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X-CSE-ConnectionGUID: aiDLsHkqQ9C1Mjw3EQ47Nw== X-CSE-MsgGUID: 80/DJkwmTFWipGyVJyASNA== X-IronPort-AV: E=McAfee;i="6600,9927,11069"; a="11275283" X-IronPort-AV: E=Sophos;i="6.08,153,1712646000"; d="scan'208";a="11275283" Received: from orviesa008.jf.intel.com ([10.64.159.148]) by fmvoesa113.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2024 00:16:57 -0700 X-CSE-ConnectionGUID: B3atYuulRImHw5DRnz8icA== X-CSE-MsgGUID: 8qNNcdoaQ/iVPMV/UUScwQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,153,1712646000"; d="scan'208";a="30409213" Received: from unknown (HELO yhuang6-desk2.ccr.corp.intel.com) ([10.238.208.55]) by orviesa008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2024 00:16:53 -0700 From: "Huang, Ying" To: Byungchul Park Cc: , , , , , , , , , , , , , , , Subject: Re: [PATCH v10 00/12] LUF(Lazy Unmap Flush) reducing tlb numbers over 90% In-Reply-To: <20240510065206.76078-1-byungchul@sk.com> (Byungchul Park's message of "Fri, 10 May 2024 15:51:54 +0900") References: <20240510065206.76078-1-byungchul@sk.com> Date: Sat, 11 May 2024 15:15:01 +0800 Message-ID: <87eda8g6q2.fsf@yhuang6-desk2.ccr.corp.intel.com> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain; charset=ascii X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 536261C000E X-Stat-Signature: b4e183udokyzz1q5w1ubwmhgb84t6roo X-HE-Tag: 1715411819-542459 X-HE-Meta: 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 5PkhemJ7 o0Gwtoqj4rSgI9eeNI2JpS5+MZ7Mn4lvOS7DYb9vhJw8fY9nHaNdzScw2ERICzUzHugcsChYIRS1zfyn2nKBKHGhJIlfdGxDHJBm+BpTLWus+Z3Q4ejcwph+VM8a66JHrRMHB2XB1GOEzacH/b/YGqg3ovSQM6Xrjxz9tnzenY/3rAFyfWomNYMVas929jEzOnKAOSTXzDaQPFsUxn/kWjMkt1xa6//9zu2CEiA+3L7kAeT+cJV4JIhRzzo2Xf4QoVD2rBow92wMxX/hY9hgOs9jE2jG0VTvpsUru651La/YiUpbW6JU2NVfFsDxWQRx5lASOh9HeNVyq7ls= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Byungchul Park writes: > Hi everyone, > > While I'm working with a tiered memory system e.g. CXL memory, I have > been facing migration overhead esp. tlb shootdown on promotion or > demotion between different tiers. Yeah.. most tlb shootdowns on > migration through hinting fault can be avoided thanks to Huang Ying's > work, commit 4d4b6d66db ("mm,unmap: avoid flushing tlb in batch if PTE > is inaccessible"). See the following link for more information: > > https://lore.kernel.org/lkml/20231115025755.GA29979@system.software.com/ And, I still have interest of the performance impact of commit 7e12beb8ca2a ("migrate_pages: batch flushing TLB"). In the email above, you said that the performance of v6.5-rc5 + 7e12beb8ca2a reverted has better performance than v6.5-rc5. Can you provide more details? For example, the number of TLB flushing IPI for two kernels? I should have followed up the above email. Sorry about that. Anyway, we should try to fix issue of that commit too. -- Best Regards, Huang, Ying [snip]