From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qv1-f68.google.com (mail-qv1-f68.google.com [209.85.219.68]) (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 7696E2BDC03 for ; Wed, 17 Dec 2025 19:59:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.68 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766001566; cv=none; b=gPCbh5zt0WwpcKB8ZSFTbADSX1cIW4N0TQeEm4wWt/T+iVlMXNzhXOAAOQ2AqISYh4fzfipSWW4nvtIp+mQH+1qKP/63W+D9RfcinuGBnXd5PmrH1BIEiCPLO6BP79lcV4dLapQrEEDinct8QHtwQcjgzQsTAYZXaW0upSv3CGE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766001566; c=relaxed/simple; bh=V+ryZgpse65jdzL7I3bov4UY3kdKSBHonGILf/gWTI8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=A+/7lDx+Pt3EmXSsuJv1LmJpw6G9KrYlZaZUKb0QRDLxxhmbVm7ak102dUwBtee/Ck9o4jfPRcl5q+NFmTUgl8wqtVjyBgLdEdqD3WoZ+oZ1u77bgNptSvF/KQ+3IXeWi2BqYW0c1xxYu8UpjBvA8FGLZ4xQbE1fl45j3mHHjLM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=cmpxchg.org; spf=pass smtp.mailfrom=cmpxchg.org; dkim=pass (2048-bit key) header.d=cmpxchg.org header.i=@cmpxchg.org header.b=ul4cBGQs; arc=none smtp.client-ip=209.85.219.68 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=cmpxchg.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=cmpxchg.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=cmpxchg.org header.i=@cmpxchg.org header.b="ul4cBGQs" Received: by mail-qv1-f68.google.com with SMTP id 6a1803df08f44-8888546d570so38805776d6.2 for ; Wed, 17 Dec 2025 11:59:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cmpxchg.org; s=google; t=1766001562; x=1766606362; darn=vger.kernel.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=umJwQRcOcv6tN8KQ+xKY+ct7qymfOOSndzlF6qrQs+M=; b=ul4cBGQstaGS7tdthuKYGL3gMPgmPggsCaJsgF8WFAYeqAgtwvJ8ek17C3wJMeP08U FDeZ3wd12ijYej7nQMq6w8RUPt3n9ZPp1RQiIP+FYOmgwFvBnVKAGI2icuKq4ou136T8 /kHRJO+U/Ao3MqJojitE0Oe+7l7ISe+f/V8HVtWgd7FoQyLJhmyYAfaIx8efXX/RNFLS XTRlc20MiR6nbXgflMbRSLNDXLC3y7bH4GErvdg5E5Gi/XJI4qDmBvjWfaSH82dpmfXE XpwmNjWIBiYwpwhCS3YVcBEwCc79zOodOrQgzllZTkr+CXmDyNF3t37pKw6XF01BRKaI iKfQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1766001562; x=1766606362; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=umJwQRcOcv6tN8KQ+xKY+ct7qymfOOSndzlF6qrQs+M=; b=e9R1u+68yA0mmsHxxBjCEOyxEOHGyMnFR0x+PQvym86GJ1rcdUKJ8T7QxcU/RZ4l8L P8cYPzbGeXU+AttPrXRWMNnapyctG+OrjueO8Ap3sdACcJxc3YjsOZ+tt8Qm+JOgx/jQ 20uEhmv2cHZSWlRLKltcMmqNnhCIsQDG2+0KEEbnKCBvPkz6otE3Fn/XnfQ2520rBj+i bq7PIJrbZsIhyvMqaSsjLXExwsFPiWZezQx09jXDRK44Y8oNEgrgT1YRcEo44dMZ0oGf mDwQfynqU9HVlvv94fFc3XQbGCl9jpzeLkSKtbRBKJTa2Rm+3HCdIysSadp12zbQpM2t ZCcw== X-Forwarded-Encrypted: i=1; AJvYcCUeWWIUVMk96hCqWRWOnirdOKzXfOVUxfdNKfNonolnWR8Q41vcDY+YxH8u3hrrnwnkJ9PbdDKKjPFnkxE=@vger.kernel.org X-Gm-Message-State: AOJu0YyqIYAWzCxCuLqqShk/ezhXiDnKZK+quirWCF9PFhyzSw6YKhHO pHizNqTehMnFj9zhVqIvgXGxfCwMV+gtbXufBltKEzjB1/cxcvDcunFKnNWb6sgI0Go= X-Gm-Gg: AY/fxX5P2MyPjidnv4PC1XRj4uNltYK3LBUwOj9VqnCOpK1/hB1hA4bPFpF1/yqkXoA I15FlaFTEVhgr18TMcZfu/UD4wUqXYxFE9nmaZWS70hVE49APyb86mBBGXNRlDol5f/+dsuNxeo Wkcq/4sdi+FRvQPRYA9eNoPrXmImPXV65kG2J67PJAMa2tuoxoboyrk1rBmfEeoERkemqJSsUT0 x05u2kFCmUvpMlrc0NPoxHu3NsWgMwN3Ih7Oo6D9InhxLRLCM+kd32LoPO6/gKJ3j+zsDR/qJjM 2JG5OuTs4BTzEyWwGAAsMmazX9DhGVVJObdLnK36aJfAKnLIrvVgh354a+g3eJeQ7rnjY52SE8z 9ZGsTqNYkbNuD4F0+RSi1/bcFJb+YpTnyUjlDDEJzXWbU526k98JEkcIeu2EVV7/HfnwmxPPFfL WSsbStAyYyBE3Ik4MXsPT9 X-Google-Smtp-Source: AGHT+IGkgd14mqGKPn7evzONaa5NlqMwbBZNXipPmIuU2TNCHRjQ90/wuY54LLEAOA2jYshzbetrvA== X-Received: by 2002:a05:6214:5b8a:b0:87c:1ec5:8428 with SMTP id 6a1803df08f44-8887e127b6fmr309717816d6.46.1766001562229; Wed, 17 Dec 2025 11:59:22 -0800 (PST) Received: from localhost ([2603:7000:c01:2716:929a:4aff:fe16:c778]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-88c61674467sm2152596d6.55.2025.12.17.11.59.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Dec 2025 11:59:21 -0800 (PST) Date: Wed, 17 Dec 2025 14:59:20 -0500 From: Johannes Weiner To: Shakeel Butt Cc: Christoph Hellwig , Jens Axboe , Deepanshu Kartikey , akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org Subject: Re: retiring laptop_mode? was Re: [PATCH] mm: vmscan: always allow writeback during memcg reclaim Message-ID: References: <20251213083639.364539-1-kartikey406@gmail.com> <20251215041200.GB905277@cmpxchg.org> <20251215200838.GC905277@cmpxchg.org> <20251216185201.GH905277@cmpxchg.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Dec 16, 2025 at 03:23:53PM -0800, Shakeel Butt wrote: > On Tue, Dec 16, 2025 at 01:52:01PM -0500, Johannes Weiner wrote: > Reviewed-by: Shakeel Butt Thanks! > > --- a/include/uapi/linux/sysctl.h > > +++ b/include/uapi/linux/sysctl.h > > @@ -183,7 +183,7 @@ enum > > VM_LOWMEM_RESERVE_RATIO=20,/* reservation ratio for lower memory zones */ > > VM_MIN_FREE_KBYTES=21, /* Minimum free kilobytes to maintain */ > > VM_MAX_MAP_COUNT=22, /* int: Maximum number of mmaps/address-space */ > > - VM_LAPTOP_MODE=23, /* vm laptop mode */ > > + > > There are 8 earlier enums here with names like VM_UNUSED* along with > the information on what were they. Should we have something similar for > this one? Something like: > > VM_UNUSED10=23, /* was vm laptop mode */ The other enums in that file leave holes, the VM ones have a mix of VM_UNUSED and holes. I don't think it matters either way since the sysctl syscall has been removed and nothing new should be compiled against the definitions in this file, right?