In current implementation, after unfreezing, we doesn't touch oldpage, so it remain 'NOT NULL'. When we call this_cpu_cmpxchg() with this old oldpage, this_cpu_cmpxchg() is mostly be failed.
We can change value of oldpage to NULL after unfreezing, because unfreeze_partial() ensure that all the cpu partial slabs is removed from cpu partial list. In this time, we could expect that this_cpu_cmpxchg is mostly succeed. Signed-off-by: Joonsoo Kim <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: David Rientjes <[email protected]> Acked-by: Christoph Lameter <[email protected]> --- Hello, Pekka. These two patches get "Acked-by: Christoph Lameter <[email protected]>", but, I don't hear any answer from U. Could you review these, please? Thanks! diff --git a/mm/slub.c b/mm/slub.c index e517d43..ca778e5 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1952,6 +1952,7 @@ int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain) local_irq_save(flags); unfreeze_partials(s); local_irq_restore(flags); + oldpage = NULL; pobjects = 0; pages = 0; stat(s, CPU_PARTIAL_DRAIN); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
