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    SubjectRe: [RFC, PATCH, RESEND] fs: push rcu_barrier() from deactivate_locked_super() to filesystems
    On Sat, Jun 09, 2012 at 01:14:46AM +0300, Kirill A. Shutemov wrote:
    > > The implementation would be less unpleasant if we could do the
    > > rcu_barrier() in kmem_cache_destroy(). I can't see a way of doing that
    > > without adding a dedicated slab flag, which would require editing all
    > > the filesystems anyway.
    > I think rcu_barrier() for all kmem_cache_destroy() would be too expensive.

    You've got to be kidding. Please, show us the codepath that would be hot
    enough to make that too expensive and would contain kmem_cache_destroy().
    Note that module unload is *not* a hot path - not on any even remotely sane

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