From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id ED4FCE9DE6C for ; Thu, 9 Apr 2026 08:55:19 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4791F6B0005; Thu, 9 Apr 2026 04:55:19 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 451616B0088; Thu, 9 Apr 2026 04:55:19 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 38DD46B008A; Thu, 9 Apr 2026 04:55:19 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 2888A6B0005 for ; Thu, 9 Apr 2026 04:55:19 -0400 (EDT) Received: from smtpin11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id CB4C2E2C4B for ; Thu, 9 Apr 2026 08:55:18 +0000 (UTC) X-FDA: 84638408316.11.774EDA8 Received: from canpmsgout02.his.huawei.com (canpmsgout02.his.huawei.com [113.46.200.217]) by imf01.hostedemail.com (Postfix) with ESMTP id C836240009 for ; Thu, 9 Apr 2026 08:55:12 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=huawei.com header.s=dkim header.b=ylb3kxaT; spf=pass (imf01.hostedemail.com: domain of wangkefeng.wang@huawei.com designates 113.46.200.217 as permitted sender) smtp.mailfrom=wangkefeng.wang@huawei.com; dmarc=pass (policy=quarantine) header.from=huawei.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1775724917; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=sdrsHSwCRgZ6uS9xoPl86hpy3G8uYrU07GQUvhHy4KY=; b=C+9YbfyKfhDUK0PKd7diijOGt3cwyf4BuT+BlyMUpyHmhRHIAlfRzVzrnF8G9azTHuGvzf TR2AGDrqdf237hE1kr7v5zqfyNeaNmrSBn+JoCluQUxYd/Ew/+Xlar1FePtx2PxqSoBZG2 PoPnp2LRB1MSdb92fgojw+Cfm4lU0Ks= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1775724917; a=rsa-sha256; cv=none; b=7Lihm0E2NBFhm/56oi3XINYDgQDgR9/x3FhaF8l6goeSoMGWQXd6grXrfNvrsE3vZb8hju 7Ks+cY6nAXRSWloZIRNhThz2YIPnSTjJZs2gQHq7zNXnglfaHLxouYCto5+PgX+zInIoKd qx1ZUb6MYcm8z4o75HKCZOVEDg42F+k= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=huawei.com header.s=dkim header.b=ylb3kxaT; spf=pass (imf01.hostedemail.com: domain of wangkefeng.wang@huawei.com designates 113.46.200.217 as permitted sender) smtp.mailfrom=wangkefeng.wang@huawei.com; dmarc=pass (policy=quarantine) header.from=huawei.com dkim-signature: v=1; a=rsa-sha256; d=huawei.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=From; bh=sdrsHSwCRgZ6uS9xoPl86hpy3G8uYrU07GQUvhHy4KY=; b=ylb3kxaTKjTEwhB2+nK78hg3owDGCr5AAKr964qMrhpr3j3fRZ4FgDYp/gvOMkCs2cFU/zJFd fpkpYgJaYUkLqU23EB1JNQq9V/jkH2xEfz8BzuQ/jxl7j9X8/c/rC8O3ug9NxVcSNTI2KP4B0bQ 863Z36N9tL+/AhR5MMHe/a8= Received: from mail.maildlp.com (unknown [172.19.162.144]) by canpmsgout02.his.huawei.com (SkyGuard) with ESMTPS id 4frtrM5hhgzcbNR; Thu, 9 Apr 2026 16:48:35 +0800 (CST) Received: from dggpemf100008.china.huawei.com (unknown [7.185.36.138]) by mail.maildlp.com (Postfix) with ESMTPS id E2A8E40538; Thu, 9 Apr 2026 16:54:54 +0800 (CST) Received: from [10.174.177.243] (10.174.177.243) by dggpemf100008.china.huawei.com (7.185.36.138) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Thu, 9 Apr 2026 16:54:53 +0800 Message-ID: Date: Thu, 9 Apr 2026 16:54:48 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC] fs: drop_caches: introduce per-node drop_caches interface To: Michal Hocko CC: Andrew Morton , David Hildenbrand , Christian Brauner , Alexander Viro , "Matthew Wilcox (Oracle)" , Jan Kara , "Liam R. Howlett" , Lorenzo Stoakes , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , , References: <20260409063503.3475420-1-wangkefeng.wang@huawei.com> Content-Language: en-US From: Kefeng Wang In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.177.243] X-ClientProxiedBy: kwepems200002.china.huawei.com (7.221.188.68) To dggpemf100008.china.huawei.com (7.185.36.138) X-Rspamd-Queue-Id: C836240009 X-Stat-Signature: x7bqm35r347g1esmddnzci171azxfrxu X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1775724912-317890 X-HE-Meta: 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 RUov9EIV 4PjIdD5mQqdqzSNdwCOOFI1BSPk7/zbExMH6UrcRwjApYsUg= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/9/2026 4:22 PM, Michal Hocko wrote: > On Thu 09-04-26 16:08:37, Kefeng Wang wrote: > [...] >> To use the reclaim interface, there are two differences, >> >> 1) we need to input the reclaim numbers and swappiness, this is not a big >> problem >> 2) for reclaim, it supports swappiness=max to only reclaim anonymous pages, >> but cannot only reclaim file pages, > > Why is 2) a real constrain? This should not be a restriction, but a strategy. Our product wants to migrate anonymous pages to the local instead of swapping them out. However, the current per-node-reclaim interface does not support reclaiming only file pages.