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=-0.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 6FC1EC43331 for ; Fri, 3 Apr 2020 03:08:52 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 163C52077D for ; Fri, 3 Apr 2020 03:08:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="tp7FJgcX" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 163C52077D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 95A9D8E0008; Thu, 2 Apr 2020 23:08:51 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 90B8C8E0007; Thu, 2 Apr 2020 23:08:51 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7D2CE8E0008; Thu, 2 Apr 2020 23:08:51 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0099.hostedemail.com [216.40.44.99]) by kanga.kvack.org (Postfix) with ESMTP id 613BD8E0007 for ; Thu, 2 Apr 2020 23:08:51 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 19C75180AD81A for ; Fri, 3 Apr 2020 03:08:51 +0000 (UTC) X-FDA: 76665061662.22.unit44_3020f75911e19 X-HE-Tag: unit44_3020f75911e19 X-Filterd-Recvd-Size: 6195 Received: from mail-lf1-f66.google.com (mail-lf1-f66.google.com [209.85.167.66]) by imf49.hostedemail.com (Postfix) with ESMTP for ; Fri, 3 Apr 2020 03:08:50 +0000 (UTC) Received: by mail-lf1-f66.google.com with SMTP id j17so4532539lfe.7 for ; Thu, 02 Apr 2020 20:08:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:references:mime-version:message-id :content-transfer-encoding; bh=jT5+kBgkArxSHsTQLhhIgYv+TF/1h5NuGejEg5H/LkU=; b=tp7FJgcXZKymIUzsmzgeagNJu6CUXVsJgSnFvtAQ/wUbQGbSZPNBQ15dNSx7l1rCgz wfsT5QL36LeWWg3QZjxHN7ZSApi6f2R8kkx9uNlmBUdN6DtmAPBjnut3G/UdIRG0gOjV PtFB1Bovx+HaUJgV9beyss4tHyWYlAghTpAkL1+kpJkMPcUEsENBUMaojJMFZ2Kgzvk3 phi6S0OO+3JBLjXSiU4PtUyR4ugPOPxA5nC9rjPKtLcyjMEfKkeqbr6VnC9CK7q67Dwn SMoC1G/TOxYl/GDjRmDUHcgiaWQG65pdNKiaE85qBm7hmM5QGkm5giHlvWmQyOvQMXs4 mNrg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:references:mime-version :message-id:content-transfer-encoding; bh=jT5+kBgkArxSHsTQLhhIgYv+TF/1h5NuGejEg5H/LkU=; b=jI9pql6BQQhrDNmv4oQbsCTNX8UAKUl+wfF6/op9elQ8gAHqonFFEfb4FDZZlvaf9I u7pD0M5KV5JbCXfbU/GM4MxmB31j5jpF/F439nkABAEXM2iTbaspqJJ9LVWo+Nrn0/uo F6LUtI+lcPttTWNhxmWParkZ5cWTwoUOFOIKdIN1f6hyMeA32xofnTrCE5Njtju10az+ vXOk38Us9CCqJ9SLAO6Bd1yzKoULbJOCKZaOVbsarHaXzZoWlZFBYgUkMwpfkYrh0K6h K8Wm124ePiH/1eZ9OqMUaxpSxpYTnCDsGHD9fhpFVVcr7zUeMtTQZHwaUeSMTiM5C+B+ BeLQ== X-Gm-Message-State: AGi0PuaQfXm09kjP/mYj4i/LG8Ul86C4qyLiqA0urkl/gGH0wkXcHwj7 VLLfLt3U7oao5rs5XHRmJ7A= X-Google-Smtp-Source: APiQypIuytZkNkbTbe7HHpTWY4KrJ3a6m6+4FuB64ZlmM3ecmA01Sk86Ts77SiKfiMGG7rbXptye/A== X-Received: by 2002:ac2:4199:: with SMTP id z25mr3974391lfh.90.1585883329056; Thu, 02 Apr 2020 20:08:49 -0700 (PDT) Received: from N-20L6PF1KTYA2 ([131.228.2.21]) by smtp.gmail.com with ESMTPSA id h22sm117647ljl.96.2020.04.02.20.08.46 (version=TLS1_2 cipher=AES128-GCM-SHA256 bits=128/128); Thu, 02 Apr 2020 20:08:48 -0700 (PDT) Date: Fri, 3 Apr 2020 11:08:46 +0800 From: "Li Xinhai" To: "Kirill A. Shutemov" Cc: "linux-mm@kvack.org" , akpm , kirill.shutemov , willy , hannes Subject: Re: [PATCH 2/3] Revert "mm/rmap.c: reuse mergeable anon_vma as parent when fork" References: <1581150928-3214-1-git-send-email-lixinhai.lxh@gmail.com>, <1581150928-3214-3-git-send-email-lixinhai.lxh@gmail.com>, <20200402135922.kcllgas7omuyn5h7@box> X-Priority: 3 X-GUID: 09698061-8A70-46A1-94DC-D7FEA1A71CE4 X-Has-Attach: no X-Mailer: Foxmail 7.2.13.365[cn] Mime-Version: 1.0 Message-ID: <20200403110845320979121@gmail.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000003, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: T24gMjAyMC0wNC0wMsKgYXQgMjE6NTnCoEtpcmlsbCBBLiBTaHV0ZW1vdsKgd3JvdGU6Cj5PbiBT YXQsIEZlYiAwOCwgMjAyMCBhdCAwODozNToyN0FNICswMDAwLCBMaSBYaW5oYWkgd3JvdGU6Cj4+ IFRoaXMgcmV2ZXJ0cyBjb21taXQgNGU0YTllYjkyMTMzMmI5ZDFlZGQ5OWY3Njk5OGY5OWYzNmIx OTVmNwo+PiBJbiBkdXBfbW1hcCgpLCBhbm9uX3ZtYV9mb3JrKCkgaXMgY2FsbGVkIGZvciBhdHRh Y2hpbmcgYW5vbl92bWEgYW5kCj4+IHBhcmFtZXRlciAndG1wJ8KgIChpLmUuLCB0aGUgbmV3IHZt YSBvZiBjaGlsZCkgaGFzIHNhbWUgLT52bV9uZXh0IGFuZAo+PiAtPnZtX3ByZXYgYXMgaXRzIHBh cmVudCB2bWEuIFRoYXQgY2F1c2VzIHRoZSBhbm9uX3ZtYSB1c2VkIGJ5IHBhcmVudCBiZWVuCj4+ IG1pc3Rha2VubHkgc2hhcmVkIGJ5IGNoaWxkIChJbiBhbm9uX3ZtYV9jbG9uZSgpLCB0aGUgY29k ZSBhZGRlZCBieSB0aGF0Cj4+IGNvbW1pdCB3aWxsIGRvIHRoaXMgcmV1c2Ugd29yaykuCj4+Cj4+ IEJlc2lkZXMgdGhpcyBpc3N1ZSwgdGhlIGRlc2lnbiBvZiByZXVzaW5nIGFub25fdm1hIGZyb20g