Re: negative dentry_stat.nr_unused causes aggressive dcache pruning

[Andrew Morton]

Steve Lord <lord@xxxxxxx> wrote:
>
> I have seen this stat go negative (just from booting up a multi cpu box),
>  and looking at the code, it is manipulated without locking in a number
>  of places. I have only seen this in real life on a 2.4 kernel, but 2.6
>  also looks vulnerable.

In 2.6, both dentry_stat.nr_unused and dentry_stat.nr_dentry are covered
by dcache_lock.  I just double-checked and all seems well.
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