From: "H. Peter Anvin" <hpa@zytor.com>
To: Vivek Goyal <vgoyal@redhat.com>,
HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: fengguang.wu@intel.com, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, bp@alien8.de,
ebiederm@xmission.com, akpm@linux-foundation.org,
hpa@linux.intel.com, jingbai.ma@hp.com
Subject: Re: [RESEND PATCH v10] x86, apic, kexec, Documentation: Add disable_cpu_apicid kernel parameter
Date: Wed, 15 Jan 2014 09:26:14 -0800 [thread overview]
Message-ID: <52D6C4B6.8010804@zytor.com> (raw)
In-Reply-To: <20140115170525.GF3180@redhat.com>
On 01/15/2014 09:05 AM, Vivek Goyal wrote:
>
> I think this is a reasonable approach to solve the issue. Use a command
> line to not bring up specific cpu in second kernel which can create
> problems.
>
> Acked-by: Vivek Goyal <vgoyal@redhat.com>
>
> hpa, I know you are not excited about this approach. If you made up your
> mind that this appoarch is not worth pursuing, please do suggest what
> would you like to see and we can give that a try.
>
> We want to solve this problem as on large memory machines saving dump can
> take lot of time and we want to bring up multiple cpus and speed up
> compression and save on dump time.
>
I'm not excited about kdump's reliance on the command line, since it
seems to be a neverending source of trouble, simply because the command
line is fundamentally intended as a human interface. However, this
seems relatively harmless in comparison with everything else and I am
much happier with saving the ID in the first kernel rather than trying
to guess if a currently-downed CPU is the BSP.
-hpa
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http://lists.infradead.org/mailman/listinfo/kexec
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Vivek Goyal <vgoyal@redhat.com>,
HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: hpa@linux.intel.com, jingbai.ma@hp.com,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
bp@alien8.de, ebiederm@xmission.com, akpm@linux-foundation.org,
fengguang.wu@intel.com
Subject: Re: [RESEND PATCH v10] x86, apic, kexec, Documentation: Add disable_cpu_apicid kernel parameter
Date: Wed, 15 Jan 2014 09:26:14 -0800 [thread overview]
Message-ID: <52D6C4B6.8010804@zytor.com> (raw)
In-Reply-To: <20140115170525.GF3180@redhat.com>
On 01/15/2014 09:05 AM, Vivek Goyal wrote:
>
> I think this is a reasonable approach to solve the issue. Use a command
> line to not bring up specific cpu in second kernel which can create
> problems.
>
> Acked-by: Vivek Goyal <vgoyal@redhat.com>
>
> hpa, I know you are not excited about this approach. If you made up your
> mind that this appoarch is not worth pursuing, please do suggest what
> would you like to see and we can give that a try.
>
> We want to solve this problem as on large memory machines saving dump can
> take lot of time and we want to bring up multiple cpus and speed up
> compression and save on dump time.
>
I'm not excited about kdump's reliance on the command line, since it
seems to be a neverending source of trouble, simply because the command
line is fundamentally intended as a human interface. However, this
seems relatively harmless in comparison with everything else and I am
much happier with saving the ID in the first kernel rather than trying
to guess if a currently-downed CPU is the BSP.
-hpa
next prev parent reply other threads:[~2014-01-15 17:27 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-15 6:44 [RESEND PATCH v10] x86, apic, kexec, Documentation: Add disable_cpu_apicid kernel parameter HATAYAMA Daisuke
2014-01-15 6:44 ` HATAYAMA Daisuke
2014-01-15 17:05 ` Vivek Goyal
2014-01-15 17:05 ` Vivek Goyal
2014-01-15 17:26 ` H. Peter Anvin [this message]
2014-01-15 17:26 ` H. Peter Anvin
2014-01-15 17:47 ` Vivek Goyal
2014-01-15 17:47 ` Vivek Goyal
2014-01-15 17:54 ` H. Peter Anvin
2014-01-15 17:54 ` H. Peter Anvin
2014-01-15 18:14 ` Vivek Goyal
2014-01-15 18:14 ` Vivek Goyal
2014-01-15 18:20 ` H. Peter Anvin
2014-01-15 18:20 ` H. Peter Anvin
2014-02-10 17:28 ` Petr Tesarik
2014-02-10 17:28 ` Petr Tesarik
2014-01-15 17:57 ` [tip:x86/apic] x86, apic, kexec: " tip-bot for HATAYAMA Daisuke
2014-01-15 18:25 ` Ingo Molnar
2014-01-15 21:09 ` [tip:x86/apic] x86, apic: Make disabled_cpu_apicid static read_mostly, fix typos tip-bot for H. Peter Anvin
2014-01-16 4:44 ` HATAYAMA Daisuke
2014-01-16 5:53 ` H. Peter Anvin
2014-01-16 6:20 ` HATAYAMA Daisuke
2014-01-16 6:24 ` H. Peter Anvin
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