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Shutemov" Cc: "linux-mm@kvack.org" , 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>, <20200403110845320979121@gmail.com> X-Priority: 3 X-GUID: 759EDD64-4A39-471F-8CCB-58F6AF82CDBB X-Has-Attach: no X-Mailer: Foxmail 7.2.13.365[cn] Mime-Version: 1.0 Message-ID: <20200405092656780211145@gmail.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000076, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: T24gMjAyMC0wNC0wM8KgYXQgMTE6MDjCoExpIFhpbmhhacKgd3JvdGU6Cj5PbiAyMDIwLTA0LTAy wqBhdCAyMTo1OcKgS2lyaWxsIEEuIFNodXRlbW92wqB3cm90ZToKPj5PbiBTYXQsIEZlYiAwOCwg MjAyMCBhdCAwODozNToyN0FNICswMDAwLCBMaSBYaW5oYWkgd3JvdGU6Cj4+PiBUaGlzIHJldmVy dHMgY29tbWl0IDRlNGE5ZWI5MjEzMzJiOWQxZWRkOTlmNzY5OThmOTlmMzZiMTk1ZjcKPj4+IElu IGR1cF9tbWFwKCksIGFub25fdm1hX2ZvcmsoKSBpcyBjYWxsZWQgZm9yIGF0dGFjaGluZyBhbm9u X3ZtYSBhbmQKPj4+IHBhcmFtZXRlciAndG1wJ8KgIChpLmUuLCB0aGUgbmV3IHZtYSBvZiBjaGls ZCkgaGFzIHNhbWUgLT52bV9uZXh0IGFuZAo+Pj4gLT52bV9wcmV2IGFzIGl0cyBwYXJlbnQgdm1h LiBUaGF0IGNhdXNlcyB0aGUgYW5vbl92bWEgdXNlZCBieSBwYXJlbnQgYmVlbgo+Pj4gbWlzdGFr ZW5seSBzaGFyZWQgYnkgY2hpbGQgKEluIGFub25fdm1hX2Nsb25lKCksIHRoZSBjb2RlIGFkZGVk IGJ5IHRoYXQKPj4+IGNvbW1pdCB3aWxsIGRvIHRoaXMgcmV1c2Ugd29yaykuCj4+Pgo+Pj4gQmVz aWRlcyB0aGlzIGlzc3VlLCB0aGUgZGVzaWduIG9mIHJldXNpbmcgYW5vbl92bWEgZnJvbSB2bWEg d2hpY2ggaGFzCj4+PiBnb25lIHRocm91Z2ggZm9yayBzaG91bGQgYmUgYXZvaWRlZCAoWzFdKS4g U28sIHRoaXMgcGF0Y2ggcmV2ZXJ0cyB0aGF0Cj4+PiBjb21taXQgYW5kIG1haW50YWlucyB0aGUg Y29uc2lzdGVudCBsb2dpYyBvZiByZXVzaW5nIGFub25fdm1hIGZvcgo+Pj4gZm9yay9zcGxpdC9t ZXJnZSB2bWEuCj4+Pgo+Pj4gWzFdIGNvbW1pdCBkMGU5ZmUxNzU4ZjIgKCJTaW1wbGlmeSBhbmQg Y29tbWVudCBvbiBhbm9uX3ZtYSByZS11c2UgZm9yCj4+PsKgwqDCoMKgIGFub25fdm1hX3ByZXBh cmUoKSIpIGV4cGxhaW5zIHRoZSB0ZXN0IG9mICJsaXN0X2lzX3Npbmd1bGFyKCkiLgo+Pgo+Pkkg cmVhZCB0aGUgZGVzY3JpcHRpb24gZmV3IHRpbWUsIGJ1dCBJIGNhbm5vdCBzYXkgSSB1bmRlcnN0 b29kIHRoZQo+PnByb2JsZW0gY29tcGxldGVseS4gRG8geW91IGhhdmUgYSB0ZXN0LWNhc2UgdG8g ZGVtb25zdHJhdGUgdGhlIGlzc3VlPwo+Pgo+PklJVUMsIHJlLXVzaW5nIGFub25fdm1hIGFjcm9z cyBmb3JrIGlzIHdyb25nLCBidXQgd2l0aGluIHRoZSBwcm9jZXNzIGlzCj4+ZmluZSwgcmlnaHQ/ Cj4+Cj4KPlllcywgcmUtdXNpbmcgYW5vbl92bWEgd2l0aGluIHRoZSBwcm9jZXNzIGlzIGZpbmUu IEJ1dCBpZiBhIHZtYSBoYXMgZ29uZSB0aHJvdWdoCj5mb3JrKCksIHRoZW4gdGhhdCB2bWEncyBh bm9uX3ZtYSBzaG91bGQgbm90IGJlIHNoYXJlZCB3aXRoIGl0cyBuZWlnaGJvciB2bWEuCj5BcyBl eHBsYWluZWQgaW4gWzFdLCB3aGVuIHZtYSBnb25lIHRocm91Z2ggZm9yaygpLCB0aGUgY2hlY2sg Zm9yCj5saXN0X2lzX3Npbmd1bGFyKHZtYS0+YW5vbl92bWFfY2hhaW4pIHdpbGwgYmUgZmFsc2Us IGFuZCBkb24ndCBzaGFyZSBhbm9uX3ZtYS4KPgo+V2l0aCBjdXJyZW50IGlzc3VlLCBvbmUgZXhh bXBsZSBjYW4gY2xhcmlmeSBtb3JlOgo+cGFyZW50IHByb2Nlc3MgZG8gYmVsb3cgdHdvIHN0ZXBz Cj4xLiBwX3ZtYV8xIGlzIGNyZWF0ZWQgYW5kIHBfYW5vbl92bWFfMSBpcyBwcmVwYXJlZDsKPjIu IHBfdm1hXzIgaXMgY3JlYXRlZCBhbmQgc2hhcmUgcF9hbm9uX3ZtYV8xOyAodGhpcyBpcyBhbGxv d2VkLCBiZWNhdWVzIHBfdm1hXzEKPmRpZG4ndCBnb8KgdGhyb3VnaCBmb3JrKCkpOwo+cGFyZW50 IHByb2Nlc3MgZG8gZm9yaygpOgo+My4gY192bWFfMSBpcyBkdXAgZnJvbSBwX3ZtYV8xLCBhbmQg aGFzIGl0cyBvd24gY19hbm9uX3ZtYV8xIHByZXBhcmVkOyBhdCB0aGlzIHBvaW50LAo+Y192bWFf MS0+YW5vbl92bWFfY2hhaW4gaGFzIHR3byBpdGVtcywgb25lIGZvciBwX2Fub25fdm1hXzEgYW5k IG9uZSBmb3IKPmNfYW5vbl92bWFfMTsKPjQuIGNfdm1hXzIgaXMgZHVwIGZyb20gcF92bWFfMiwg aXQgaXMgbm90IGFsbG93ZWQgdG8gc2hhcmUgY19hbm9uX3ZtYV8xLCBiZWNhdXNlwqAKPmNfdm1h XzEtPmFub25fdm1hX2NoYWluIGhhcyB0d28gaXRlbXMuwqAKPgo+Pk1heWJlIHdlIHNob3VsZCBq dXN0IGNoZWNrIHRoYXQgZHN0LT52bV9tbSBtYXRjaGVzIHNyYy0+dm1fbW0gYmVmb3JlCj4+cmUt dXNpbmcgYW5vbl92bWE/Cj4KPlRoaXMgZG9uJ3QgaGVscCwgaWluIGZvcmsoKSBwYXRoLCBkc3Qt PnZtX21tIGFsd2F5cyBkb24ndCBtYXRjaCBzcmMtPnZtX21tLsKgCj4gCgpJZiAtPnZtX25leHQg YW5kIC0+dm1fcHJldiBoYXZlIGJlZW4gc2V0IGFzIE5VTEwgaW7CoHZtX2FyZWFfZHVwKCksIHRo ZSBleGlzdGluZwpjb2RlIHdpbGwgY3Jhc2ggaW1tZWRpYXRlbHkgYnkgZGVyZWZlcmVuY2UgTlVM TCBwb2ludCAoaS5lLiwgcHJldiBpcyBOVUxMLCBhbmQgdXNlCnByZXYtPmFub25fdm1hKSwgaW5z dGVhZCBvZiBnZXR0aW5nIGludm9sdmVkIGluIHBhcmVudCBhbm9uX3ZtYS4KCkkgZG9uJ3QgY2hv b3NlIHRvIGZpeCB0aGlzIE5VTEwgcG9pbnRlciBkZXJlZmVyZW5jZSwgYnV0IHJldmVydCB0aGUg Y29tbWl0IGJlY2F1c2UKb2YgdGhlIHJlYXNvbiBhcyBkZXNjcmliZWQgaW4gdGhlIGxhc3QgcGFy YWdyYXBoIG9mIGNvbW1pdCBtZXNzYWdlLgoKQW5kcmV3LCBwbGVhc2UgY29uc2lkZXIgbWVyZ2Ug dGhpcyBwYXRjaCBhcyB0aGUgZXhpc3RpbmcgY29kZSBoYXMgbm8gdmFsdWUgdG8KcmVtYWluLgoK Pj4KPj4tLQo+PiBLaXJpbGwgQS4gU2h1dGVtb3YgCg==