Re: Kernel config option which causes reiser4 to be instable

[Edward Shishkin <edward.shishkin@gmail.com>]

On 12/14/2012 04:14 AM, Ivan Shapovalov wrote:
> On 13 December 2012 23:47:10 Edward Shishkin wrote:
>> On 12/11/2012 09:54 PM, Dušan Čolić wrote:
>>> On Tue, Dec 11, 2012 at 7:33 PM, Edward Shishkin
>>>
>>> <edward.shishkin@gmail.com>   wrote:
>>>> On 12/11/2012 04:08 PM, Ivan Shapovalov wrote:
>>>>> Hello!
>>>>
>>>> Hello.
>>>>
>>>>> With help of Dušan Čolić<dusanc@gmail.com>   who provided his kernel
>>>>> config
>>>>> diff I've found a kernel option which, when disabled, greatly reduces
>>>>> (hopefully to zero, but need time to verify it) corruption rate in
>>>>> reiser4.
>>>>>
>>>>> It's CONFIG_TRANSPARENT_HUGEPAGE (or something which is used by it like
>>>>> CONFIG_COMPACTION or CONFIG_MIGRATION).
>>>>> For now I'm testing it with CONFIG_TRANSPARENT_HUGEPAGE disabled
>>>>
>>>> How long?
>>>
>>> For me the difference in uptime is months without vs hours with it :D
>>> on 2.6.39.4
>>
>> Hm, indeed: my setup with enabled migration can not survive even one
>> kernel compilation, while with disabled migration everything looks ok..
>
> The overnight testing also showed no errors...
> So shall we release reiser4-for-3.7 and announce FIXED(?) once again?
> :)


I worry that migration is mandatory option for hugepages.
Does fail_migrate_page() work with hugepages?

Also before the release I'll try to take a look at this:
http://marc.info/?l=reiserfs-devel&m=135402207623711&w=2

This failed path might indicate that we adjusted to fs-writeback
incorrectly.

Edward.

>
> Regards,
> Ivan.
>
>>
>>>>>     on kernel
>>>>>
>>>>> 3.6.10, and everything seems to be OK so far (so the workaround is
>>>>> version-
>>>>> agnostic).
>>>>>
>>>>> Edward, are there any guesses on what can make reiser4 choke on
>>>>> hugepages/compaction/migration?
>>>>
>>>> TBH, no ideas. They (hugepages) are _transparent_.
>>>> It means we shouldn't suffer in theory ;)
>>>>
>>>>>     I'm not even barely familiar with the kernel
>>>>>
>>>>> internals.
>>>>>
>>>>> Thanks,
>>>>> Ivan.

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