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 0FC2B263898 for ; Wed, 19 Feb 2025 23:52:13 +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=1740009134; cv=none; b=LHqscHkBzFrMZcQQLwJFB5V/w8/KGYplS8sr/+x87AYWgWZwaj7AjQILIOVYG+qPbb/73nxD8rsx4rxbd9PweVmjWZuP5VuT6wNRGvk00enaKPYh6GFXoGa3NZI2EKKGntLRwOqFx4ijEW1yCewGn6i6/Q6kqfK4yD/hMNDwl48= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740009134; c=relaxed/simple; bh=LRzEFwyIrBQ74JDs/gdiaH0OrhDUHunRPLF7kmwnS6o=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=IlIz9a2Jf1yV/Hjhc8ZVBls9k2rV787YVa7Pzgc103XRgVewquLzhA+j0FBIsHTDYrZnCgqewHUN6GH/rx2Hfii1pQKZFqJKZGpJ0hY3Se4RtqogcyXU5x7sCPxlbXE/aeUE+LrkDIyN9rR3hCoBXy37nIB7TXjIP2FtY/rX5sI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=wzQff/eO; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="wzQff/eO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74547C4CEE0; Wed, 19 Feb 2025 23:52:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1740009133; bh=LRzEFwyIrBQ74JDs/gdiaH0OrhDUHunRPLF7kmwnS6o=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=wzQff/eOT+u+AtG0ZT7G/dp+QoLv+4GFH94A5lV3pU0eEqGgk8EvbQRAOGvEVTd4I mfQDv4TisX/2jopNlzVHMN/2BjVh+CnmXeS4Rz+/E7qk547VHFMs0RSvknkpFmbtYw keHCHB/Jw+T0Zqp2c/lIb96W47aiPk3Eu49oXr2E= Date: Wed, 19 Feb 2025 15:52:12 -0800 From: Andrew Morton To: Luiz Capitulino Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, david@redhat.com, yuzhao@google.com, pasha.tatashin@soleen.com, hannes@cmpxchg.org, muchun.song@linux.dev Subject: Re: [PATCH 0/4] mm: page_ext: Introduce new iteration API Message-Id: <20250219155212.9474b8c44bd58780a54c8a6e@linux-foundation.org> In-Reply-To: References: X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-pc-linux-gnu) 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-Transfer-Encoding: 7bit On Tue, 18 Feb 2025 21:17:46 -0500 Luiz Capitulino wrote: > To fix this, this series introduces a new iteration API for page extension > objects. The API checks if the next page extension object can be retrieved > from the current section or if it needs to look up for it in another > section. > > ... A regression since 6.12, so we should backport the fix. > ... > > include/linux/page_ext.h | 67 +++++++++++++++++++++++++++++++++++++--- > mm/page_ext.c | 48 ++++++++++++++++++++++++++++ > mm/page_owner.c | 61 +++++++++++++++++------------------- > mm/page_table_check.c | 39 +++++++---------------- > 4 files changed, 152 insertions(+), 63 deletions(-) That's a lot to backport! Is there some quick-n-dirty fixup we can apply for the sake of -stable kernels, then work on this long-term approach for future kernels?