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[2620:137:e000::1:20]) by mx.google.com with ESMTP id be13-20020a056a001f0d00b005283d3bb832si15730340pfb.193.2022.09.26.01.00.52; Mon, 26 Sep 2022 01:01:04 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=C0dkGikT; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233417AbiIZGqZ (ORCPT + 99 others); Mon, 26 Sep 2022 02:46:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35466 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229903AbiIZGqV (ORCPT ); Mon, 26 Sep 2022 02:46:21 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7A1921FCD7; Sun, 25 Sep 2022 23:46:20 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 43045B818EA; Mon, 26 Sep 2022 06:46:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5C403C433C1; Mon, 26 Sep 2022 06:46:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1664174777; bh=t9ZFgSLybIz5CVVdKLuCZVxIGBv79vJKVx2moo8JR1E=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=C0dkGikTdJwSIYsRsuPv58FTU0YiRGsTottgzQ3yQZpEjwfHcgXLHiSB2JnMrEiqW gNEUmxaZN/6znRWSMHxZrkXFAaFI6C0o8KG8A0UiIOpFO+W70cG6aqshqcH+5WLgnR bAUXSH0pL0lAw63ScLK3XQIZCcmM5OhOSBq6lxbc= Date: Mon, 26 Sep 2022 08:46:15 +0200 From: Greg KH To: yong w Cc: jaewon31.kim@samsung.com, linux-kernel@vger.kernel.org, mhocko@kernel.org, stable@vger.kernel.org, wang.yong12@zte.com.cn, Joonsoo Kim , Andrew Morton , Johannes Weiner , Minchan Kim , Mel Gorman , Linus Torvalds Subject: Re: [PATCH v2 stable-4.19 1/3] mm/page_alloc: use ac->high_zoneidx for classzone_idx Message-ID: References: <20220925103529.13716-1-yongw.pur@gmail.com> <20220925103529.13716-2-yongw.pur@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Spam-Status: No, score=-7.2 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Sep 25, 2022 at 10:32:32PM +0800, yong w wrote: > Greg KH 于2022年9月25日周日 19:00写道: > > > > On Sun, Sep 25, 2022 at 03:35:27AM -0700, wangyong wrote: > > > From: Joonsoo Kim > > > > > > [ backport of commit 3334a45eb9e2bb040c880ef65e1d72357a0a008b ] > > > > This is from 5.8. What about the 5.4.y kernel? Why would someone > > upgrading from 4.19.y to 5.4.y suffer a regression here? > > > I encountered this problem on 4.19, but I haven't encountered it on 5.4. > However, this should be a common problem, so 5.4 may also need to be > merged. > > Hello, Joonsoo, what do you think? > > > And why wouldn't someone who has this issue just not use 5.10.y instead? > > What prevents someone from moving off of 4.19.y at this point in time? > > > This is a solution, but upgrading the kernel version requires time and overhead, > so use the patch is the most effective way, if there is. You will have to move off of 4.19 soon anyway, so why delay the change? thanks, greg k-h