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 <js1...@gmail.com>
Cc: Christoph Lameter <c...@linux.com>
Cc: David Rientjes <rient...@google.com>
Acked-by: Christoph Lameter <c...@linux.com>
---
Change log: Just add "Acked-by: Christoph Lameter <c...@linux.com>"
Resend as ping for Penberg
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
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