diff options
author | Anton Blanchard <anton@samba.org> | 2010-02-10 13:07:54 -0500 |
---|---|---|
committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-02-16 22:03:16 -0500 |
commit | 63e6c5b8102af7df7a5e1cebbd865d711645886a (patch) | |
tree | 8dd79a95cf5265b6e1d88bed1493c0b952d23992 /arch/powerpc/lib | |
parent | 5a0e9b5718d921f5d8e17176d6b483f6b8f1844a (diff) |
powerpc: Pair loads and stores in copy_4k_page
A number of our chips like loads and stores to be paired. A small kernel
module testcase shows the improvement of pairing loads and stores in
copy_4k_page:
POWER6: +9%
POWER7: +1.5%
#include <linux/module.h>
#include <linux/mm.h>
#define ITERATIONS 10000000
static int __init copypage_init(void)
{
struct timespec before, after;
unsigned long i;
struct page *destpage, *srcpage;
char *dest, *src;
destpage = alloc_page(GFP_KERNEL);
srcpage = alloc_page(GFP_KERNEL);
dest = page_address(destpage);
src = page_address(srcpage);
getnstimeofday(&before);
for (i = 0; i < ITERATIONS; i++)
copy_4K_page(dest, src);
getnstimeofday(&after);
free_page((unsigned long)dest);
free_page((unsigned long)src);
printk(KERN_DEBUG "copy_4K_page loop took %lu ns\n",
(after.tv_sec - before.tv_sec) * NSEC_PER_SEC +
(after.tv_nsec - before.tv_nsec));
return 0;
}
static void __exit copypage_exit(void)
{
}
module_init(copypage_init)
module_exit(copypage_exit)
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Anton Blanchard");
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/lib')
-rw-r--r-- | arch/powerpc/lib/copypage_64.S | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/arch/powerpc/lib/copypage_64.S b/arch/powerpc/lib/copypage_64.S index e68beac0a171..4d4eeb900486 100644 --- a/arch/powerpc/lib/copypage_64.S +++ b/arch/powerpc/lib/copypage_64.S | |||
@@ -43,62 +43,62 @@ END_FTR_SECTION_IFSET(CPU_FTR_CP_USE_DCBTZ) | |||
43 | ld r7,16(r4) | 43 | ld r7,16(r4) |
44 | ldu r8,24(r4) | 44 | ldu r8,24(r4) |
45 | 1: std r5,8(r3) | 45 | 1: std r5,8(r3) |
46 | ld r9,8(r4) | ||
47 | std r6,16(r3) | 46 | std r6,16(r3) |
47 | ld r9,8(r4) | ||
48 | ld r10,16(r4) | 48 | ld r10,16(r4) |
49 | std r7,24(r3) | 49 | std r7,24(r3) |
50 | ld r11,24(r4) | ||
51 | std r8,32(r3) | 50 | std r8,32(r3) |
51 | ld r11,24(r4) | ||
52 | ld r12,32(r4) | 52 | ld r12,32(r4) |
53 | std r9,40(r3) | 53 | std r9,40(r3) |
54 | ld r5,40(r4) | ||
55 | std r10,48(r3) | 54 | std r10,48(r3) |
55 | ld r5,40(r4) | ||
56 | ld r6,48(r4) | 56 | ld r6,48(r4) |
57 | std r11,56(r3) | 57 | std r11,56(r3) |
58 | ld r7,56(r4) | ||
59 | std r12,64(r3) | 58 | std r12,64(r3) |
59 | ld r7,56(r4) | ||
60 | ld r8,64(r4) | 60 | ld r8,64(r4) |
61 | std r5,72(r3) | 61 | std r5,72(r3) |
62 | ld r9,72(r4) | ||
63 | std r6,80(r3) | 62 | std r6,80(r3) |
63 | ld r9,72(r4) | ||
64 | ld r10,80(r4) | 64 | ld r10,80(r4) |
65 | std r7,88(r3) | 65 | std r7,88(r3) |
66 | ld r11,88(r4) | ||
67 | std r8,96(r3) | 66 | std r8,96(r3) |
67 | ld r11,88(r4) | ||
68 | ld r12,96(r4) | 68 | ld r12,96(r4) |
69 | std r9,104(r3) | 69 | std r9,104(r3) |
70 | ld r5,104(r4) | ||
71 | std r10,112(r3) | 70 | std r10,112(r3) |
71 | ld r5,104(r4) | ||
72 | ld r6,112(r4) | 72 | ld r6,112(r4) |
73 | std r11,120(r3) | 73 | std r11,120(r3) |
74 | ld r7,120(r4) | ||
75 | stdu r12,128(r3) | 74 | stdu r12,128(r3) |
75 | ld r7,120(r4) | ||
76 | ldu r8,128(r4) | 76 | ldu r8,128(r4) |
77 | bdnz 1b | 77 | bdnz 1b |
78 | 78 | ||
79 | std r5,8(r3) | 79 | std r5,8(r3) |
80 | ld r9,8(r4) | ||
81 | std r6,16(r3) | 80 | std r6,16(r3) |
81 | ld r9,8(r4) | ||
82 | ld r10,16(r4) | 82 | ld r10,16(r4) |
83 | std r7,24(r3) | 83 | std r7,24(r3) |
84 | ld r11,24(r4) | ||
85 | std r8,32(r3) | 84 | std r8,32(r3) |
85 | ld r11,24(r4) | ||
86 | ld r12,32(r4) | 86 | ld r12,32(r4) |
87 | std r9,40(r3) | 87 | std r9,40(r3) |
88 | ld r5,40(r4) | ||
89 | std r10,48(r3) | 88 | std r10,48(r3) |
89 | ld r5,40(r4) | ||
90 | ld r6,48(r4) | 90 | ld r6,48(r4) |
91 | std r11,56(r3) | 91 | std r11,56(r3) |
92 | ld r7,56(r4) | ||
93 | std r12,64(r3) | 92 | std r12,64(r3) |
93 | ld r7,56(r4) | ||
94 | ld r8,64(r4) | 94 | ld r8,64(r4) |
95 | std r5,72(r3) | 95 | std r5,72(r3) |
96 | ld r9,72(r4) | ||
97 | std r6,80(r3) | 96 | std r6,80(r3) |
97 | ld r9,72(r4) | ||
98 | ld r10,80(r4) | 98 | ld r10,80(r4) |
99 | std r7,88(r3) | 99 | std r7,88(r3) |
100 | ld r11,88(r4) | ||
101 | std r8,96(r3) | 100 | std r8,96(r3) |
101 | ld r11,88(r4) | ||
102 | ld r12,96(r4) | 102 | ld r12,96(r4) |
103 | std r9,104(r3) | 103 | std r9,104(r3) |
104 | std r10,112(r3) | 104 | std r10,112(r3) |