Re: [patch 08/10] SLUB: Optional fast path using cmpxchg_local

Christoph Lameter
2007-10-29T02:59:43Z

On Sun, 28 Oct 2007, Pekka J Enberg wrote:

> Can you please write a comment of the locking rules when cmpxchg_local()
> is used? Looks as if we could push that local_irq_save() to slub_lock()
> and local_irq_restore() to slub_unlock() and deal with the unused flags
> variable for the non-CONFIG_FAST_CMPXCHG_LOCAL case with a macro, no?

Hmmmm... Maybe .. The locking rules are not changed at all by this patch.
The cmpxchg_local is only used for the per cpu object list. The per cpu
slabs are frozen.