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X-CSE-ConnectionGUID: 2u8bFr89RFy9ujwRWmlhIw== X-CSE-MsgGUID: w0Ruyv1uTLOg5DgGE9wGCA== X-IronPort-AV: E=McAfee;i="6700,10204,11179"; a="34796292" X-IronPort-AV: E=Sophos;i="6.10,188,1719903600"; d="scan'208";a="34796292" Received: from fmviesa010.fm.intel.com ([10.60.135.150]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Aug 2024 00:57:04 -0700 X-CSE-ConnectionGUID: hOym2mxlTm6JTAiHi6VU+Q== X-CSE-MsgGUID: TzTDP3QASsGnATZ61G8kkQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,188,1719903600"; d="scan'208";a="64013392" Received: from yhuang6-desk2.sh.intel.com (HELO yhuang6-desk2.ccr.corp.intel.com) ([10.238.208.55]) by fmviesa010-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Aug 2024 00:57:01 -0700 From: "Huang, Ying" To: Wupeng Ma Cc: , , , , , , , Subject: Re: [PATCH] mm, proc: collect percpu free pages into the free pages In-Reply-To: <20240830014453.3070909-1-mawupeng1@huawei.com> (Wupeng Ma's message of "Fri, 30 Aug 2024 09:44:53 +0800") References: <20240830014453.3070909-1-mawupeng1@huawei.com> Date: Fri, 30 Aug 2024 15:53:28 +0800 Message-ID: <87a5guh2fb.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-Stat-Signature: zjrj8i5bgp1xpcwaocjc3u8uz714ffaj X-Rspamd-Queue-Id: 2C9DD100014 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1725004624-997256 X-HE-Meta: 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 5b2O6f3w Q+JfWPOeFD8zC07x0fiP4XAWZEGSofW+Tqej2xsOaZ4YAlQ/ux+qliLVJcN/hp12Y8Hnm9ALJ/Qfw0/VYDdQ3oCFXp87jCL7O6+C6R+66vcyBtcKL25fgilOYcZdwPMcL8XqQ2oQtwiI2tTZ1H+qcS3NIHidTuwU+PViqoxQ7EVJg56Tz5aj/2gtEUcKy+LjUUKXyn+ZNjM7cpCkrOwm/am97KQ== 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: Hi, Wupeng, Wupeng Ma writes: > From: Ma Wupeng > > The introduction of Per-CPU-Pageset (PCP) per zone aims to enhance the > performance of the page allocator by enabling page allocation without > requiring the zone lock. This kind of memory is free memory however is > not included in Memfree or MemAvailable. > > With the support of higt-order pcp and pcp auto-tuning, the size of the > pages in this list has become a matter of concern due to the following > patches: > > 1. Introduction of Order 1~3 and PMD level PCP in commit 44042b449872 > ("mm/page_alloc: allow high-order pages to be stored on the per-cpu > lists"). > 2. Introduction of PCP auto-tuning in commit 90b41691b988 ("mm: add > framework for PCP high auto-tuning"). With PCP auto-tuning, the idle pages in PCP will be freed to buddy after some time (may be as long as tens seconds in some cases). > Which lead to the total amount of the pcp can not be ignored just after > booting without any real tasks for as the result show below: > > w/o patch with patch diff diff/total > MemTotal: 525424652 kB 525424652 kB 0 kB 0% > MemFree: 517030396 kB 520134136 kB 3103740 kB 0.6% > MemAvailable: 515837152 kB 518941080 kB 3103928 kB 0.6% > > On a machine with 16 zones and 600+ CPUs, prior to these commits, the PCP > list contained 274368 pages (1097M) immediately after booting. In the > mainline, this number has increased to 3003M, marking a 173% increase. > > Since available memory is used by numerous services to determine memory > pressure. A substantial PCP memory volume leads to an inaccurate estimation > of available memory size, significantly impacting the service logic. > > Remove the useless CONFIG_HIGMEM in si_meminfo_node since it will always > false in is_highmem_idx if config is not enabled. > > Signed-off-by: Ma Wupeng > Signed-off-by: Liu Shixin This has been discussed before in the thread of the previous version, better to refer to it and summarize it. [1] https://lore.kernel.org/linux-mm/YwSGqtEICW5AlhWr@dhcp22.suse.cz/ -- Best Regards, Huang, Ying