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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