The ALLOC_SLOWPATH statistics is missing in bulk allocation now.  Fix it
by doing statistics in alloc slow path.
Signed-off-by: NAbel Wu <wuyun.wu@huawei.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: NPekka Enberg <penberg@kernel.org>
Acked-by: NDavid Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Hewenliang <hewenliang4@huawei.com>
Cc: Hu Shiyuan <hushiyuan@huawei.com>
Link: http://lkml.kernel.org/r/20200811022427.1363-1-wuyun.wu@huawei.comSigned-off-by: NLinus Torvalds <torvalds@linux-foundation.org>