dm1hIHdoaWNoIGhhcwo+PiBnb25lIHRocm91Z2ggZm9yayBzaG91bGQgYmUgYXZvaWRlZCAoWzFd KS4gU28sIHRoaXMgcGF0Y2ggcmV2ZXJ0cyB0aGF0Cj4+IGNvbW1pdCBhbmQgbWFpbnRhaW5zIHRo ZSBjb25zaXN0ZW50IGxvZ2ljIG9mIHJldXNpbmcgYW5vbl92bWEgZm9yCj4+IGZvcmsvc3BsaXQv bWVyZ2Ugdm1hLgo+Pgo+PiBbMV0gY29tbWl0IGQwZTlmZTE3NThmMiAoIlNpbXBsaWZ5IGFuZCBj b21tZW50IG9uIGFub25fdm1hIHJlLXVzZSBmb3IKPj7CoMKgwqDCoCBhbm9uX3ZtYV9wcmVwYXJl KCkiKSBleHBsYWlucyB0aGUgdGVzdCBvZiAibGlzdF9pc19zaW5ndWxhcigpIi4KPgo+SSByZWFk IHRoZSBkZXNjcmlwdGlvbiBmZXcgdGltZSwgYnV0IEkgY2Fubm90IHNheSBJIHVuZGVyc3Rvb2Qg dGhlCj5wcm9ibGVtIGNvbXBsZXRlbHkuIERvIHlvdSBoYXZlIGEgdGVzdC1jYXNlIHRvIGRlbW9u c3RyYXRlIHRoZSBpc3N1ZT8KPgo+SUlVQywgcmUtdXNpbmcgYW5vbl92bWEgYWNyb3NzIGZvcmsg aXMgd3JvbmcsIGJ1dCB3aXRoaW4gdGhlIHByb2Nlc3MgaXMKPmZpbmUsIHJpZ2h0Pwo+IAoKWWVz LCByZS11c2luZyBhbm9uX3ZtYSB3aXRoaW4gdGhlIHByb2Nlc3MgaXMgZmluZS4gQnV0IGlmIGEg dm1hIGhhcyBnb25lIHRocm91Z2gKZm9yaygpLCB0aGVuIHRoYXQgdm1hJ3MgYW5vbl92bWEgc2hv dWxkIG5vdCBiZSBzaGFyZWQgd2l0aCBpdHMgbmVpZ2hib3Igdm1hLgpBcyBleHBsYWluZWQgaW4g WzFdLCB3aGVuIHZtYSBnb25lIHRocm91Z2ggZm9yaygpLCB0aGUgY2hlY2sgZm9yIApsaXN0X2lz X3Npbmd1bGFyKHZtYS0+YW5vbl92bWFfY2hhaW4pIHdpbGwgYmUgZmFsc2UsIGFuZCBkb24ndCBz aGFyZSBhbm9uX3ZtYS4KCldpdGggY3VycmVudCBpc3N1ZSwgb25lIGV4YW1wbGUgY2FuIGNsYXJp ZnkgbW9yZToKcGFyZW50IHByb2Nlc3MgZG8gYmVsb3cgdHdvIHN0ZXBzCjEuIHBfdm1hXzEgaXMg Y3JlYXRlZCBhbmQgcF9hbm9uX3ZtYV8xIGlzIHByZXBhcmVkOwoyLiBwX3ZtYV8yIGlzIGNyZWF0 ZWQgYW5kIHNoYXJlIHBfYW5vbl92bWFfMTsgKHRoaXMgaXMgYWxsb3dlZCwgYmVjYXVlcyBwX3Zt YV8xCmRpZG4ndCBnb8KgdGhyb3VnaCBmb3JrKCkpOwpwYXJlbnQgcHJvY2VzcyBkbyBmb3JrKCk6 CjMuIGNfdm1hXzEgaXMgZHVwIGZyb20gcF92bWFfMSwgYW5kIGhhcyBpdHMgb3duIGNfYW5vbl92 bWFfMSBwcmVwYXJlZDsgYXQgdGhpcyBwb2ludCwKY192bWFfMS0+YW5vbl92bWFfY2hhaW4gaGFz IHR3byBpdGVtcywgb25lIGZvciBwX2Fub25fdm1hXzEgYW5kIG9uZSBmb3IKY19hbm9uX3ZtYV8x Owo0LiBjX3ZtYV8yIGlzIGR1cCBmcm9tIHBfdm1hXzIsIGl0IGlzIG5vdCBhbGxvd2VkIHRvIHNo YXJlIGNfYW5vbl92bWFfMSwgYmVjYXVzZcKgCmNfdm1hXzEtPmFub25fdm1hX2NoYWluIGhhcyB0 d28gaXRlbXMuwqAKCj5NYXliZSB3ZSBzaG91bGQganVzdCBjaGVjayB0aGF0IGRzdC0+dm1fbW0g bWF0Y2hlcyBzcmMtPnZtX21tIGJlZm9yZQo+cmUtdXNpbmcgYW5vbl92bWE/IAoKVGhpcyBkb24n dCBoZWxwLCBpaW4gZm9yaygpIHBhdGgsIGRzdC0+dm1fbW0gYWx3YXlzIGRvbid0IG1hdGNoIHNy Yy0+dm1fbW0uwqAKCj4KPi0tCj4gS2lyaWxsIEEuIFNodXRlbW92