From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f178.google.com (mail-pf1-f178.google.com [209.85.210.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EC4AE3370EC for ; Tue, 28 Jul 2026 15:59:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785254356; cv=none; b=cbPXFIsxWHTd7AAsnEsZvyJTs5qEx0pHlenrTfsRCggMNqnscJQXnsN6vabV10cHN6Uh7uG45VOD7zJNefP1KG3t45ncTTl3AZLpTKzuGfJCSOX4U0eWfuuOrFfJdXKV6Vqe9PTx9f9+UJDoz6e43gMWKubGEIUrs22107l6RVQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785254356; c=relaxed/simple; bh=ohrQ4/5NhZbTe/0BfeMe9Sa8VQZAUzq38MARtFIRUag=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=GpwPNpUQu9Bu5eWPpBUAQPtT3SPxaaGyjr4koa9qDkbN2IYZgFsLukqi0MezbErIO+2pTym8X7M527Kaf+kj7zggRTJwkYvF9L3C5j1pItZOs7F00XZYCfoFVD5jdlRdQM8ekM86vUaOuJcErhZXwW1kMNtIlms1YZgBPjEmQ6I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=iGkbXt9m; arc=none smtp.client-ip=209.85.210.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="iGkbXt9m" Received: by mail-pf1-f178.google.com with SMTP id d2e1a72fcca58-84536ecfc5bso4712063b3a.2 for ; Tue, 28 Jul 2026 08:59:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1785254354; x=1785859154; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to:content-type; bh=ZyPtbojkew6N2Mpwl2cc8VXMxEGAS6GjV720XpOTZzA=; b=iGkbXt9moscFkt0WzzFv/7WnpI5mKaUxa/q5vvmb8opwZ3TIZtsku9eEroYUPAnHRm fv3u/2D/8jP5s2d1mJxcUvFPkj/UmyvxAb9krMaj5MqRtIKsT+pVwlp7HU41Ga9pGnXk kV5jLegUE63H20eKuxsFabwcLllTgFpImcEeSHUi4EFTYM5qOzJazHiZ5RtNLIrW9YWn IJt4g7DyZY6I2RXFCBVRszc/aYOrU/ZeeBOdCimB7U3THfpH//gVINOoeXF5MDLbUwOF 39o8aNoaWfK8boFEnUPHhcMxnhg7duLHPOBeygfMmrndMKu83+2MzVqa763mlGFxYYq5 Gt+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785254354; x=1785859154; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=ZyPtbojkew6N2Mpwl2cc8VXMxEGAS6GjV720XpOTZzA=; b=leZErcq13h151AXaK5CE9R4KJIUJHqps+qGQWr81rdo0NUPgblovtaRBfrNOnexrUR AucbkyFnCqK3ctyHrresDsKLCAFKY63FFtvBMaToRavywjJT4b7+bCxdwpQHrAWF7UeV 5STjFZFo1wbNsBn6yvSqJ6/K8m42pvlCAfcJQKo0vxXBPf0IOEP/93NxvAGaufkP6M+6 OZGRPvqVKqksjxyH3JAc0LD7TJCDZIO0es2jZLpaVTmUJiWrqJ0N9CnxYhqny6DkNokT 8vxSlyXZALbqDcxVM3PrbE7FbTxUB8muY81xCrewI/hN0uyJYLofzEDvm958Yyw9+LkW L4kw== X-Forwarded-Encrypted: i=1; AHgh+RpjEqz6tfRLbZhMp2aWl8gYzWSGqQhsYMW7UX8fNdEn5Y1ONlcxOJOFyRBUBH0TqAxGtRtL46u8pk8heKQ=@vger.kernel.org X-Gm-Message-State: AOJu0Yx3RRzne6RKcvzRGRnmnfHGFrDCpBz9/PMWeGmrk4S5L6hTv86E 54MLRFwRDGEMyfM9vuKthCcl5M9eFC7yBfwqdCiqCDsHljVZF/yiq7f0 X-Gm-Gg: AR+sD117sWOwOsysMw5KSTYXJmRHFL2v9kxDFmKyScaXMOuFnT/Swy7hKkjni/eNF3L KdyT8ZJKJw9qwzVNGQ9QOwoSvzn5RIxpxkUSL3GbXaoOmNO55EJ2IFsGcOUM7/OoekdWfd8gN1z kAKFGVxqy5/k0yuU+fL2vLmMKY/i/td/U0ZANMLR2H4HRl3l+koayKnpEob8U9oYyni9NiSD6YA 68J0kLa28X23t0nzsq9CWPBdo6Yru33ktVF+VSAtW8m0AXqpZCYkfpyPVeDThY8qiLa1n3clUdM DhtEsLJm7x7RegTiqEq0InkWJ0jmj5kN1k4mn5SL5QEJr//v/rc4fEA9NThTehuT54mzA7kjVok 6HAcuVMER879T79AmW/0Y0sz3pYdnCei/XjyRFiiN+Zihmx6ZquyHAB3UzMKZYCZY4t+yKtMN+/ cunGl71FiGRSJdI96M+2XN/vJ3Iz1h5qRoe8DBINTXoY5XZ0f4LouH4PW1E8hvVUI= X-Received: by 2002:a05:6a00:189b:b0:841:dca1:8b69 with SMTP id d2e1a72fcca58-84e93196934mr3246661b3a.5.1785254354266; Tue, 28 Jul 2026 08:59:14 -0700 (PDT) Received: from localhost.localdomain ([220.85.166.190]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84e9fe2393csm156441b3a.10.2026.07.28.08.59.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Jul 2026 08:59:13 -0700 (PDT) From: Youngjun Park X-Google-Original-From: Youngjun Park To: Andrew Morton Cc: Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Youngjun Park , her0gyugyu@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 0/2] mm/swap: skip empty clusters in the swapoff scan Date: Wed, 29 Jul 2026 00:59:05 +0900 Message-ID: <20260728155907.391820-1-youngjun.park@lge.com> X-Mailer: git-send-email 2.48.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Youngjun Park find_next_to_unuse() walks a swap device one offset at a time. Slot state now lives in a per cluster swap table, so patch 2 dismisses an empty cluster with one counter read instead of SWAPFILE_CLUSTER table reads. Patch 1 is an unrelated one line comment fix noticed on the way. A counter in the skip branch confirmed it runs, and swapoff completed with the device under load. No DEBUG_VM or lockdep splats. Youngjun Park (2): mm/swap: fix stale comment on swap_info_struct::cluster_info mm/swap: scan by cluster in find_next_to_unuse() include/linux/swap.h | 2 +- mm/swapfile.c | 39 ++++++++++++++++++++++++++------------- 2 files changed, 27 insertions(+), 14 deletions(-) base-commit: 2a4faffc103297c4822bb269d521249b75cc2261 -- 2.48.1