From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kara Subject: Re: [PATCH v6 17/24] mm/gup: track FOLL_PIN pages Date: Tue, 19 Nov 2019 12:37:46 +0100 Message-ID: <20191119113746.GD25605@quack2.suse.cz> References: <20191119081643.1866232-1-jhubbard@nvidia.com> <20191119081643.1866232-18-jhubbard@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mx1.suse.de (mx2.suse.de [195.135.220.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id 54A666E89E for ; Tue, 19 Nov 2019 11:37:55 +0000 (UTC) Content-Disposition: inline In-Reply-To: <20191119081643.1866232-18-jhubbard@nvidia.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: John Hubbard Cc: Michal Hocko , Jan Kara , kvm@vger.kernel.org, linux-doc@vger.kernel.org, David Airlie , Dave Chinner , dri-devel@lists.freedesktop.org, LKML , linux-mm@kvack.org, Paul Mackerras , linux-kselftest@vger.kernel.org, Ira Weiny , Jonathan Corbet , linux-rdma@vger.kernel.org, Michael Ellerman , Christoph Hellwig , Jason Gunthorpe , Vlastimil Babka , =?iso-8859-1?Q?Bj=F6rn_T=F6pel?= , linux-media@vger.kernel.org, Shuah Khan , linux-block@vger.kernel.org, =?iso-8859-1?B?Suly9G1l?= Glisse , Al Viro , Dan Williams , Mauro Carvalho Chehab List-Id: dri-devel@lists.freedesktop.org T24gVHVlIDE5LTExLTE5IDAwOjE2OjM2LCBKb2huIEh1YmJhcmQgd3JvdGU6Cj4gQEAgLTIwMjUs NiArMjE0OSwyMCBAQCBzdGF0aWMgaW50IF9fcmVjb3JkX3N1YnBhZ2VzKHN0cnVjdCBwYWdlICpw YWdlLCB1bnNpZ25lZCBsb25nIGFkZHIsCj4gIAlyZXR1cm4gbnI7Cj4gIH0KPiAgCj4gK3N0YXRp YyBib29sIF9fcGluX2NvbXBvdW5kX2hlYWQoc3RydWN0IHBhZ2UgKmhlYWQsIGludCByZWZzLCB1 bnNpZ25lZCBpbnQgZmxhZ3MpCj4gK3sKCkkgZG9uJ3QgcXVpdGUgbGlrZSB0aGUgcHJvbGlmZXJh dGlvbiBvZiBuYW1lcyBzdGFydGluZyB3aXRoIF9fLiBJIGRvbid0CnRoaW5rIHRoZXJlJ3MgYSBn b29kIHJlYXNvbiBmb3IgdGhhdCwgcGFydGljdWxhcmx5IGluIHRoaXMgY2FzZS4gQWxzbyAncGlu JwpoZXJlIGlzIHNvbWV3aGF0IG1pc2xlYWRpbmcgYXMgd2UgYWxyZWFkeSB1c2UgdGVybSAicGlu IiBmb3IgdGhlIHBhcnRpY3VsYXIKd2F5IG9mIHBpbm5pbmcgdGhlIHBhZ2UuIFdlIGNvdWxkIGhh dmUgZ3JhYl9jb21wb3VuZF9oZWFkKCkgb3IgbWF5YmUKbmFpbF9jb21wb3VuZF9oZWFkKCkgOiks IGJ1dCB5b3UncmUgbmF0aXZlIHNwZWFrZXIgc28geW91IG1heSBjb21lIHVwIHdpdGgKYmV0dGVy IHdvcmQuCgo+ICsJaWYgKGZsYWdzICYgRk9MTF9QSU4pIHsKPiArCQlpZiAodW5saWtlbHkoIXRy