From: Andi Kleen <andi@firstfloor.org>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: "K.Prasad" <prasad@linux.vnet.ibm.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>,
"Luck, Tony" <tony.luck@intel.com>,
kexec@lists.infradead.org,
"Eric W. Biederman" <ebiederm@xmission.com>,
anderson@redhat.com
Subject: Re: [RFC Patch 5/6] slimdump: Capture slimdump for fatal MCE generated crashes
Date: Thu, 26 May 2011 20:09:31 +0200 [thread overview]
Message-ID: <20110526180931.GF4065@one.firstfloor.org> (raw)
In-Reply-To: <20110526174447.GC29496@redhat.com>
On Thu, May 26, 2011 at 01:44:47PM -0400, Vivek Goyal wrote:
> On Thu, May 26, 2011 at 10:53:05PM +0530, K.Prasad wrote:
> >
> > slimdump: Capture slimdump for fatal MCE generated crashes
> >
> > System crashes resulting from fatal hardware errors (such as MCE) don't need
> > all the contents from crashing-kernel's memory. Generate a new 'slimdump' that
> > retains only essential information while discarding the old memory.
> >
>
> Why to enforce zeroing out of rest of the vmcore data in kernel. Why not
> leave it to user space.
I think it's a good default to not do a full dump on MCE.
It's very unlikely to be useful for anything, and will just waste
reboot time (aka nines).
That said including the dmesg too may be a good idea.
On the other hand I think the slim dump should be probably generalized
and used for more situations. I could well imagine enabling it by
default on various systems.
-Andi
WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <andi@firstfloor.org>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: "Luck, Tony" <tony.luck@intel.com>,
kexec@lists.infradead.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>,
anderson@redhat.com, "Eric W. Biederman" <ebiederm@xmission.com>,
"K.Prasad" <prasad@linux.vnet.ibm.com>
Subject: Re: [RFC Patch 5/6] slimdump: Capture slimdump for fatal MCE generated crashes
Date: Thu, 26 May 2011 20:09:31 +0200 [thread overview]
Message-ID: <20110526180931.GF4065@one.firstfloor.org> (raw)
In-Reply-To: <20110526174447.GC29496@redhat.com>
On Thu, May 26, 2011 at 01:44:47PM -0400, Vivek Goyal wrote:
> On Thu, May 26, 2011 at 10:53:05PM +0530, K.Prasad wrote:
> >
> > slimdump: Capture slimdump for fatal MCE generated crashes
> >
> > System crashes resulting from fatal hardware errors (such as MCE) don't need
> > all the contents from crashing-kernel's memory. Generate a new 'slimdump' that
> > retains only essential information while discarding the old memory.
> >
>
> Why to enforce zeroing out of rest of the vmcore data in kernel. Why not
> leave it to user space.
I think it's a good default to not do a full dump on MCE.
It's very unlikely to be useful for anything, and will just waste
reboot time (aka nines).
That said including the dmesg too may be a good idea.
On the other hand I think the slim dump should be probably generalized
and used for more situations. I could well imagine enabling it by
default on various systems.
