Re: [gentoo-user] zcache + frontswap + cleancache: Am I missing something?

[Kerin Millar <kerframil@fastmail.co.uk>]

Florian Philipp wrote:
> Am 19.11.2012 18:51, schrieb Kerin Millar:
>> Florian Philipp wrote:
>>> Hi list!
>>>
>>> I'm wondering about the usage of frontswap and cleancache. Now that all
>>> pieces are in place in kernel-3.5, is it actually used?
>>>
>>> I've found references to cleancache and frontswap in several source
>>> files of the kernel (ext4, swapfile, page_io, ...).
>>> /sys/kernel/mm/zcache is also present but seems to indicate no usage at
>>> all. Content attached below.
>> It might be that you have enabled some of these options as loadable
>> modules: CONFIG_ZCACHE, CONFIG_CLEANCACHE and CONFIG_FRONTSWAP. If so,
>> build them directly into the kernel image instead.
>>
>> Cheers,
>>
>> --Kerin
>>
>
> You cannot build these as modules. Anyway, I'm recompiling right now
> with debugfs and configfs. Let's see if that tells me anything.
>
> Regards,
> Florian Philipp
>

Ah, good to know. I know that it was possible in some older kernels - 
while the feature was still in staging - but it must have since been fixed.

--Kerin