Re: On shrinkable caches

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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.
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