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X-CSE-ConnectionGUID: 5mlT0j8YQ+6MJ/RN97z5iA== X-CSE-MsgGUID: IcRsX1vhRG64dfLLlTnfdw== X-IronPort-AV: E=McAfee;i="6600,9927,11084"; a="13194004" X-IronPort-AV: E=Sophos;i="6.08,191,1712646000"; d="scan'208";a="13194004" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 May 2024 19:43:12 -0700 X-CSE-ConnectionGUID: GN87OtXBQdaU1xN+QmUOzw== X-CSE-MsgGUID: Nn//7A8sQU2AZ6HuU2jAjQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,191,1712646000"; d="scan'208";a="34593873" Received: from kinlongk-desk.amr.corp.intel.com (HELO [10.125.110.200]) ([10.125.110.200]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 May 2024 19:43:11 -0700 Message-ID: Date: Sun, 26 May 2024 19:43:10 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 00/12] LUF(Lazy Unmap Flush) reducing tlb numbers over 90% To: Byungchul Park Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, kernel_team@skhynix.com, akpm@linux-foundation.org, ying.huang@intel.com, vernhao@tencent.com, mgorman@techsingularity.net, hughd@google.com, willy@infradead.org, david@redhat.com, peterz@infradead.org, luto@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, rjgolo@gmail.com References: <20240510065206.76078-1-byungchul@sk.com> <982317c0-7faa-45f0-82a1-29978c3c9f4d@intel.com> <20240527015732.GA61604@system.software.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: A378110000E X-Stat-Signature: d6gm49dp57jdt5xwn9dsar74hwg1impz X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1716777793-913896 X-HE-Meta: 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 sCkb9ywe Rv9YoLbqxJ5a7+EwF5/sOx12BO9QCC/2nMo0Zs5BZaxo0BRp41UO1PsOSYwfOqBnHOEHqFCLN3MJkPaYdybtFmOeWWXBlgj1+QRcEvFecvPhMbLR/eqAlcLrL7vbZt+668eBnqtaQyYb7BCEyq6TNzEms/i3HnsxVNtDZQPw9tDrKw+7LyrifNnuW+Q== 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: On 5/26/24 18:57, Byungchul Park wrote: ... > Plus, I will add another give-up at code changing the permission of vma > to writable. I suspect you have a much more general problem on your hands. Just tweaking the VFS or mmap() code likely isn't going to cut it. I guess we'll see what you come up with next, but this email was really just the result of Vlastimil and I chatting on IRC for five minutes about this set. It has absolutely not been tested nor reviewed enough. I hope the performance gains stick around once more of the bugs are gone.