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From: Anton Starikov on 23 Mar 2010 14:10

On Mar 23, 2010, at 7:00 PM, Ingo Molnar wrote:
>> NOTE! None of those are in 2.6.33 - they were merged afterwards. But they
>> are in 2.6.34-rc1 (and obviously current -git). So Anton would have to
>> compile his own kernel to test his load.
>
> another option is to run the rawhide kernel via something like:
>
> yum update --enablerepo=development kernel
>
> this will give kernel-2.6.34-0.13.rc1.git1.fc14.x86_64, which has those
> changes included.

I will apply this commits to 2.6.32, I afraid current OFED (which I need also) will not work on 2.6.33+.

Anton.--
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From: Anton Starikov on 23 Mar 2010 14:30
On Mar 23, 2010, at 7:21 PM, Andrew Morton wrote:
>> I will apply this commits to 2.6.32, I afraid current OFED (which I need also) will not work on 2.6.33+.
>>
>
> You should be able to simply set CONFIG_RWSEM_GENERIC_SPINLOCK=n,
> CONFIG_RWSEM_XCHGADD_ALGORITHM=y by hand, as I mentioned earlier?

Hm. I tried, but when I do "make oldconfig", then it gets rewritten, so I assume that it conflicts with some other setting from default fedora kernel config. trying to figure out which one exactly.

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From: Anton Starikov on 23 Mar 2010 14:30
On Mar 23, 2010, at 7:13 PM, Andrew Morton wrote:
> Anton, we have an executable binary in the bugzilla report but it would
> be nice to also have at least a description of what that code is
> actually doing. A quick strace shows quite a lot of mprotect activity.
> A pseudo-code walkthrough, perhaps?


Right now can't say too much about the code (we just gave a chance to neighbor group to run their code on our cluster, so I'm totally unfriendly with this code). I will forward your question to them.

But probably right now you can get more information (including sources) here http://fmt.cs.utwente.nl/tools/ltsmin/

Anton--
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From: Anton Starikov on 23 Mar 2010 15:40

On Mar 23, 2010, at 8:22 PM, Robin Holt wrote:

> On Tue, Mar 23, 2010 at 07:25:43PM +0100, Anton Starikov wrote:
>> On Mar 23, 2010, at 7:21 PM, Andrew Morton wrote:
>>>> I will apply this commits to 2.6.32, I afraid current OFED (which I need also) will not work on 2.6.33+.
>>>>
>>>
>>> You should be able to simply set CONFIG_RWSEM_GENERIC_SPINLOCK=n,
>>> CONFIG_RWSEM_XCHGADD_ALGORITHM=y by hand, as I mentioned earlier?
>>
>> Hm. I tried, but when I do "make oldconfig", then it gets rewritten, so I assume that it conflicts with some other setting from default fedora kernel config. trying to figure out which one exactly.
>
> Have you tracked this down yet? I just got the patches applied against
> an older kernel and am running into the same issue.

I decided to not track down this issue and just applied patches. I understood that with this patches there is no need to change this config options. Am I wrong?

Anton--
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From: Anton Starikov on 23 Mar 2010 15:50
I attach here callgraph.

Also I checked kernel source, actual code which was compiled is exactly what should be after patches.

Do I miss something?

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