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Fri, 16 Apr 2021 16:42:49 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mail.ustc.edu.cn; s=dkim; h=Received:Date:From:To:Cc:Subject: Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding; bh=V43aKoKjJB1GJ8L7DevKb0+AH+9zmQ4aFsOcNjBKj8s=; b=lzmx+h887qjx7 O0htMlV0I1+BsqSCqTegZP4WtLOZkUTUyye/MuHnceRA7RhAunqWF42YwuPUyZxU sLX0tJr7Db9mu0GK9EhJHlELFjAYj9JcLEa61JvYojRYztWTH/KVh5ZIeJRTRbtK NOeB81WkiWOQy+m0u1CUin2hyGghKo= Received: from xhacker (unknown [101.86.20.15]) by newmailweb.ustc.edu.cn (Coremail) with SMTP id LkAmygAnLkpyvnlgag7tAA--.45092S2; Sat, 17 Apr 2021 00:42:28 +0800 (CST) Date: Sat, 17 Apr 2021 00:37:22 +0800 From: Jisheng Zhang To: Paul Walmsley , Palmer Dabbelt , Albert Ou Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [RFT PATCH] riscv: mremap speedup - enable HAVE_MOVE_PUD and HAVE_MOVE_PMD Message-ID: <20210417003539.5bceabc2@xhacker> MIME-Version: 1.0 X-CM-TRANSID: LkAmygAnLkpyvnlgag7tAA--.45092S2 X-Coremail-Antispam: 1UD129KBjvJXoW7KFy3tw1rZw4rXw1rXrWrXwb_yoW8Zw4kpr ZIkF9akrZxWF1Ik3yayry8W3yru3Z3WaySqryxGa48ZrW5trWDZrn2qw45JryUGFyvv3s3 Wa13Kry5G3y7u37anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUyIb7Iv0xC_tr1lb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I2 0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rw A2F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xII jxv20xvEc7CjxVAFwI0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVWxJVW8Jr1l84ACjcxK6I 8E87Iv6xkF7I0E14v26r4UJVWxJr1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xv F2IEw4CE5I8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_Jr0_Jr4lYx0Ex4A2jsIE14v26r1j6r 4UMcvjeVCFs4IE7xkEbVWUJVW8JwACjcxG0xvEwIxGrwCF04k20xvY0x0EwIxGrwCFx2Iq xVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r 106r1rMI8E67AF67kF1VAFwI0_JF0_Jw1lIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AK xVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Jr0_Gr1lIxAIcVCF04k26cxKx2IYs7 xG6rW3Jr0E3s1lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVWU JVW8JbIYCTnIWIevJa73UjIFyTuYvjxUcVWlDUUUU X-CM-SenderInfo: xmv2xttqjtqzxdloh3xvwfhvlgxou0/ X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210416_094245_625903_2A9C19FF X-CRM114-Status: UNSURE ( 8.90 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Jisheng Zhang HAVE_MOVE_PUD enables remapping pages at the PUD level if both the source and destination addresses are PUD-aligned. HAVE_MOVE_PMD does similar speedup on the PMD level. With HAVE_MOVE_PUD enabled, there is about a 143x improvement on qemu With HAVE_MOVE_PMD enabled, there is about a 5x improvement on qemu Signed-off-by: Jisheng Zhang --- Hi all, After reading the risc-v privileged spec, I think it's safe to support the HAVE_MOVE_PUD and HAVE_MOVE_PMD optimization on riscv. The patch passed the mremap_test on QEMU. However this can't be tested on real HW due to lack of HW boards, this is the reason why I mark this patch as RFT. I hope I can buy a sipeed Allwiner D1 SoC powered SBC soon, at least I can test HAVE_MOVE_PMD. Helping me to test on real HW is appreciated! Thanks arch/riscv/Kconfig | 2 ++ arch/riscv/include/asm/pgtable.h | 12 ++++++++++++ 2 files changed, 14 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index e8074d248457..37660de68b00 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -80,6 +80,8 @@ config RISCV select HAVE_KPROBES select HAVE_KPROBES_ON_FTRACE select HAVE_KRETPROBES + select HAVE_MOVE_PMD + select HAVE_MOVE_PUD select HAVE_PCI select HAVE_PERF_EVENTS select HAVE_PERF_REGS diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index ebf817c1bdf4..287733b95d10 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -360,6 +360,18 @@ static inline void set_pte_at(struct mm_struct *mm, set_pte(ptep, pteval); } +static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, + pmd_t *pmdp, pmd_t pmd) +{ + set_pmd(pmdp, pmd); +} + +static inline void set_pud_at(struct mm_struct *mm, unsigned long addr, + pud_t *pudp, pud_t pud) +{ + set_pud(pudp, pud); +} + static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { -- 2.31.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv