Tue, Jul 14, 2015 at 01:59:19PM +0000, dwalker@fifo99.com wrote:
> > On Mon, Jul 13, 2015 at 08:19:45PM -0500, Eric W. Biederman wrote:
> > > dwalker@fifo99.com writes:
> > > 
> > > > On Fri, Jul 10, 2015 at 08:41:28AM -0500, Eric W. Biederman wrote:
> > > >> Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> writes:
> > > >> 
> > > >> > You can call panic notifiers and kmsg dumpers before kdump by
> > > >> > specifying "crash_kexec_post_notifiers" as a boot parameter.
> > > >> > However, it doesn't make sense if kdump is not available.  In that
> > > >> > case, disable "crash_kexec_post_notifiers" boot parameter so that
> > > >> > you can't change the value of the parameter.
> > > >> 
> > > >> Nacked-by: "Eric W. Biederman" <ebiederm@xmission.com>
> > > >
> > > > I think it would make sense if he just replaced "kdump" with "kexec".
> > > 
> > > It would be less insane, however it still makes no sense as without
> > > kexec on panic support crash_kexec is a noop.  So the value of the
> > > seeting makes no difference.
> > 
> > Can you explain more, I don't really understand what you mean. Are you suggesting
> > the whole "crash_kexec_post_notifiers" feature has no value ?
> 
> Daniel,
> 
> BTW, why are you using crash_kexec_post_notifiers commandline? Why not
> without it?

It was explained in the prior thread but to rehash, the notifiers are used to do a switch
over from the crashed machine to another redundant machine.

Daniel
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Thread

Re: [PATCH 1/3] panic: Disable crash_kexec_post_notifiers if kdump  is not available Vivek Goyal <vgoyal@redhat.com> - 2015-07-14 17:10 +0200
  Re: [PATCH 1/3] panic: Disable crash_kexec_post_notifiers if kdump  is not available dwalker@fifo99.com - 2015-07-14 17:40 +0200
    Re: [PATCH 1/3] panic: Disable crash_kexec_post_notifiers if kdump  is not available dwalker@fifo99.com - 2015-07-14 17:50 +0200
      Re: [PATCH 1/3] panic: Disable crash_kexec_post_notifiers if kdump  is not available Vivek Goyal <vgoyal@redhat.com> - 2015-07-14 18:20 +0200
    Re: [PATCH 1/3] panic: Disable crash_kexec_post_notifiers if kdump  is not available Vivek Goyal <vgoyal@redhat.com> - 2015-07-14 17:50 +0200
      Re: [PATCH 1/3] panic: Disable crash_kexec_post_notifiers if kdump  is not available Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> - 2015-07-15 12:50 +0200

csiph-web