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X-IronPort-AV: E=McAfee;i="6600,9927,10906"; a="392379444" X-IronPort-AV: E=Sophos;i="6.04,229,1695711600"; d="scan'208";a="392379444" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Nov 2023 18:36:50 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10906"; a="941426287" X-IronPort-AV: E=Sophos;i="6.04,229,1695711600"; d="scan'208";a="941426287" Received: from yhuang6-desk2.sh.intel.com (HELO yhuang6-desk2.ccr.corp.intel.com) ([10.238.208.55]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Nov 2023 18:36:47 -0800 From: "Huang, Ying" To: Michal Hocko Cc: Yosry Ahmed , Liu Shixin , Yu Zhao , Andrew Morton , Sachin Sant , Johannes Weiner , Kefeng Wang , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v10] mm: vmscan: try to reclaim swapcache pages if no swap space In-Reply-To: (Michal Hocko's message of "Fri, 24 Nov 2023 17:30:49 +0100") References: <20231121090624.1814733-1-liushixin2@huawei.com> <32fe518a-e962-14ae-badc-719390386db9@huawei.com> <87msv58068.fsf@yhuang6-desk2.ccr.corp.intel.com> Date: Mon, 27 Nov 2023 10:34:46 +0800 Message-ID: <87h6l77wl5.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: wuccigt5q59c9yywywjkw34m3y6eb8hd X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: AE7D640004 X-Rspam-User: X-HE-Tag: 1701052611-587353 X-HE-Meta: U2FsdGVkX18dasJZ8HRwHb5tx6281S0QrdYd0nap1N4P+iTyX2YDJEmzzbyjJR40KYyTIEGRImQ8iiFYIe5kBUTIO5Ym/osC2Azqiy6KP+MZkK0F6kLuW4qBmid58Pa5nKbt5RubPKzWtLfE3BXxmPZPw3glxjk4lfK9lQbE5S74jTl+4vfElK0A2aS2dKjwX9JIyByq4evkyeE8EEdH9S4tBFdoIOQwlb8qCrIVlXLJ4wCWo5JBz0+iAadjjKxSLd20GVPZQTvK2+FikfRUbpbcYsMa92K7M6NJUI+D35FDckAlNErz81RpUfQ/t54hoM84n0UyChbPqWGR1L1qdpiUUfjpv8oK7X97aMlUoghL3VEcsHw/yut7rgQGBf+yeOn4VuT18fFuJxA9Q2++1Taz6ABjiHumPOBFmiwTdlA/uY8gtzDw+XVYyw3b34cWb/Ffe4dWLjrPXu4Z+r20TotQ0CQ3ozTVE6M62zGRhRXuisv5msqL0IBHSh5oBT5MoJ0keanXGc0okEZvUKnnyzpd3nk2Sbs/+4cO2pyEyTwXS5C5iqcxc6Tx6Hk/WYNC5oye3Il2gMF4fr4hOboBy0RQorZiMXlrEQN+toDqUbIF3aWvGvgbD2lRUaJZDUJaByNfb9ZeGICASQARUIiNfmZOMEoYtKAi5HUEQ0NgXgwqeGgnQ5iZ75ESDFkVFP5CAoE/fMxpIH4fVmjI2XtpUDqV8XTlHSa9cl4Tjhcdk98s/TnLXL6kU+bf4GjQ9O0+MSSduH/Jd0FQhAKdivMldqXGeTT4cujhtiv6sDrIqQ4GQSthS8z308ejtjPG1goPM/HntmTzCN19aUoxmj7cT2dbrcsxHHbTEl14ZICPaYREbWwWCtOlk9h/yRVRXexuNJJNwx+DxHFH3rTQS1t9McVLw8NOJu3gGIGe/UCwQToum/OXxnTItfNM231qhfkshhtvMWYOlg8NV3fl72c s2RDHxeI aLmpYcPIoPCc4b0Wco/awZr830jWdBMl0GpoAhlFqAz1OBLLaCmFmdEvrfqmQKWX83PPcsPAKc9Fd6o4AKJCBdIft81zubu3LncCmIE+R2O5FMaPUDDFGuTROUp3HHaoBF8aYxGdKug2kca7bbj2ECo00Dg5ygoh0LNvsZyPv8/3YeDcxf8Hih45x4O0quvFyx0CFYlUeVY8YtFQ= 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: Michal Hocko writes: > On Thu 23-11-23 14:15:59, Huang, Ying wrote: >> Michal Hocko writes: > [...] >> > Yes swapcache pages are indeed more complicated but most of the time >> > they just go away as well, no? >> >> When we swapin a page, we will put it in swapcache too. And the page >> can be in that state for long time if there is more than 50% free space >> in the swap device. > > True, but why is that a problem? If you encounter such a swapped in page > on the file LRU then the page should be referened and as such should be > activated, no? This just means that anonymous pages in file LRU aren't temporary or short-term. So we need to consider that. For example, the original method to balance between anonymous pages and file pages need to be re-designed. The anonymous pages are considered hotter than file pages in general. -- Best Regards, Huang, Ying