eV9waW5fY29tcG91bmRfaGVhZChoZWFkLCByZWZzKSkpCj4gKwkJCXJldHVybiBmYWxzZTsKPiAr CX0gZWxzZSB7Cj4gKwkJaGVhZCA9IHRyeV9nZXRfY29tcG91bmRfaGVhZChoZWFkLCByZWZzKTsK PiArCQlpZiAoIWhlYWQpCj4gKwkJCXJldHVybiBmYWxzZTsKPiArCX0KPiArCj4gKwlyZXR1cm4g dHJ1ZTsKPiArfQo+ICsKPiAgc3RhdGljIHZvaWQgcHV0X2NvbXBvdW5kX2hlYWQoc3RydWN0IHBh Z2UgKnBhZ2UsIGludCByZWZzKQo+ICB7Cj4gIAkvKiBEbyBhIGdldF9wYWdlKCkgZmlyc3QsIGlu IGNhc2UgcmVmcyA9PSBwYWdlLT5fcmVmY291bnQgKi8KCnB1dF9jb21wb3VuZF9oZWFkKCkgbmVl ZHMgc2ltaWxhciB0cmVhdG1lbnQgYXMgdW5kb19kZXZfcGFnZW1hcCgpLCBkb2Vzbid0Cml0PwoK PiBAQCAtOTY4LDcgKzk3MywxOCBAQCBzdHJ1Y3QgcGFnZSAqZm9sbG93X2Rldm1hcF9wbWQoc3Ry dWN0IHZtX2FyZWFfc3RydWN0ICp2bWEsIHVuc2lnbmVkIGxvbmcgYWRkciwKPiAgCWlmICghKnBn bWFwKQo+ICAJCXJldHVybiBFUlJfUFRSKC1FRkFVTFQpOwo+ICAJcGFnZSA9IHBmbl90b19wYWdl KHBmbik7Cj4gLQlnZXRfcGFnZShwYWdlKTsKPiArCj4gKwlpZiAoZmxhZ3MgJiBGT0xMX0dFVCkK PiArCQlnZXRfcGFnZShwYWdlKTsKPiArCWVsc2UgaWYgKGZsYWdzICYgRk9MTF9QSU4pIHsKPiAr CQkvKgo+ICsJCSAqIHRyeV9waW5fcGFnZSgpIGlzIG5vdCBhY3R1YWxseSBleHBlY3RlZCB0byBm YWlsIGhlcmUgYmVjYXVzZQo+ICsJCSAqIHdlIGhvbGQgdGhlIHBtZCBsb2NrIHNvIG5vIG9uZSBj YW4gdW5tYXAgdGhlIHBtZCBhbmQgZnJlZSB0aGUKPiArCQkgKiBwYWdlIHRoYXQgaXQgcG9pbnRz IHRvLgo+ICsJCSAqLwo+ICsJCWlmICh1bmxpa2VseSghdHJ5X3Bpbl9wYWdlKHBhZ2UpKSkKPiAr CQkJcGFnZSA9IEVSUl9QVFIoLUVGQVVMVCk7Cj4gKwl9CgpUaGlzIHBhdHRlcm4gaXMgcmF0aGVy IGNvbW1vbi4gU28gbWF5YmUgSSdkIGFkZCBhIGhlbHBlciBncmFiX3BhZ2UocGFnZSwKZmxhZ3Mp IGRvaW5nCgoJaWYgKGZsYWdzICYgRk9MTF9HRVQpCgkJZ2V0X3BhZ2UocGFnZSk7CgllbHNlIGlm IChmbGFncyAmIEZPTExfUElOKQoJCXJldHVybiB0cnlfcGluX3BhZ2UocGFnZSk7CglyZXR1cm4g dHJ1ZTsKCk90aGVyd2lzZSB0aGUgcGF0Y2ggbG9va3MgZ29vZCB0byBtZSBub3cuCgoJCQkJCQkJ CUhvbnphCi0tIApKYW4gS2FyYSA8amFja0BzdXNlLmNvbT4KU1VTRSBMYWJzLCBDUgpfX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpkcmktZGV2ZWwgbWFpbGlu ZyBsaXN0CmRyaS1kZXZlbEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5mcmVl ZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9kcmktZGV2ZWw= 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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 D487AC432C0 for ; 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Tue, 19 