From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
To: jerry.hoemann-VXdhtT5mjnY@public.gmane.org
Cc: rob-VoJi6FS/r0vR7s880joybQ@public.gmane.org,
tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org,
mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
yinghai-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
penberg-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 0/3] Early use of boot service memory
Date: Wed, 13 Nov 2013 14:49:42 -0800 [thread overview]
Message-ID: <52840206.5020006@zytor.com> (raw)
In-Reply-To: <20131113224503.GB25344-dMAi7lA+vBPDUbYHzcRnttBPR1lH4CV8@public.gmane.org>
On 11/13/2013 02:45 PM, jerry.hoemann-VXdhtT5mjnY@public.gmane.org wrote:
>
> The changes in 3.9 to allow crash kernel to be allocated high helps.
> But as you say, the default is still to allocate crash kernel low and
> still susceptible to this problem. So, a kdump expert can work around it.
> But, not everyone is a kdump expert.
>
> So, we can work to change the default, or encourage the distros
> to always allocate high. Or, we change the call to efi_reserve_boot_services
> not apply to all platforms.
>
> The problems for pre 3.9 based distros is worse as they don't have
> ability to allocate crash kernel high.
>
But they won't have your new option, either, and that is still horribly
manual and system-dependent.
In other words, allocating the crashkernel high has ALL the advantages,
plus a few more, and NONE of the disadvantages.
-hpa
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: jerry.hoemann@hp.com
Cc: rob@landley.net, tglx@linutronix.de, mingo@redhat.com,
x86@kernel.org, matt.fleming@intel.com, yinghai@kernel.org,
penberg@kernel.org, akpm@linux-foundation.org,
linux-doc@vger.kernel.org, linux-efi@vger.kernel.org,
vgoyal@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3] Early use of boot service memory
Date: Wed, 13 Nov 2013 14:49:42 -0800 [thread overview]
Message-ID: <52840206.5020006@zytor.com> (raw)
In-Reply-To: <20131113224503.GB25344@anatevka.fc.hp.com>
On 11/13/2013 02:45 PM, jerry.hoemann@hp.com wrote:
>
> The changes in 3.9 to allow crash kernel to be allocated high helps.
> But as you say, the default is still to allocate crash kernel low and
> still susceptible to this problem. So, a kdump expert can work around it.
> But, not everyone is a kdump expert.
>
> So, we can work to change the default, or encourage the distros
> to always allocate high. Or, we change the call to efi_reserve_boot_services
> not apply to all platforms.
>
> The problems for pre 3.9 based distros is worse as they don't have
> ability to allocate crash kernel high.
>
But they won't have your new option, either, and that is still horribly
manual and system-dependent.
In other words, allocating the crashkernel high has ALL the advantages,
plus a few more, and NONE of the disadvantages.
-hpa
next prev parent reply other threads:[~2013-11-13 22:49 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-12 2:15 [PATCH 0/3] Early use of boot service memory Jerry Hoemann
[not found] ` <1384222558-38527-1-git-send-email-jerry.hoemann-VXdhtT5mjnY@public.gmane.org>
2013-11-12 2:15 ` [PATCH 1/3] efi: " Jerry Hoemann
2013-11-12 2:15 ` Jerry Hoemann
2013-11-12 2:15 ` [PATCH 3/3] x86, " Jerry Hoemann
2013-11-12 2:15 ` Jerry Hoemann
2013-11-12 18:58 ` [PATCH 0/3] " H. Peter Anvin
2013-11-12 18:58 ` H. Peter Anvin
[not found] ` <d73ccce9-6a0d-4470-bda3-f0c6eb96b5e4-2ueSQiBKiTY7tOexoI0I+QC/G2K4zDHf@public.gmane.org>
