On Wed, 9 May 2007, Nick Piggin wrote:
> SLAB_DESTROY_BY_RCU is quite a nice way to mitigate some RCU freeing
> overheads for small objects, so I'd expect it may see wider use in
> future. Maybe all those users would be fine too, but it's a bit nasty
> to have already tricky RCU semantics deviate...
Signal handling is using RCU too right?
> > I think if we want RCU to actually work, we want to run ->dtor in
> > __kmem_cache_free?
>
> Yeah, thinko... thanks.
According to SLAB code: RCU cannot have a dtor.
kmem_cache_create()
if (flags & SLAB_DESTROY_BY_RCU)
BUG_ON(dtor);
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