From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6F8C63538B3
	for <linux-kernel@vger.kernel.org>; Fri, 21 Nov 2025 18:03:46 +0000 (UTC)
Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201
ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;
	t=1763748226; cv=none; b=buYJtx3hmkO0wDwbiX87rYJzihLk/V9WGbStPobvTJFDMgOi7hhBXtmmPaq/xhdvaxHeZQkwmXzD5w8jwXcWQe9x4HZ4KwuWkxpKkne18DlqdXNCORkIQ53IG+d8KeNq3s2qocrKDeKfbj4+HhtLpWbMqtknSnKJtDqWT0PbWz8=
ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org;
	s=arc-20240116; t=1763748226; c=relaxed/simple;
	bh=2KHDvGRFx1nvx1KKxzOyRySXNWpSsia1GYIFIFRFikY=;
	h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version:
	 Content-Type:Content-Disposition:In-Reply-To; b=ev5m4uT8HlQ168qrHheuhTQKtLoOfrg5J7nXeWemO7naZZydSp9h0tRP0rncIaWzmro33MZu3TNsLErsCFR7viHQ3k4BHluhOnMyiWIH0y/3sqHahGoRkxJtFVAhpeDZFgvcjk7gzaTboZMjEHtQeNI6Wt+Y9s9r/kBtnN05X+Y=
ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=q5UsYSw4; arc=none smtp.client-ip=10.30.226.201
Authentication-Results: smtp.subspace.kernel.org;
	dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="q5UsYSw4"
Received: by smtp.kernel.org (Postfix) with ESMTPSA id E3109C4CEF1;
	Fri, 21 Nov 2025 18:03:45 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;
	s=k20201202; t=1763748226;
	bh=2KHDvGRFx1nvx1KKxzOyRySXNWpSsia1GYIFIFRFikY=;
	h=Date:From:To:Cc:Subject:References:In-Reply-To:From;
	b=q5UsYSw4M1gb0s6Ql3jFMq3QnL/p8LDGHG7NTwaiSd8vvD/itXu7rdTcIyIKpguQM
	 bGxsPYOkrCI+c07Mi/mLFHy+Nad5/G58f6t5DIrEBfz3JtRIq/omY1qNzyItoeYH5t
	 OimlBg+85ynwWIZBtgak9mLmYWfV9oYhFlVRNZPiS8AiCk7UbE1i5PiIz30NRdXrgZ
	 bg1DTJ4ZVDKpCjyImphse5QZSgUec6d6j1+8TARN8B6A6Aaxq7jW6RuEpZkGGUC0Rn
	 Io7bJpa3XYUGcII/bw5LnS58bpBcMo1KgA2LjtI2FGT7gsfNLad61D03swBkNAWoyI
	 IbXsUcQjG1+tQ==
Date: Fri, 21 Nov 2025 18:03:44 +0000
From: Jaegeuk Kim <jaegeuk@kernel.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net,
	David Hildenbrand <david@redhat.com>
Subject: Re: [PATCH] mm/readahead: add a desired folio order for readhead
Message-ID: <aSCpgMvrvA_hR4VB@google.com>
References: <20251121014811.1971698-1-jaegeuk@kernel.org>
 <aSB3kcsneAS94DgU@casper.infradead.org>
Precedence: bulk
X-Mailing-List: linux-kernel@vger.kernel.org
List-Id: <linux-kernel.vger.kernel.org>
List-Subscribe: <mailto:linux-kernel+subscribe@vger.kernel.org>
List-Unsubscribe: <mailto:linux-kernel+unsubscribe@vger.kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <aSB3kcsneAS94DgU@casper.infradead.org>

On 11/21, Matthew Wilcox wrote:
> On Fri, Nov 21, 2025 at 01:48:11AM +0000, Jaegeuk Kim wrote:
> > This patch adds a desired folio order in file_ra_state in order to get
> > non-zero-order allocation for readahead.
> 
> Why?  Does it not ramp up quickly enough for you?
> 
> I see a lot of patches from you that say what the patch does but very
> little about why.  Please explain yourself more.

Yeah, let me revisit the patches and post another version that uplifts
code into mm/fs with what I'm trying to address.