2013-11-13 22:45 ` jerry.hoemann-VXdhtT5mjnY
2013-11-13 22:45 ` jerry.hoemann
[not found] ` <20131113224503.GB25344-dMAi7lA+vBPDUbYHzcRnttBPR1lH4CV8@public.gmane.org>
2013-11-13 22:49 ` H. Peter Anvin [this message]
2013-11-13 22:49 ` H. Peter Anvin
[not found] ` <52840206.5020006-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-11-13 23:57 ` jerry.hoemann-VXdhtT5mjnY
2013-11-13 23:57 ` jerry.hoemann
2013-11-14 0:05 ` H. Peter Anvin
2013-11-14 1:40 ` jerry.hoemann
[not found] ` <528413DE.1090203-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2014-08-01 9:54 ` Yuhong Bao
2014-08-01 9:54 ` Yuhong Bao
[not found] ` <20131113235708.GC25344-dMAi7lA+vBPDUbYHzcRnttBPR1lH4CV8@public.gmane.org>
2013-11-14 8:24 ` Pekka Enberg
2013-11-14 8:24 ` Pekka Enberg
2013-11-14 18:04 ` jerry.hoemann
[not found] ` <20131114180455.GA32212-dMAi7lA+vBPDUbYHzcRnttBPR1lH4CV8@public.gmane.org>
2013-11-14 18:44 ` Pekka Enberg
2013-11-14 18:44 ` Pekka Enberg
2013-11-14 18:45 ` H. Peter Anvin
2013-11-14 18:45 ` H. Peter Anvin
2013-11-15 0:50 ` jerry.hoemann
[not found] ` <20131115005049.GJ5116-dMAi7lA+vBPDUbYHzcRnttBPR1lH4CV8@public.gmane.org>
2013-11-15 6:24 ` Ingo Molnar
2013-11-15 6:24 ` Ingo Molnar
2013-11-15 6:55 ` Yinghai Lu
2013-11-15 6:59 ` H. Peter Anvin
2013-11-15 6:59 ` H. Peter Anvin
2013-11-15 14:07 ` Vivek Goyal
2013-11-15 14:07 ` Vivek Goyal
2013-11-15 17:33 ` Yinghai Lu
2013-11-15 17:33 ` Yinghai Lu
2013-11-15 17:40 ` H. Peter Anvin
2013-11-15 17:40 ` H. Peter Anvin
2013-11-15 18:30 ` Vivek Goyal
2013-11-15 18:30 ` Vivek Goyal
2013-11-15 18:46 ` H. Peter Anvin
2013-11-15 18:46 ` H. Peter Anvin
2013-11-15 19:16 ` H. Peter Anvin
2013-11-15 19:16 ` H. Peter Anvin
2013-11-18 15:22 ` Vivek Goyal
2013-11-18 15:22 ` Vivek Goyal
2013-11-18 18:29 ` H. Peter Anvin
2013-11-18 18:29 ` H. Peter Anvin
2013-11-18 18:52 ` Vivek Goyal
2013-11-18 18:52 ` Vivek Goyal
2013-11-19 1:32 ` H. Peter Anvin
2013-11-19 1:32 ` H. Peter Anvin
[not found] ` <528ABFA3.6060905-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-11-19 3:02 ` Yinghai Lu
2013-11-19 3:02 ` Yinghai Lu
2013-11-19 3:02 ` Yinghai Lu
2013-11-15 18:03 ` Vivek Goyal
2013-11-15 18:03 ` Vivek Goyal
2013-11-15 22:24 ` Yinghai Lu
2013-11-15 22:24 ` Yinghai Lu
[not found] ` <CAE9FiQU_OstEq3VWwBB879O4EY0DE+zVWVens+w0MLFUQmr3sw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-11-15 22:55 ` jerry.hoemann-VXdhtT5mjnY
2013-11-15 22:55 ` jerry.hoemann
2013-11-15 22:55 ` jerry.hoemann
2013-11-15 23:43 ` Yinghai Lu
2013-11-15 23:43 ` Yinghai Lu
2013-11-18 15:32 ` Vivek Goyal
2013-11-18 15:32 ` Vivek Goyal
2013-11-18 19:34 ` Yinghai Lu
2013-11-18 19:34 ` Yinghai Lu
2013-11-18 19:39 ` Vivek Goyal
2013-11-18 19:39 ` Vivek Goyal
2013-11-15 18:16 ` jerry.hoemann
2013-11-15 18:16 ` jerry.hoemann
2013-11-15 19:13 ` jerry.hoemann
2013-11-18 15:42 ` Vivek Goyal
2013-11-15 8:36 ` Pekka Enberg
2013-11-15 8:36 ` Pekka Enberg
2013-11-15 8:36 ` Pekka Enberg
2013-11-14 15:26 ` Vivek Goyal
2013-11-14 15:26 ` Vivek Goyal
2013-11-12 2:15 ` [PATCH 2/3] x86: avoid efi_reserve_boot_services Jerry Hoemann
2013-11-12 10:37 ` [PATCH 0/3] Early use of boot service memory Pekka Enberg
2013-11-12 17:55 ` jerry.hoemann
2013-11-12 18:48 ` Pekka Enberg
[not found] ` <CAOJsxLEU1SPd=1C8QPgrZGWeOuyOVkozuMR014xBpJTxyFviKA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-11-12 21:52 ` jerry.hoemann-VXdhtT5mjnY
2013-11-12 21:52 ` jerry.hoemann
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