Messages in this thread | | | Date | Wed, 6 Nov 2013 12:02:32 -0700 | From | jerry.hoemann@hp ... | Subject | Re: [PATCH v4 0/3] x86, apic, kexec: Add disable_cpu_apic kernel parameter |
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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
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