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Mon, 01 Sep 2025 04:41:49 -0700 (PDT) From: Xu Lu To: paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, apw@canonical.com, joe@perches.com, Xu Lu Subject: [PATCH RESEND 0/2] riscv: mm: Some optimizations for tlb flush Date: Mon, 1 Sep 2025 19:41:39 +0800 Message-Id: <20250901114141.5438-1-luxu.kernel@bytedance.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Some optimizations for tlb flush on RISC-V smp: 1. Apply Svinval in update_mmu_cache() to avoid flushing irrelevant tlb entries. 2. Clear bit of current cpu in mm_cpumask after local_flush_tlb_all_asid() to avoid potential IPIs in the future. We saw the number of IPI reduced from ~98k to 268 on mmapstress01 benchmark. Some false positive spacing error happens during patch checking. Thus I CCed maintainers of checkpatch.pl as well. Xu Lu (2): riscv: mm: Apply svinval in update_mmu_cache() riscv: mm: Clear cpu in mm_cpumask after local_flush_tlb_all_asid arch/riscv/include/asm/pgtable.h | 16 +++++++- arch/riscv/include/asm/tlbflush.h | 23 +++++++++++ arch/riscv/mm/tlbflush.c | 64 ++++++++++++------------------- 3 files changed, 63 insertions(+), 40 deletions(-) -- 2.20.1