Re: [patch 0/5] [PATCH,RFC] vfs: per-superblock unused dentries list (2nd version)

[Jan Blunck]

On Mon, Jun 05, Neil Brown wrote:

> I understand that this is where problem is because the selected
> dentries don't stay at the end of the list very long in some
> circumstances. In particular, other filesystems' dentries get mixed
> in. 

No. The problem is that the LRU list is too long and therefore unmounting
seems to take ages.

> You have addressed this by having multiple unused lists so the
> dentries of other filesystems don't get mixed in.
> 
> It seems to me that an alternate approach would be:
> 
>   - get select_parent and shrink_dcache_anon to move the selected
>     dentries on to some new list.
>   - pass this list to prune_dcache
>   - splice any remainder back on to the global list when finished.

I had this idea too. At least select_parent could use something like that. But
that wouldn't help in the umount situation.

Jan
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