Nov 2019 11:37:52 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id 1D7961E47E5; Tue, 19 Nov 2019 12:37:46 +0100 (CET) Date: Tue, 19 Nov 2019 12:37:46 +0100 From: Jan Kara To: John Hubbard Subject: Re: [PATCH v6 17/24] mm/gup: track FOLL_PIN pages Message-ID: <20191119113746.GD25605@quack2.suse.cz> References: <20191119081643.1866232-1-jhubbard@nvidia.com> <20191119081643.1866232-18-jhubbard@nvidia.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20191119081643.1866232-18-jhubbard@nvidia.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michal Hocko , Jan Kara , kvm@vger.kernel.org, linux-doc@vger.kernel.org, David Airlie , Dave Chinner , dri-devel@lists.freedesktop.org, LKML , linux-mm@kvack.org, Paul Mackerras , linux-kselftest@vger.kernel.org, Ira Weiny , Jonathan Corbet , linux-rdma@vger.kernel.org, Michael Ellerman , Christoph Hellwig , Jason Gunthorpe , Vlastimil Babka , =?iso-8859-1?Q?Bj=F6rn_T=F6pel?= , linux-media@vger.kernel.org, Shuah Khan , linux-block@vger.kernel.org, =?iso-8859-1?B?Suly9G1l?= Glisse , Al Viro , Dan Williams , Mauro Carvalho Chehab , bpf@vger.kernel.org, Magnus Karlsson , Jens Axboe , netdev@vger.kernel.org, Alex Williamson , linux-fsdevel@vger.kernel.org, Andrew Morton , linuxppc-dev@lists.ozlabs.org, "David S . Miller" , Mike Kravetz Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Message-ID: <20191119113746.HGn6fxHW08H8x7YVOqznMeQZDWLJGjk4pv7z81woWMI@z> T24gVHVlIDE5LTExLTE5IDAwOjE2OjM2LCBKb2huIEh1YmJhcmQgd3JvdGU6Cj4gQEAgLTIwMjUs NiArMjE0OSwyMCBAQCBzdGF0aWMgaW50IF9fcmVjb3JkX3N1YnBhZ2VzKHN0cnVjdCBwYWdlICpw YWdlLCB1bnNpZ25lZCBsb25nIGFkZHIsCj4gIAlyZXR1cm4gbnI7Cj4gIH0KPiAgCj4gK3N0YXRp YyBib29sIF9fcGluX2NvbXBvdW5kX2hlYWQoc3RydWN0IHBhZ2UgKmhlYWQsIGludCByZWZzLCB1 bnNpZ25lZCBpbnQgZmxhZ3MpCj4gK3sKCkkgZG9uJ3QgcXVpdGUgbGlrZSB0aGUgcHJvbGlmZXJh dGlvbiBvZiBuYW1lcyBzdGFydGluZyB3aXRoIF9fLiBJIGRvbid0CnRoaW5rIHRoZXJlJ3MgYSBn b29kIHJlYXNvbiBmb3IgdGhhdCwgcGFydGljdWxhcmx5IGluIHRoaXMgY2FzZS4gQWxzbyAncGlu JwpoZXJlIGlzIHNvbWV3aGF0IG1pc2xlYWRpbmcgYXMgd2UgYWxyZWFkeSB1c2UgdGVybSAicGlu IiBmb3IgdGhlIHBhcnRpY3VsYXIKd2F5IG9mIHBpbm5pbmcgdGhlIHBhZ2UuIFdlIGNvdWxkIGhh