From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=91.218.175.12 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792447596; b=YukZeae0N0Uj/jG3Oe7c1AXKaKwAP5vTjePuszJpO0Y1bRHAqkLJlRos0JF/X4wQJnVa 83xCxFQuejjffWGFbRJZxUXQ/IYAjlYZxOUjXDkGDilfqgxnqi4pgbYCZzxBBanaQZIrk se/86x7TcpNphUVa1eeKKg0z6IR+NucUmnrOcq66DTw2aDFGsUaZCSSuuApJHQRaOnf/f Pp7O+m6OQr3Evi40hqMyVTzyz1hbIxfnO277dAoZfYwtOq0P/fRLWINfLrmsrNGt1oahB TKhxyptXp75Zd6yGQtWEnLVnVT5+Kz4T8FJux1fTL82oLYhCea22g7/fpDa4TjNE+mQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792447596; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=wIBD55LUoHoDATJCGVof+4CgALz8EVmNkMYBhtvyd6Q=; b=aHY+Pi7+GiY9iiJ7QLrcIBDg3sN7A4M58lEgS8Skp0A4jfOETVYmYxwKr/wkHZO2VMOT w8uCAtYJUOjxsdY0hKDQLUD1gJ7D/JocU2tobCh64DC0vhZhv/yeR9XPZlvqFNZ/mFsj/ Z195Z88uTwEB19JDM0015E9IWFmmlGm0mWGO48j9TsbeaN0A6ya5jDBUEAMU9vhokCxRQ RifrqzskPdx4fgj4a96iXkA29pClVSOguuTNFMLgvCvqn13LJnvX9GcMLoJ4Mzv4RyIuy iyOnGbSZj7g2gM5Y2yCJx9Ak/KA+mlaXfO0R4WPouQY26qtamr950Cik3dBXCuBUUng== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; arc=none smtp.remote-ip=91.218.175.12 Received: from mta0.migadu.com (out-12.mta0.migadu.com [91.218.175.12]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 672D8606A319 for ; Mon, 19 Oct 2026 22:06:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 672D8606A319 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=GhC0senqgW9jk2iZrX/Oeif4+RMjrpYmvR16vIm3Y84=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1792447592; v=1; x=1793052392; b=RGd1WEcy6qUGkInqsO6UQsWxpSvK+GCUSBAFheBJNPOMDkx2Wm6h3ooFMF3h2XC9eBo1/JXS mGwIUxbHAIB1I8DpG2ajAUb0Kc/0FxArxX1xbPeubnS+lc1j6hxvD5faGh3cgPyTEupWpX3uNsc Z8FyFfQficBtcqQvYNYy4FcQ= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id c4935393cb2a0c10; Mon, 19 Oct 2026 22:06:32 +0000 X-Mizu-Trace-ID: c4935393cb2a0c10 X-Migadu-Flow: FLOW_OUT Date: Mon, 19 Oct 2026 15:06:29 -0700 From: Shakeel Butt To: "Gregory Price (Meta)" Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, akpm@linux-foundation.org, kasong@tencent.com, qi.zheng@linux.dev, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, baoquan.he@linux.dev, baolin.wang@linux.alibaba.com, hannes@cmpxchg.org, david@kernel.org, mhocko@kernel.org, ljs@kernel.org, dave@stgolabs.net, roman.gushchin@linux.dev, stable@vger.kernel.org Subject: Re: [PATCH] mm/vmscan: reclaim every zone in per-node proactive reclaim Message-ID: References: <20261019185002.3428594-1-gourry@gourry.net> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261019185002.3428594-1-gourry@gourry.net> On Mon, Oct 19, 2026 at 02:50:02PM -0400, Gregory Price (Meta) wrote: > user_proactive_reclaim() limits per-node reclaim to > gfp_zone(GFP_KERNEL), which is ZONE_NORMAL. Proactive reclaim serves no > allocation, but that limit makes shrink_node() skip every ZONE_MOVABLE > folio, so writing to /sys/devices/system/node/nodeN/reclaim never > reclaims a node's movable memory. A movable-only node, such as dax/kmem > or hotplugged memory onlined movable, reclaims nothing and fails with > -EAGAIN. > > To reproduce, fill a movable-only node with clean page cache and write > 200M to its nodeN/reclaim: the write fails with -EAGAIN and the page > cache stays. The same write to a ZONE_NORMAL node frees 200MB. > > Scan every zone, as memory.reclaim does. > > Fixes: b980077899ea4 ("mm: introduce per-node proactive reclaim interface") > Cc: stable@vger.kernel.org > Signed-off-by: Gregory Price (Meta) Acked-by: Shakeel Butt