On Fri, 14 Feb 2014, Joonsoo Kim wrote:

In free_block(), if freeing object makes new free slab and number of
free_objects exceeds free_limit, we start to destroy this new free slab
with holding the kmem_cache node lock. Holding the lock is useless and,
generally, holding a lock as least as possible is good thing. I never
measure performance effect of this, but we'd be better not to hold the lock
as much as possible.

This is also good because kmem_cache_free is no longer called while
holding the node lock. So we avoid one case of recursion.

Acked-by: Christoph Lameter <redacted>

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