-Andi
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next prev parent reply other threads:[~2011-05-26 18:09 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-26 17:07 [RFC Patch 0/6] slimdump: Enable slimdump if crashing kernel memory is not required K.Prasad
2011-05-26 17:07 ` K.Prasad
2011-05-26 17:12 ` [Patch 1/6] XPANIC: Add extended panic interface K.Prasad
2011-05-26 17:12 ` K.Prasad
2011-05-26 17:38 ` richard -rw- weinberger
2011-05-26 17:38 ` richard -rw- weinberger
2011-05-27 15:56 ` K.Prasad
2011-05-27 15:56 ` K.Prasad
2011-05-27 17:59 ` Eric W. Biederman
2011-05-27 17:59 ` Eric W. Biederman
2011-05-26 17:12 ` [Patch 2/6] x86: mce: Convert mce code to xpanic K.Prasad
2011-05-26 17:12 ` K.Prasad
2011-05-27 18:01 ` Eric W. Biederman
2011-05-27 18:01 ` Eric W. Biederman
2011-05-26 17:14 ` [Bugfix][Patch 3/3] Invoke vpanic inside xpanic function K.Prasad
2011-05-26 17:14 ` K.Prasad
2011-05-26 17:15 ` [RFC Patch 4/6] PANIC_MCE: Introduce a new panic flag for fatal MCE, capture related information K.Prasad
2011-05-26 17:15 ` K.Prasad
2011-05-26 18:43 ` Vivek Goyal
2011-05-26 18:43 ` Vivek Goyal
2011-05-27 17:03 ` K.Prasad
2011-05-27 17:03 ` K.Prasad
2011-05-27 18:29 ` Vivek Goyal
2011-05-27 18:29 ` Vivek Goyal
2011-05-27 18:04 ` Eric W. Biederman
2011-05-27 18:04 ` Eric W. Biederman
2011-05-31 17:40 ` K.Prasad
2011-05-31 17:40 ` K.Prasad
2011-06-01 17:18 ` Dave Anderson
2011-06-01 17:18 ` Dave Anderson
2011-06-01 17:23 ` Vivek Goyal
2011-06-01 17:23 ` Vivek Goyal
2011-06-01 17:41 ` Dave Anderson
2011-06-01 17:41 ` Dave Anderson
2011-06-08 17:16 ` K.Prasad
2011-06-08 17:16 ` K.Prasad
2011-06-12 15:44 ` Eric W. Biederman
2011-06-12 15:44 ` Eric W. Biederman
2011-06-15 2:06 ` K.Prasad
2011-06-15 2:06 ` K.Prasad
2011-05-27 18:09 ` Eric W. Biederman
2011-05-27 18:09 ` Eric W. Biederman
2011-05-26 17:23 ` [RFC Patch 5/6] slimdump: Capture slimdump for fatal MCE generated crashes K.Prasad
2011-05-26 17:23 ` K.Prasad
2011-05-26 17:32 ` Andi Kleen
2011-05-26 17:32 ` Andi Kleen
2011-05-27 15:53 ` K.Prasad
2011-05-27 15:53 ` K.Prasad
2011-05-26 17:44 ` Vivek Goyal
2011-05-26 17:44 ` Vivek Goyal
2011-05-26 18:09 ` Andi Kleen [this message]
2011-05-26 18:09 ` Andi Kleen
2011-05-26 18:26 ` Vivek Goyal
2011-05-26 18:26 ` Vivek Goyal
2011-05-26 18:58 ` Andi Kleen
2011-05-26 18:58 ` Andi Kleen
2011-05-26 19:10 ` Vivek Goyal
2011-05-26 19:10 ` Vivek Goyal
2011-05-26 23:44 ` Simon Horman
2011-05-26 23:44 ` Simon Horman
2011-05-27 16:57 ` K.Prasad
2011-05-27 16:57 ` K.Prasad
2011-05-27 17:59 ` Vivek Goyal
2011-05-27 17:59 ` Vivek Goyal
2011-06-08 17:00 ` K.Prasad
2011-06-08 17:00 ` K.Prasad
2011-05-27 18:14 ` Eric W. Biederman
2011-05-27 18:14 ` Eric W. Biederman
2011-05-26 17:26 ` [RFC Patch 6/6] Crash: Recognise slim coredumps and process new elf-note sections K.Prasad
2011-05-26 17:26 ` K.Prasad
2011-05-27 15:37 ` Mahesh J Salgaonkar
2011-05-27 15:37 ` Mahesh J Salgaonkar
2011-05-27 18:16 ` Eric W. Biederman
2011-05-27 18:16 ` Eric W. Biederman
2011-05-27 18:22 ` Vivek Goyal
2011-05-27 18:22 ` Vivek Goyal
2011-05-27 18:35 ` Eric W. Biederman
2011-05-27 18:35 ` Eric W. Biederman
2011-05-26 17:31 ` [RFC Patch 0/6] slimdump: Enable slimdump if crashing kernel memory is not required K.Prasad
2011-05-26 17:31 ` K.Prasad
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