Re: [PATCH] shrink_dcache_parent() races against shrink_dcache_memory()

[Kirill Korotaev <dev@sw.ru>]

Hello Jan,

> > this is much cleaner now and looks more like my original patch and is 
> > smaller/more beautifull with counters usage. Thanks.
>
>
> Yes, it is heavily inspired by you patch.
thanks again. BTW, out of curiosity why do you work on this?

> > However, with counters instead of list it is possible to create a live 
> > lock :( So I'm not sure it is really ok.
>
>
> Hmm, I don't really get what you mean with "live lock".
By "live lock" I mean the situation when you are "locked" in 
shrink_dcache_parent() due to wait_on_prunes() always returns 1.
We used shrinker list with a reference to dentry specially to avoid this 
as much as possible. I'm not sure how real such live lock can be 
created, but I can think it over.

> > BTW, what kernel is it for? 2.6.15 or 2.6.16-X?
>
>
> http://www.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git from
> today.
thanks!

Kirill

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