Re: On shrinkable caches

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On 06/23/2016 12:43 PM, David Sterba wrote:
> On Mon, Jun 20, 2016 at 02:26:12PM +0300, Nikolay Borisov wrote:
>> I have a question regarding the SLAB_RECLAIM_ACCOUNT flag with which
>> BTRFS caches are created. Currently there isn't a single usage of
>> register_shrinker under fs/btrfs.
> 
> The SLAB_RECLAIM_ACCOUNT flag has been there since the first versions in
> 2007 (when shrinkeres did not exist) but I can't find any specific
> reason why.
> 
>> Apart from the inode cache which is
>> being shrunk from the generic super_cache_scan I don't think the memory
>> used for those caches should be accounted as reclaimable?
> 
> I agree, in most cases I don't see any possibility to reclaim the
> objects earlier than the explicit free.

If that's the case, then I'll be happy to send a patch.

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