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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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b3f271e86e
Implement a POWER7 optimised memcpy using VMX and enhanced prefetch
instructions.
This is a copy of the POWER7 optimised copy_to_user/copy_from_user
loop. Detailed implementation and performance details can be found in
commit a66086b819 (powerpc: POWER7 optimised
copy_to_user/copy_from_user using VMX).
I noticed memcpy issues when profiling a RAID6 workload:
.memcpy
.async_memcpy
.async_copy_data
.__raid_run_ops
.handle_stripe
.raid5d
.md_thread
I created a simplified testcase by building a RAID6 array with 4 1GB
ramdisks (booting with brd.rd_size=1048576):
# mdadm -CR -e 1.2 /dev/md0 --level=6 -n4 /dev/ram[0-3]
I then timed how long it took to write to the entire array:
# dd if=/dev/zero of=/dev/md0 bs=1M
Before: 892 MB/s
After: 999 MB/s
A 12% improvement.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
36 lines
987 B
Makefile
36 lines
987 B
Makefile
#
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# Makefile for ppc-specific library files..
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#
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subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
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ccflags-$(CONFIG_PPC64) := -mno-minimal-toc
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CFLAGS_REMOVE_code-patching.o = -pg
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CFLAGS_REMOVE_feature-fixups.o = -pg
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obj-y := string.o alloc.o \
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checksum_$(CONFIG_WORD_SIZE).o crtsavres.o
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obj-$(CONFIG_PPC32) += div64.o copy_32.o
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obj-$(CONFIG_HAS_IOMEM) += devres.o
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obj-$(CONFIG_PPC64) += copypage_64.o copyuser_64.o \
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memcpy_64.o usercopy_64.o mem_64.o string.o \
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checksum_wrappers_64.o hweight_64.o \
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copyuser_power7.o string_64.o copypage_power7.o \
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memcpy_power7.o
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obj-$(CONFIG_XMON) += sstep.o ldstfp.o
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obj-$(CONFIG_KPROBES) += sstep.o ldstfp.o
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obj-$(CONFIG_HAVE_HW_BREAKPOINT) += sstep.o ldstfp.o
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ifeq ($(CONFIG_PPC64),y)
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obj-$(CONFIG_SMP) += locks.o
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obj-$(CONFIG_ALTIVEC) += vmx-helper.o
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endif
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obj-$(CONFIG_PPC_LIB_RHEAP) += rheap.o
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obj-y += code-patching.o
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obj-y += feature-fixups.o
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obj-$(CONFIG_FTR_FIXUP_SELFTEST) += feature-fixups-test.o
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