Received: by 2002:a25:1506:0:0:0:0:0 with SMTP id 6csp3363805ybv;
        Sun, 9 Feb 2020 21:49:19 -0800 (PST)
X-Google-Smtp-Source: APXvYqziUMpGXWJ8OHFSeXJkD1PW+kkBwlbcienF6ybmeR05aLFDVEXj2xsDyQhlNYT2HXfFKMXd
X-Received: by 2002:a9d:518b:: with SMTP id y11mr8530379otg.349.1581313759338;
        Sun, 09 Feb 2020 21:49:19 -0800 (PST)
ARC-Seal: i=1; a=rsa-sha256; t=1581313759; cv=none;
        d=google.com; s=arc-20160816;
        b=YIP7oaM3UXISt5GFgGXnoINS+9Xy9jJtlc64Nz9tDptPB4VDCTkvs030pD6aSCZTFq
         riJbUW8lIj63XcqQL7LAzCHPn3PgJgN/9nb56e+0Ob/1loy2jTRv9g2s2Iyg0741tfm5
         ajfjBuQ9w90TuPRod5AlZhsFgtjDJNG5YRzPHn1gF75UN6jXSFfxIr2C1pt4Sbet/lfF
         SFOMYu6eyvoHGEo6VIsBufjel/EWBYg9u+22b7xv3bbDdZg8P1irBTwEByYRj6kCSpZW
         i/yE5O6YJkPjYZqGL4mhk6fKGhAL162HVgxZXq/3Cvb9yvIFVDjZriwk8xQcn6MjKS8U
         kbRw==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=list-id:precedence:sender:content-transfer-encoding:mime-version
         :references:in-reply-to:message-id:subject:cc:to:from:date
         :dkim-signature;
        bh=aJDVWdDMwib7CZTUAULfhB0ZrUdfTlL891I+zqWgHfo=;
        b=PmAHqVEm3g+PFt9NkpRv/zbnCDWZxodSlK5DR9WH9UTy8Rc8bUyBMYy1Dj/B7UzBib
         kcvyXW5WvjauimNq4qdfHmUaq9MwAt3PP9PoKfcJt58Gp3RxHUVKp2tlxOq4BTgR8A6g
         bk/CiTKtirQevU4cgj5oVcUKPST38fCu45IO58nueM0NBTS/E6pRB5u39eTzfo1o3PO5
         yZyA4UcwUD12v58kQ3mexBw2wt7rOW7i6YQff0Icom8tcct64vi7lKIb1lT9p0WDqtxq
         RXYiZgNRJqLOa5Uln9weUbuc2qUP2POaw8c4nBtqI60hkAqAHmpWnsKBkKHJZ33EM/ic
         bPcA==
ARC-Authentication-Results: i=1; mx.google.com;
       dkim=pass header.i=@kernel.org header.s=default header.b="b7/b7G5Z";
       spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67])
        by mx.google.com with ESMTP id z14si4205915oth.15.2020.02.09.21.49.07;
        Sun, 09 Feb 2020 21:49:19 -0800 (PST)
Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Authentication-Results: mx.google.com;
       dkim=pass header.i=@kernel.org header.s=default header.b="b7/b7G5Z";
       spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1727022AbgBJFpb (ORCPT <rfc822;fezhang.suse@gmail.com>
        + 99 others); Mon, 10 Feb 2020 00:45:31 -0500
Received: from mail.kernel.org ([198.145.29.99]:57402 "EHLO mail.kernel.org"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1726796AbgBJFpb (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 10 Feb 2020 00:45:31 -0500
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 <akpm@linux-foundation.org>
To:     Shile Zhang <shile.zhang@linux.alibaba.com>
Cc:     Kirill Tkhai <ktkhai@virtuozzo.com>,
        Pavel Tatashin <pasha.tatashin@soleen.com>, 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>
        <c7ac0338-78a6-2ae3-465c-2d6371d96a72@linux.alibaba.com>
        <9420eab3-5e5e-150f-53c9-6cd40bacf859@virtuozzo.com>
        <ba242ee6-22be-3047-5a88-e6b39e1509ef@linux.alibaba.com>
        <e87a04fa-c96b-c15e-126e-46f1cc2885d1@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
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue, 4 Feb 2020 15:24:38 +0800 Shile Zhang <shile.zhang@linux.alibaba.com> 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?