dmUgZ3JhYl9jb21wb3VuZF9oZWFkKCkgb3IgbWF5YmUKbmFpbF9jb21wb3VuZF9oZWFkKCkgOiks IGJ1dCB5b3UncmUgbmF0aXZlIHNwZWFrZXIgc28geW91IG1heSBjb21lIHVwIHdpdGgKYmV0dGVy IHdvcmQuCgo+ICsJaWYgKGZsYWdzICYgRk9MTF9QSU4pIHsKPiArCQlpZiAodW5saWtlbHkoIXRy eV9waW5fY29tcG91bmRfaGVhZChoZWFkLCByZWZzKSkpCj4gKwkJCXJldHVybiBmYWxzZTsKPiAr CX0gZWxzZSB7Cj4gKwkJaGVhZCA9IHRyeV9nZXRfY29tcG91bmRfaGVhZChoZWFkLCByZWZzKTsK PiArCQlpZiAoIWhlYWQpCj4gKwkJCXJldHVybiBmYWxzZTsKPiArCX0KPiArCj4gKwlyZXR1cm4g dHJ1ZTsKPiArfQo+ICsKPiAgc3RhdGljIHZvaWQgcHV0X2NvbXBvdW5kX2hlYWQoc3RydWN0IHBh Z2UgKnBhZ2UsIGludCByZWZzKQo+ICB7Cj4gIAkvKiBEbyBhIGdldF9wYWdlKCkgZmlyc3QsIGlu IGNhc2UgcmVmcyA9PSBwYWdlLT5fcmVmY291bnQgKi8KCnB1dF9jb21wb3VuZF9oZWFkKCkgbmVl ZHMgc2ltaWxhciB0cmVhdG1lbnQgYXMgdW5kb19kZXZfcGFnZW1hcCgpLCBkb2Vzbid0Cml0PwoK PiBAQCAtOTY4LDcgKzk3MywxOCBAQCBzdHJ1Y3QgcGFnZSAqZm9sbG93X2Rldm1hcF9wbWQoc3Ry dWN0IHZtX2FyZWFfc3RydWN0ICp2bWEsIHVuc2lnbmVkIGxvbmcgYWRkciwKPiAgCWlmICghKnBn bWFwKQo+ICAJCXJldHVybiBFUlJfUFRSKC1FRkFVTFQpOwo+ICAJcGFnZSA9IHBmbl90b19wYWdl KHBmbik7Cj4gLQlnZXRfcGFnZShwYWdlKTsKPiArCj4gKwlpZiAoZmxhZ3MgJiBGT0xMX0dFVCkK PiArCQlnZXRfcGFnZShwYWdlKTsKPiArCWVsc2UgaWYgKGZsYWdzICYgRk9MTF9QSU4pIHsKPiAr CQkvKgo+ICsJCSAqIHRyeV9waW5fcGFnZSgpIGlzIG5vdCBhY3R1YWxseSBleHBlY3RlZCB0byBm YWlsIGhlcmUgYmVjYXVzZQo+ICsJCSAqIHdlIGhvbGQgdGhlIHBtZCBsb2NrIHNvIG5vIG9uZSBj YW4gdW5tYXAgdGhlIHBtZCBhbmQgZnJlZSB0aGUKPiArCQkgKiBwYWdlIHRoYXQgaXQgcG9pbnRz IHRvLgo+ICsJCSAqLwo+ICsJCWlmICh1bmxpa2VseSghdHJ5X3Bpbl9wYWdlKHBhZ2UpKSkKPiAr CQkJcGFnZSA9IEVSUl9QVFIoLUVGQVVMVCk7Cj4gKwl9CgpUaGlzIHBhdHRlcm4gaXMgcmF0aGVy IGNvbW1vbi4gU28gbWF5YmUgSSdkIGFkZCBhIGhlbHBlciBncmFiX3BhZ2UocGFnZSwKZmxhZ3Mp IGRvaW5nCgoJaWYgKGZsYWdzICYgRk9MTF9HRVQpCgkJZ2V0X3BhZ2UocGFnZSk7CgllbHNlIGlm IChmbGFncyAmIEZPTExfUElOKQoJCXJldHVybiB0cnlfcGluX3BhZ2UocGFnZSk7CglyZXR1cm4g dHJ1ZTsKCk90aGVyd2lzZSB0aGUgcGF0Y2ggbG9va3MgZ29vZCB0byBtZSBub3cuCgoJCQkJCQkJ CUhvbnphCi0tIApKYW4gS2FyYSA8amFja0BzdXNlLmNvbT4KU1VTRSBMYWJzLCBDUgpfX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpkcmktZGV2ZWwgbWFpbGlu ZyBsaXN0CmRyaS1kZXZlbEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5mcmVl ZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9kcmktZGV2ZWw=