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powerpc/64: add 32 bytes prechecking before using VMX optimization on memcmp() 

This patch is based on the previous VMX patch on memcmp().

To optimize ppc64 memcmp() with VMX instruction, we need to think about
the VMX penalty brought with: If kernel uses VMX instruction, it needs
to save/restore current thread's VMX registers. There are 32 x 128 bits
VMX registers in PPC, which means 32 x 16 = 512 bytes for load and store.

The major concern regarding the memcmp() performance in kernel is KSM,
who will use memcmp() frequently to merge identical pages. So it will
make sense to take some measures/enhancement on KSM to see whether any
improvement can be done here.  Cyril Bur indicates that the memcmp() for
KSM has a higher possibility to fail (unmatch) early in previous bytes
in following mail.
	https://patchwork.ozlabs.org/patch/817322/#1773629
And I am taking a follow-up on this with this patch.

Per some testing, it shows KSM memcmp() will fail early at previous 32
bytes.  More specifically:
    - 76% cases will fail/unmatch before 16 bytes;
    - 83% cases will fail/unmatch before 32 bytes;
    - 84% cases will fail/unmatch before 64 bytes;
So 32 bytes looks a better choice than other bytes for pre-checking.

The early failure is also true for memcmp() for non-KSM case. With a
non-typical call load, it shows ~73% cases fail before first 32 bytes.

This patch adds a 32 bytes pre-checking firstly before jumping into VMX
operations, to avoid the unnecessary VMX penalty. It is not limited to
KSM case. And the testing shows ~20% improvement on memcmp() average
execution time with this patch.

And note the 32B pre-checking is only performed when the compare size
is long enough (>=4K currently) to allow VMX operation.

The detail data and analysis is at:
https://github.com/justdoitqd/publicFiles/blob/master/memcmp/README.md

Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Simon Guo 2018-06-07 09:57:54 +08:00 committed by Michael Ellerman
parent d58badfb7c
commit c2a4e54e8b
1 changed files with 46 additions and 11 deletions
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57
arch/powerpc/lib/memcmp_64.S
View File

@ -404,8 +404,27 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
#ifdef CONFIG_ALTIVEC
.Lsameoffset_vmx_cmp:
/* Enter with src/dst addrs has the same offset with 8 bytes
* align boundary
* align boundary.
*
* There is an optimization based on following fact: memcmp()
* prones to fail early at the first 32 bytes.
* Before applying VMX instructions which will lead to 32x128bits
* VMX regs load/restore penalty, we compare the first 32 bytes
* so that we can catch the ~80% fail cases.
*/
li r0,4
mtctr r0
.Lsameoffset_prechk_32B_loop:
LD rA,0,r3
LD rB,0,r4
cmpld cr0,rA,rB
addi r3,r3,8
addi r4,r4,8
bne cr0,.LcmpAB_lightweight
addi r5,r5,-8
bdnz .Lsameoffset_prechk_32B_loop
ENTER_VMX_OPS
beq cr1,.Llong_novmx_cmp
@ -482,16 +501,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
#endif
.Ldiffoffset_8bytes_make_align_start:
#ifdef CONFIG_ALTIVEC
BEGIN_FTR_SECTION
/* only do vmx ops when the size equal or greater than 4K bytes */
cmpdi cr5,r5,VMX_THRESH
bge cr5,.Ldiffoffset_vmx_cmp
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
.Ldiffoffset_novmx_cmp:
#endif
/* now try to align s1 with 8 bytes */
rlwinm r6,r3,3,26,28
beq .Ldiffoffset_align_s1_8bytes
@ -515,6 +524,17 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
.Ldiffoffset_align_s1_8bytes:
/* now s1 is aligned with 8 bytes. */
#ifdef CONFIG_ALTIVEC
BEGIN_FTR_SECTION
/* only do vmx ops when the size equal or greater than 4K bytes */
cmpdi cr5,r5,VMX_THRESH
bge cr5,.Ldiffoffset_vmx_cmp
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
.Ldiffoffset_novmx_cmp:
#endif
cmpdi cr5,r5,31
ble cr5,.Lcmp_lt32bytes
@ -526,6 +546,21 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
#ifdef CONFIG_ALTIVEC
.Ldiffoffset_vmx_cmp:
/* perform a 32 bytes pre-checking before
* enable VMX operations.
*/
li r0,4
mtctr r0
.Ldiffoffset_prechk_32B_loop:
LD rA,0,r3
LD rB,0,r4
cmpld cr0,rA,rB
addi r3,r3,8
addi r4,r4,8
bne cr0,.LcmpAB_lightweight
addi r5,r5,-8
bdnz .Ldiffoffset_prechk_32B_loop
ENTER_VMX_OPS
beq cr1,.Ldiffoffset_novmx_cmp