Messages in this thread | | | Subject | Re: [PATCH 0/1] __asm_copy_to-from_user: Reduce more byte_copy | From | Akira Tsukamoto <> | Date | Thu, 12 Aug 2021 20:01:29 +0900 |
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Hi Guenter, Geert and Qiu,
Would you mind testing this patch? Thanks,
Akira
On 7/30/2021 10:50 PM, Akira Tsukamoto wrote: > Adding none unrolling word_copy, which is used if the size is smaller > than 9*SZREG. > > This patch is based on Palmer's past comment. >> My guess is that some workloads will want some smaller unrolling factors, > > It will reduce the number of slow byte_copy being used when the > size is small. > > Have tested on qemu rv32, qemu rv64 and beaglev beta board. > > In the future, I am planning to convert uaccess.S to inline assembly > in .c file. Then it will be easier to optimize on both in-order core and > out-of-order core with #ifdef macro in c. > > Akira Tsukamoto (1): > riscv: __asm_copy_to-from_user: Improve using word copy if size < > 9*SZREG > > arch/riscv/lib/uaccess.S | 46 ++++++++++++++++++++++++++++++++++++---- > 1 file changed, 42 insertions(+), 4 deletions(-) >
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