From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.148 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792447596; b=qQq0gxaxyuv2taosQwA5o7umhJJLRrm7VkX8Qg5W1sNG/BN9b4TqZ2h9lpzsk+IrAdXU m/exLMzzlwEHbxVzejSVZ4pDKFijrR5KWkiLIkUAbupVZIcqgPqoS/1zzLO82nTHipI4n 7sTN6JBpfOWQbpuwsSjIOHRSBufLHWKSHb9P9zx2G7hg4IbJOVjL20b63INY/GAlIndBV 9Ieg3EollEoUNmeTR6EpBzy7CI5hdwk8QRYmIJiLzLOY6IQki2gM15X1lSIDk18Q2fPht B2zZxolRwhsf4hhB5y6RBQfIGx9Rj+MqGN9dUmdfEwSbF8zv/Lq8Y0eBxJEbuCBiE4Q== 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=k4368siIxN1PnGnRu8UzPUPxxPe+ArmX+NlNSzdjoppjZdQKobYJ2TPdnnx5lcysI6zv mHSlTn1o3Vi0+iYd5tlAU9SR9SCvtdqLAJnyCLK0FYc48V4P1+9Bkm9eXqAuD1pwZUW/N o4i55N0alWpvIcxb65wTnCuMeQliIjpNFx5svZIUG29sppaxlZ/qLJG6SKgqQHakq8zPj 2L7kJ4MP79PrtUk2qIcual3vEBZvBJuHfOM8MADGwlCr0vQ9uRq13KabovdmgR2PI04kH /XM3S50ArgFjOnRcDgJ6f+ZKPpr4zCYRFvsIucQ8hQ2LlxgkbnVPVhm2N/qlL5xQHsg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=RGd1WEcy; arc=none smtp.remote-ip=95.215.58.148 Received: from mta1.migadu.com (out-148.mta1.migadu.com [95.215.58.148]) (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 8E633606A31A for ; Mon, 19 Oct 2026 22:06:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 8E633606A31A 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 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=RGd1WEcy X-Envelope-To: stable@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: stable@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: stable@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