From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 2001C62A14; Tue, 13 Feb 2024 22:05:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707861948; cv=none; b=tLllnxk/OUppZBsDdS863ssU1jPjhgolSBTh1+shLz49GUD6yYMM2S/1zPTaz3nCJLchs6t/FIhLgx3sxtTLkh7bWt0rFWVOhH+J3VWw0vLjn/a8Hq68louQZ0/pt//xQFD6gBqmLFL1lFHpTH61IRdS6SfLj/BAosSqlJ5BxSg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707861948; c=relaxed/simple; bh=DppRKrPmqw+3GKjCJBp1hknt3cyP9HMEeCzes6f3UmU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=tRO9gXCXpLJlM1p0qaHiLzIY94I4qzSvmLngAFr5yNmkmkxpdPR9gJsy54YHFRmkstdgHOTuTA6hE1xyrGk78lsIYo5VUqmgO+dSMzdX9rnkRfkq6/c13gM0SxUe+ybieR4f5N5eifijFbA6npp34jagSBnvxwfrXgkyxJdcGGM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=CPQtwNPy; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="CPQtwNPy" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=JadPxG6WJhYUcvS6+IGeTjuA2qbpxxQZu/A1yx9oNs0=; b=CPQtwNPysUDgngBInSv6kmWZWN XjjxOCdU1RnMmnRTFinL1qVF0bVOMeUBB4THmC07L+mOS/XUH9oxBsZ5w7w0m45kVwz+oCC6ndU1e /8iHvlTqC0srnYNWT7WwqjKN683FnVWvUhHo6tUcXQkrBhQOtmvH2T+PZxm+oEKueUq88Ql6lFEPl KAwtbarvdKhop40jlDZYgmOHik9KeoHRVfCjg4Ppc0rXdsHGH9m+XwEqBn8GVQ/CaCFLqvxtPNz5z lMj03Q6Du7jkFhIbr3GdTUjgY8T213sBU9bUySaEBb88FimyLZUiwrUBc7XLuYm6bfNwpD7BfYaDz VwjAzbww==; Received: from mcgrof by bombadil.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1ra0uJ-0000000Aypi-13wd; Tue, 13 Feb 2024 22:05:39 +0000 Date: Tue, 13 Feb 2024 14:05:39 -0800 From: Luis Chamberlain To: Zi Yan Cc: "Pankaj Raghav (Samsung)" , linux-mm@kvack.org, "Matthew Wilcox (Oracle)" , David Hildenbrand , Yang Shi , Yu Zhao , "Kirill A . Shutemov" , Ryan Roberts , Michal =?iso-8859-1?Q?Koutn=FD?= , Roman Gushchin , Zach O'Keefe , Hugh Dickins , Andrew Morton , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH v4 5/7] mm: thp: split huge page to any lower order pages (except order-1). Message-ID: References: <20240213215520.1048625-1-zi.yan@sent.com> <20240213215520.1048625-6-zi.yan@sent.com> Precedence: bulk X-Mailing-List: linux-fsdevel@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: <20240213215520.1048625-6-zi.yan@sent.com> Sender: Luis Chamberlain On Tue, Feb 13, 2024 at 04:55:18PM -0500, Zi Yan wrote: > From: Zi Yan > Order-1 folio is not supported because _deferred_list, which is used by > partially mapped folios, is stored in subpage 2 and an order-1 folio only > has subpage 0 and 1. The LBS patches has the patch from Matthew which enables and allowed us to successfully test order 1. So this restriction could be dropped if that gets merged. Luis