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]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68069C83F1A for ; Thu, 17 Jul 2025 07:39:45 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E356A8D0003; Thu, 17 Jul 2025 03:39:44 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E0CE38D0001; Thu, 17 Jul 2025 03:39:44 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D49878D0003; Thu, 17 Jul 2025 03:39:44 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id C71BB8D0001 for ; Thu, 17 Jul 2025 03:39:44 -0400 (EDT) Received: from smtpin18.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 739B3110631 for ; Thu, 17 Jul 2025 07:39:44 +0000 (UTC) X-FDA: 83672957088.18.4A69A8A Received: from mail-wm1-f43.google.com (mail-wm1-f43.google.com [209.85.128.43]) by imf10.hostedemail.com (Postfix) with ESMTP id 7FBE9C0006 for ; Thu, 17 Jul 2025 07:39:42 +0000 (UTC) Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=suse.com header.s=google header.b=BHdIbmli; dmarc=pass (policy=quarantine) header.from=suse.com; spf=pass (imf10.hostedemail.com: domain of mhocko@suse.com designates 209.85.128.43 as permitted sender) smtp.mailfrom=mhocko@suse.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1752737982; 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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=vZrEPyAzZYbXLW4hzHIwK6WyS3z7Lh+pQWOnhcrXs9U=; b=oVkJKIikyXsPH4ZXwJd4Sc2BxK5C6YOzkJ0G+cYikQhlm8gecrgkN0S0cAbjV1Fh0KYTsu MTyOs35t/M4J4q13wuSThr+17j3cPMqiYd3libz8ns6ZDujsapWWbo3xcPMBN5jNUmmkTx R1btjTdZZ+a/z2UWCjuAuwDj+NTD/Bg= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1752737982; a=rsa-sha256; cv=none; b=RjHLFtC25AkVPbxIrmX2qFroxoyhfqZGZPHiMtU1rWYRdpyXi8/92oJxIt5wzLsVcyl117 T+Bvk+eaxw080hOUdoFYDtRpKNJNkoRyFFWlNYoRrNuGLpOX1wCWRsgyR6nF2S3OWQml/X R4RYy4nW5Mfkrt5d3K+MwVRjnBtQ968= ARC-Authentication-Results: i=1; imf10.hostedemail.com; dkim=pass header.d=suse.com header.s=google header.b=BHdIbmli; dmarc=pass (policy=quarantine) header.from=suse.com; spf=pass (imf10.hostedemail.com: domain of mhocko@suse.com designates 209.85.128.43 as permitted sender) smtp.mailfrom=mhocko@suse.com Received: by mail-wm1-f43.google.com with SMTP id 5b1f17b1804b1-455e6fb8057so6233095e9.3 for ; Thu, 17 Jul 2025 00:39:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1752737981; x=1753342781; darn=kvack.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=vZrEPyAzZYbXLW4hzHIwK6WyS3z7Lh+pQWOnhcrXs9U=; b=BHdIbmliZ+2jj8KOvizkX+hDo9LBc3uq/9cDWPGhaFBpKuxg7XAIR1iwYgc/eEh/QP 8ZjKl9D62FgVspt7YGl7yR2qLoHPFJpWbPLmXKjuxvZ+7N73CKzOGWtIwbsUfiFcYWIa kabIm2wPsAre8lTqgeaffjc7yjPN3SuJ1QhnHBR7YN5E8rhEeSjIkghqvze2mIJh9zVU dI5rlF/uu6bsd/FNc1j3ZRpGfTi5eP9NKXKwF83W7TxC+KhANv1pxQfxJqyYT9x+EH1n f1MNDaIyZXVObFUBR459HLvourk0E4Z6LQd8tvQFt5NDBXtdNuS2xcV6FxSIKPqvm3iX vt5A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1752737981; x=1753342781; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=vZrEPyAzZYbXLW4hzHIwK6WyS3z7Lh+pQWOnhcrXs9U=; b=UsudgshTTn5IlxPst6h91sNRXFmlCykd3Kadmq7Ll28z7yXsHTHhoM5+7mZnfEv/Fd Mc7dAd88XY1PIxIPHXibfAZ6eorvmMfuBSA3LWf0+5MsNcYw+d6064Byn7axIQiLFLpa BAOv1y+tlBe1xax4rG22LS1cKyXFVXfZBdlyLNqatKjTi9lCpx5h2AwMLnNWJfmp85S2 A7SJzp31xY5i80o6Q2yIxLA87mcpkS+Y4O+l1EJS6uvE87rawzaVKr/oQ0ZIfaU/3pC7 