From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 31854C352A4 for ; Mon, 10 Feb 2020 05:45:33 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id EAE7E20870 for ; Mon, 10 Feb 2020 05:45:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="b7/b7G5Z" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EAE7E20870 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 7BA8B6B00B8; Mon, 10 Feb 2020 00:45:32 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 71D3D6B00B9; Mon, 10 Feb 2020 00:45:32 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 60BAC6B00BA; Mon, 10 Feb 2020 00:45:32 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0200.hostedemail.com [216.40.44.200]) by kanga.kvack.org (Postfix) with ESMTP id 41FC96B00B8 for ; Mon, 10 Feb 2020 00:45:32 -0500 (EST) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id EFE182DFD for ; Mon, 10 Feb 2020 05:45:31 +0000 (UTC) X-FDA: 76473130062.17.vein94_4d5e71ad37235 X-HE-Tag: vein94_4d5e71ad37235 X-Filterd-Recvd-Size: 2430 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf30.hostedemail.com (Postfix) with ESMTP for ; Mon, 10 Feb 2020 05:45:31 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AAD3720715; Mon, 10 Feb 2020 05:45:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581313530; bh=a6GtMCJ6LYEgHRTB2twm3iLrqc5jPa8TECt9e1cyYmo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=b7/b7G5ZgOyBEAo9Vq/29ja3ynt+kXXDaiBfqcKrJtMwLtsgF+kEzZodYZQwgB5+U Cix0Nfj9oMg3bLpFm+fVwcg3+v9VZsKKt7+QGF2d2QtEz2R8aAA3yo+Oui770qwzwt atl0lve2djKpBApDNLd4yMuWzgktRx+JnKs2YjiE= Date: Sun, 9 Feb 2020 21:45:30 -0800 From: Andrew Morton To: Shile Zhang Cc: Kirill Tkhai , Pavel Tatashin , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH RESEND] mm: fix tick_sched timer blocked by pgdat_resize_lock Message-Id: <20200209214530.e17798f182000b7726a621c5@linux-foundation.org> In-Reply-To: <39eb8ac4-bdb2-bdf2-9189-2d088edb43c1@linux.alibaba.com> References: <20200110082510.172517-2-shile.zhang@linux.alibaba.com> <20200110093053.34777-1-shile.zhang@linux.alibaba.com> <1ee6088c-9e72-8824-3a9a-fc099d196faf@virtuozzo.com> <9420eab3-5e5e-150f-53c9-6cd40bacf859@virtuozzo.com> <39eb8ac4-bdb2-bdf2-9189-2d088edb43c1@linux.alibaba.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, 4 Feb 2020 15:24:38 +0800 Shile Zhang wrote: > Hi, Andrew, > > Sorry for ping, could you please also help to check this issue? > Any comments from you is welcome! > Kirill's suggestion isn't pretty but it appears that it will work OK - redo deferred_init_memmap() so it releases 1024(?) pages at a time, releasing and retaking pgdat_resize_lock/unlock each time around?