On Wed, Oct 23, 2013 at 12:01:18AM +0900, HATAYAMA Daisuke wrote:
> This patch set is to allow kdump 2nd kernel to wake up multiple CPUs
> even if 1st kernel crashs on some AP, a continueing work from:
>
> [PATCH v3 0/2] x86, apic, kdump: Disable BSP if boot cpu is AP
> https://lkml.org/lkml/2013/10/16/300.
>
> In this version, basic design has changed. Now users need to figure
> out initial APIC ID of BSP in the 1st kernel and configures kernel
> parameter for the 2nd kernel manually using disable_cpu_apic kernel
> parameter to be newly introduced in this patch set. This design is
> more flexible than the previous version in that we no longer have to
> rely on ACPI/MP table to get initial APIC ID of BSP.
>
> Sorry, this patch set have not include in-source documentation
> requested by Borislav Petkov yet, but I'll post it later separately,
> which would be better to focus on documentation reviewing.
>
> ChangeLog
>
> v3 => v4)
>
> - Rebased on top of v3.12-rc6
>
> - Basic design has been changed. Now users need to figure out initial
> APIC ID of BSP in the 1st kernel and configures kernel parameter for
> the 2nd kernel manually using disable_cpu_apic kernel parameter to
> be newly introduced in this patch set. This design is more flexible
> than the previous version in that we no longer have to rely on
> ACPI/MP table to get initial APIC ID of BSP.
>
Daisuke,
I have back ported version 4 of this patch to both a 2.6.32 and 3.0.80
based kernels and distros and tested on a prototype system. I have
previously test version 1 & 3 as well.)
The systems are configured to boot the capture kernel 8-way parallel.
However, I am running makedumpfile single threaded.
Panic is induced via "echo c > /proc/sysrq-trigger". This is done
under various system loads and on random cpus. I have done over a
thousand dumps total during this testing.
I have seen no issues w/ the 3.0.80 dump testing on our proto.
On the 2.6.32 testing on our proto, i have hit a low probability (< 5%)
chance of the capture suffering a soft lockup hang during
"Switching to clocksource hpet." I have not RCA'd this yet.
Note, I have seen this issue on earlier version of the patch, so
it is not specific to this version.
I then tested the 2.6.32 port on a dl380. This worked without issue.
Note, I have seen no issues related to this patch on our proto when
booting the capture with a single processor.
While I am still pursuing the issue of the 2.6.32 kernel on our proto,
I believe this patch is good and should be accepted.
thanks
Jerry
--
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Jerry Hoemann Software Engineer Hewlett-Packard/MODL
3404 E Harmony Rd. MS 57 phone: (970) 898-1022
Ft. Collins, CO 80528 FAX: (970) 898-XXXX
email: jerry.hoem...@hp.com
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