ZecGQDNO1DvabMNsttmtWOJm3EPYZ3179aMEnuq8hbgSFBlDaWUsKCiYVnapT6cZbRBb SJ8A== X-Forwarded-Encrypted: i=1; AJvYcCWQ6kopf+bvwyc4oXC14NMiT2x7XTpnBdEGQ4jS/+G68v2xGOco3wEAgG7J/LafztAEc3gV6o0dyA==@kvack.org X-Gm-Message-State: AOJu0YyxMSWwT5mAF5kHXBr3vEbGmyJZG69Ikgn49p21uMO/mn7LIItG psGSn8gwcT9x6ObKnWxauI9rm2x3DGZWEv+WxGvNutQ9hQaIe42Giy3vsxaX/cpmlZ0= X-Gm-Gg: ASbGnctNwkTroSUXnzDLTP7c4HhFrxAiF24rO1+4JapITe+gS6N02Q9S4renueJZ2yG 4dJKDkw7x1XHdqAbuQHIFyjXBqX8tKAHjKs/VG5/Njyh6tfBcW6H2pH4vz/U8pTExRFafUIDTLU 7+8CxkoMpvyYIG1+HngnkDEdH7biP9b4Nr4YJ4sIlbDVxsrtJHk65EODBy5s4RbudYHu6ipMsD+ Uc3olIO2BlBYuHM4afAlBQspg4VdPiAOmfwsRVSVQ4g0z8g7L1hYEXfGIXUNegbi4BPsQ3Ckkev scHxw0ICIX+lw6JnxGpQ4PzA+6ubDO9R7Lvd5ClRP2b+3BSCCA2vMinI85FpUwcOe8gdBt64yfA 7HLWRzcWseepsnSSn9+UTjeZ8m18+QafQ X-Google-Smtp-Source: AGHT+IFbX1qXFEm12UZgCtjQ6Ap8m0iXk0vzkenICIjnER7OgxzIO1RlyefnNXjs4zMt4Zi9EGbdFA== X-Received: by 2002:a5d:64e9:0:b0:3b5:e084:283b with SMTP id ffacd0b85a97d-3b60e4c1e2fmr4324167f8f.17.1752737980787; Thu, 17 Jul 2025 00:39:40 -0700 (PDT) Received: from localhost (109-81-27-43.rct.o2.cz. [109.81.27.43]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-4562e89c751sm41728305e9.31.2025.07.17.00.39.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Jul 2025 00:39:40 -0700 (PDT) Date: Thu, 17 Jul 2025 09:39:39 +0200 From: Michal Hocko To: Hillf Danton Cc: Davidlohr Bueso , akpm@linux-foundation.org, hannes@cmpxchg.org, Roman Gushchin , shakeel.butt@linux.dev, yosryahmed@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 4/4] mm: introduce per-node proactive reclaim interface Message-ID: References: <20250623185851.830632-1-dave@stgolabs.net> <20250623185851.830632-5-dave@stgolabs.net> <20250717064925.2304-1-hdanton@sina.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250717064925.2304-1-hdanton@sina.com> X-Rspamd-Queue-Id: 7FBE9C0006 X-Stat-Signature: zr9ms8yiwn7fxxfhig9kwm347tp7pdwm X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1752737982-31133 X-HE-Meta: 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 R5RKxBHD HPUJ1Vyp3sqjzCx73Ao3IP2qzy0MdBBHM3QhcBn24cVC6StPgbURn149aylaPRPiiOYRBBPxoVbZQM/0Aks0lE8VzkPuOBUg4fK87wcfL+tsmpqB0WoYZcN/6VcmEqrclXb+2KuS2m4EleIjCH0HyQ9mKZ/cFI/AJH6hNPX/VZk89m+6ha0ebEdmElaM+9MYbKuEc51rtGPPszwmtOjqlfZ9KKoQVxJomDE0UoQB2xVpOCPfJtCbTEB5IRP3Ur5iRyjFNSY17jNc0VmPygJanKawpSZI2KyiXSFig87jTyOYv6zCRzmpWnSZUk4jpHzzIdOLjppdhDzuzSIRw8CrJLrOv3FJPILISNtiy2xtDchsK3QcgckM0oZ6Rmw== 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 Thu 17-07-25 14:49:24, Hillf Danton wrote: > Davidlohr Bueso writes: > > > This adds support for allowing proactive reclaim in general on a > > NUMA system. A per-node interface extends support for beyond a > > memcg-specific interface, respecting the current semantics of > > memory.reclaim: respecting aging LRU and not supporting > > artificially triggering eviction on nodes belonging to non-bottom > > tiers. > > > > This patch allows userspace to do: > > > > echo "512M swappiness=10" > /sys/devices/system/node/nodeX/reclaim > > > When kswapd is active, this is not needed. > When kswapd is idle, why is this needed? Usecases are described in the section of the email you haven't quoted in your reply. -- Michal Hocko SUSE Labs