The patch titled
Subject: mm: faster kmalloc_array(), kcalloc()
has been added to the -mm tree. Its filename is
mm-faster-kmalloc_array-kcalloc.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-faster-kmalloc_array-kcalloc.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-faster-kmalloc_array-kcalloc.patch
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------------------------------------------------------
From: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Subject: mm: faster kmalloc_array(), kcalloc()
When both arguments to kmalloc_array() or kcalloc() are known at compile
time then their product is known at compile time but search for kmalloc
cache happens at runtime not at compile time.
Link: http://lkml.kernel.org/r/20160627213454.GA2440@xxxxxxxxxxxxxxx
Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/slab.h | 2 ++
1 file changed, 2 insertions(+)
diff -puN include/linux/slab.h~mm-faster-kmalloc_array-kcalloc include/linux/slab.h
--- a/include/linux/slab.h~mm-faster-kmalloc_array-kcalloc
+++ a/include/linux/slab.h
@@ -565,6 +565,8 @@ static inline void *kmalloc_array(size_t
{
if (size != 0 && n > SIZE_MAX / size)
return NULL;
+ if (__builtin_constant_p(n) && __builtin_constant_p(size))
+ return kmalloc(n * size, flags);
return __kmalloc(n * size, flags);
}
_
Patches currently in -mm which might be from adobriyan@xxxxxxxxx are
mm-faster-kmalloc_array-kcalloc.patch
cflags-add-wunused-but-set-parameter.patch
ban-config_localversion_auto-with-allmodconfig.patch
ipc-delete-nr_ipc_ns.patch
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