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Mon, 23 Feb 2026 18:57:55 -0800 (PST) Date: Tue, 24 Feb 2026 02:57:54 +0000 From: Wei Yang To: Qi Zheng Cc: Wei Yang , akpm@linux-foundation.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, "David Hildenbrand (Arm)" , will@kernel.org, aneesh.kumar@kernel.org, peterz@infradead.org, npiggin@gmail.com Subject: Re: [PATCH] mm/mmu_gather: define RCU version tlb_remove_table_one() in CONFIG_MMU_GATHER_RCU_TABLE_FREE Message-ID: <20260224025754.z3g6sbq2huuk6fwo@master> Reply-To: Wei Yang References: <20260222004512.839-1-richard.weiyang@gmail.com> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20170113 (1.7.2) On Tue, Feb 24, 2026 at 10:09:18AM +0800, Qi Zheng wrote: >Hi Wei, > >On 2/22/26 8:45 AM, Wei Yang wrote: >> Before commit 718b13861d22 ("x86: mm: free page table pages by RCU >> instead of semi RCU"), the page table pages will be freed by semi RCU, >> that is: >> >> - batch table freeing: asynchronous free by RCU >> - single table freeing: IPI + synchronous free >> >> This commit introduce a RCU version for single table freeing to support >> PT_RECLAIM. While it is not necessary to limit the RCU version only in >> CONFIG_PT_RECLAIM. It is reasonable to asynchronous free single table by >> RCU if CONFIG_MMU_GATHER_RCU_TABLE_FREE. >> >> This patch moves the definition of single table freeing in >> CONFIG_MMU_GATHER_RCU_TABLE_FREE, so we have both RCU version >> batch/single table freeing if CONFIG_MMU_GATHER_RCU_TABLE_FREE. > >Thank you for doing this, but we can't do it right now. > >See the latest version: https://github.com/torvalds/linux/commit/9c8c02df3f8742f6db927e787ab971fd0b5ac08a, >when the >HAVE_ARCH_TLB_REMOVE_TABLE is selected, the pt_rcu_head member >cannot be used. > Thanks for point out. Don't notice the latest change. Andrew, Sorry for the bothering. Please drop this one. -- Wei Yang Help you, Help me