linux-kernel - Re: kexec boot regression

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Date:	Tue, 15 Dec 2009 13:50:10 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>, mingo@...e.hu,
	rdreier@...co.com, Suresh Siddha <suresh.b.siddha@...el.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Huang Ying <ying.huang@...el.com>, rientjes@...gle.com
Subject: Re: kexec boot regression

Jens Axboe wrote:
> On Tue, Dec 15 2009, Yinghai Lu wrote:
>> Jens Axboe wrote:
>>> On Tue, Dec 15 2009, Jens Axboe wrote:
>>>> On Tue, Dec 15 2009, Yinghai Lu wrote:
>>>>> Jens Axboe wrote:
>>>>>> On Tue, Dec 15 2009, Jens Axboe wrote:
>>>>>>> On Tue, Dec 15 2009, Jens Axboe wrote:
>>>>>>>> On Tue, Dec 15 2009, Yinghai Lu wrote:
>>>>>>>>> Jens Axboe wrote:
>>>>>>>>>> On Tue, Dec 15 2009, Yinghai Lu wrote:
>>>>>>>>>>> Jens Axboe wrote:
>>>>>>>>>>>> On Tue, Dec 15 2009, Yinghai Lu wrote:
>>>>>>>>>>>>> Jens Axboe wrote:
>>>>>>>>>>>>>> On Tue, Dec 15 2009, Yinghai Lu wrote:
>>>>>>>>>>>>>>> [PATCH] x86/pci: intel ioh bus num reg accessing fix
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> it is above 0x100, so if mmconf is not enable, need to skip it
>>>>>>>>>>>>>> This works, it kexecs kernels fine. But since 2.6.32 doesn't have the
>>>>>>>>>>>>>> mmconf problem to begin with, are we now just working around the issue?
>>>>>>>>>>>>>> SRAT still reports issues, numa doesn't work.
>>>>>>>>>>>>> that patch will be bullet proof... we need it.
>>>>>>>>>>>>>
>>>>>>>>>>>>> also still need to figure out why memmap range is not passed properly.
>>>>>>>>>>>>>
>>>>>>>>>>>>> do you mean 2.6.32 kexec 2.6.32 it have worked mmconf and numa in
>>>>>>>>>>>>> second kernel?
>>>>>>>>>>>> Yes, 2.6.32 booted and 2.6.32 kexec'ed works just fine, no SRAT
>>>>>>>>>>>> complaints and NUMA works fine.
>>>>>>>>>>> do you need 
>>>>>>>>>>> memmap=62G@4G
>>>>>>>>>>> in this case?
>>>>>>>>>> Yes, I've needed that always.
>>>>>>>>> good,
>>>>>>>>>
>>>>>>>>> can you enable debug option in kexec to see why kexec can not pass
>>>>>>>>> whole 38? range to second kernel?
>>>>>>>> Not getting any output so far, -d doesn't do much. Poking around in the
>>>>>>>> source...
>>>>>>> OK, cold boot and kexec 2.0.1 gets all 39 ranges passed properly to
>>>>>>> kexec'ed kernels. Since the older kexec stopped at range 30 (31 ranges
>>>>>>> total), that smells like just a kexec bug. Retesting -git...
>>>>>> Current -git works fine when all the ranges are passed correctly. So, I
>>>>>> think, the only existing regression is the SRAT issue.
>>>>> did you change node_shift?
>>>> Yes:
>>>>
>>>> CONFIG_NODES_SHIFT=6
>>>>
>>>> What I don't get is that 2.6.32 and -git print the same PXM map, and in
>>>> both cases it's totalling exactly 64G. Yet it says:
>>>>
>>>> SRAT: PXMs only cover 49035MB of your 65419MB e820 RAM. Not used.
>>> Clue:
>>>
>>> [    0.000000] SRAT: Node 0 PXM 0 0-80000000
>>> [    0.000000] SRAT: Node 0 PXM 0 100000000-480000000
>>> [    0.000000] SRAT: Node 2 PXM 1 480000000-880000000
>>> [    0.000000] SRAT: Node 1 PXM 2 880000000-c80000000
>>> [    0.000000] SRAT: Node 3 PXM 3 c80000000-1080000000
>>> [    0.000000] NUMA: Using 31 for the hash shift.
>>> [    0.000000] pxm0: 0-480000 (4718592), absent 553990
>>> [    0.000000] pxm1: 880000-c80000 (4194304), absent 0
>>> [    0.000000] pxm2: 480000-880000 (4194304), absent 4194304
>>> [    0.000000] pxm3: c80000-1080000 (4194304), absent 0
>>> [    0.000000] SRAT: PXMs only cover 49035MB of your 65419MB e820 RAM.  Not used.
>>> [    0.000000] SRAT: SRAT not used.
>>>
>> oh, i post one patch last week, 
>>
>> can you check it?
> 
> Sure, let me try it. I already found out that commit 8716273c is the
> guilty one (x86: Export srat physical topology).

ok, my patch should fix that.

YH
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