dirhash and dynamic memory allocation

[Ivan Voras]

On 14/10/2011 14:33, Miroslav Lachman wrote:
> 
> 
> Ivan Voras wrote:
>> On 14/10/2011 11:20, Miroslav Lachman wrote:
>>> Hi all,
>>>
>>> I tried some tuning of dirhash on our servers and after googlig a bit, I
>>> found an old GSoC project wiki page about Dynamic Memory Allocation for
>>> Dirhash: http://wiki.freebsd.org/DirhashDynamicMemory
>>> Is there any reason not to use it / not commit it to HEAD?
>>
>> AFAIK it's sort-of already present. In 8-stable and recent kernels you
>> can give huge amounts of memory to dirhash via vfs.ufs.dirhash_maxmem
>> (but except in really large edge cases I don't think you *need* more
>> than 32 MB), and the kernel will scale-down or free the memory if not
>> needed.
> 
> Is this change documented somewhere? Maybe it could be noticed on
> DirhashDynamicMemory wiki page. Otherwise it seems as abandoned GSoC
> project.

I'm not touching the wiki page because I don't know really if the
functionality was committed from the GSoC project or from somewhere
else; what I did was much later and much smaller in scope.

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