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Peter Anvin" , Thomas Gleixner , Ingo Molnar , "linux-kernel@vger.kernel.org" , "linux-doc@vger.kernel.org" , "linux-mm@kvack.org" , "linux-arch@vger.kernel.org" , "linux-api@vger.kernel.org" , Arnd Bergmann , Andy Lutomirski , Balbir Singh , Cyrill Gorcunov , Dave Hansen , "Eugene Syromiatnikov" , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu Subject: RE: [PATCH v17 08/26] x86/mm: Introduce _PAGE_COW Thread-Topic: [PATCH v17 08/26] x86/mm: Introduce _PAGE_COW Thread-Index: AQHW8DMjsVkr7OKTZEWf0jgz1DSfFaoyopGAgAAD/wCAAAFTAA== Date: Thu, 21 Jan 2021 22:32:35 +0000 Message-ID: References: <20201229213053.16395-1-yu-cheng.yu@intel.com> <20201229213053.16395-9-yu-cheng.yu@intel.com> <20210121184405.GE32060@zn.tnic> <9344cd90-1818-a716-91d2-2b85df01347b@infradead.org> In-Reply-To: <9344cd90-1818-a716-91d2-2b85df01347b@infradead.org> Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 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: RnJvbTogUmFuZHkgRHVubGFwDQo+IFNlbnQ6IDIxIEphbnVhcnkgMjAyMSAyMjoxOQ0KPiANCj4g T24gMS8yMS8yMSAyOjE2IFBNLCBEYXZpZCBMYWlnaHQgd3JvdGU6DQo+ID4gRnJvbTogWXUsIFl1 LWNoZW5nDQo+ID4+DQo+ID4+IE9uIDEvMjEvMjAyMSAxMDo0NCBBTSwgQm9yaXNsYXYgUGV0a292 IHdyb3RlOg0KPiA+Pj4gT24gVHVlLCBEZWMgMjksIDIwMjAgYXQgMDE6MzA6MzVQTSAtMDgwMCwg WXUtY2hlbmcgWXUgd3JvdGU6DQo+ID4+IFsuLi5dDQo+ID4+Pj4gQEAgLTM0Myw2ICszNDksMTYg QEAgc3RhdGljIGlubGluZSBwdGVfdCBwdGVfbWtvbGQocHRlX3QgcHRlKQ0KPiA+Pj4+DQo+ID4+ Pj4gICBzdGF0aWMgaW5saW5lIHB0ZV90IHB0ZV93cnByb3RlY3QocHRlX3QgcHRlKQ0KPiA+Pj4+ ICAgew0KPiA+Pj4+ICsJLyoNCj4gPj4+PiArCSAqIEJsaW5kbHkgY2xlYXJpbmcgX1BBR0VfUlcg bWlnaHQgYWNjaWRlbnRhbGx5IGNyZWF0ZQ0KPiA+Pj4+ICsJICogYSBzaGFkb3cgc3RhY2sgUFRF IChSVz0wLCBEaXJ0eT0xKS4gIE1vdmUgdGhlIGhhcmR3YXJlDQo+ID4+Pj4gKwkgKiBkaXJ0eSB2 YWx1ZSB0byB0aGUgc29mdHdhcmUgYml0Lg0KPiA+Pj4+ICsJICovDQo+ID4+Pj4gKwlpZiAoY3B1 X2ZlYXR1cmVfZW5hYmxlZChYODZfRkVBVFVSRV9TSFNUSykpIHsNCj4gPj4+PiArCQlwdGUucHRl IHw9IChwdGUucHRlICYgX1BBR0VfRElSVFkpID4+IF9QQUdFX0JJVF9ESVJUWSA8PCBfUEFHRV9C SVRfQ09XOw0KPiA+Pj4NCj4gPj4+IFdoeSB0aGUgdW5yZWFkYWJsZSBzaGlmdGluZyB3aGVuIHlv dSBjYW4gc2ltcGx5IGRvOg0KPiA+Pj4NCj4gPj4+ICAgICAgICAgICAgICAgICAgaWYgKHB0ZS5w dGUgJiBfUEFHRV9ESVJUWSkNCj4gPj4+ICAgICAgICAgICAgICAgICAgICAgICAgICBwdGUucHRl IHw9IF9QQUdFX0NPVzsNCj4gPj4+DQo+ID4NCj4gPj4+ID8NCj4gPj4NCj4gPj4gSXQgY2xlYXJz IF9QQUdFX0RJUlRZIGFuZCBzZXRzIF9QQUdFX0NPVy4gIFRoYXQgaXMsDQo+ID4+DQo+ID4+IGlm IChwdGUucHRlICYgX1BBR0VfRElSVFkpIHsNCj4gPj4gCXB0ZS5wdGUgJj0gfl9QQUdFX0RJUlRZ Ow0KPiA+PiAJcHRlLnB0ZSB8PSBfUEFHRV9DT1c7DQo+ID4+IH0NCj4gPj4NCj4gPj4gU28sIHNo aWZ0aW5nIG1ha2VzIHJlc3VsdGluZyBjb2RlIG1vcmUgZWZmaWNpZW50Lg0KPiA+DQo+ID4gRG9l cyB0aGUgY29tcGlsZXIgbWFuYWdlIHRvIGRvIG9uZSBzaGlmdD8NCj4gPg0KPiA+IEhvdyBjYW4g aXQgY2xlYXIgYW55dGhpbmc/DQo+IA0KPiBJdCBjb3VsZCBzaGlmdCBpdCBvZmYgZWl0aGVyIGVu ZCBzaW5jZSB0aGVyZSBhcmUgYm90aCA8PCBhbmQgPj4uDQoNCkl0IGlzIHN0aWxsOg0KCXB0ZS5w dGUgfD0geHh4eHh4eDsNCg0KPiA+IFRoZXJlIGlzIG9ubHkgYW4gfD0gYWdhaW5zdCB0aGUgdGFy Z2V0Lg0KPiA+DQo+ID4gU29tZXRoaW5nIGhvcnJpZCB3aXRoIF49IG1pZ2h0IHNldCBhbmQgY2xl YXIuDQoNCkl0IGNvdWxkIGJlIDQgaW5zdHJ1Y3Rpb25zOg0KCWlzX2RpcnR5ID0gcHRlLnB0ZSAm IFBBR0VfRElSVFk7DQoJcHRlLnB0ZSAmPSB+UEFHRV9ESVJUWTsgLy8gb3IgcHRlLnB0ZSBePSBp c19kaXJ0eQ0KCWlzX2NvdyA9IGlzX2RpcnR5IDw8IChCSVRfQ09XIC0gQklUX0RJUlRZKTsgLy8g b3IgZXF1aXZhbGVudCA+Pg0KCXB0ZS5wdGUgfD0gaXNfY293Ow0KcHJvdmlkZWQgeW91J3ZlIGEg dGhyZWUgb3BlcmFuZCBmb3JtIGZvciBvbmUgb2YgdGhlIGZpcnN0IHR3byBpbnN0cnVjdGlvbnMu DQpTb21ldGhpbmcgbGlrZSBBUk0gbWlnaHQgbWFuYWdlIHRvIG1lcmdlIHRoZSBsYXN0IHR3byBh cyB3ZWxsLg0KQnV0IHRoZSByZWdpc3RlciBkZXBlbmRlbmN5IGNoYWluIGxlbmd0aCBtYXkgbWF0 dGVyIG1vcmUgdGhhbg0KdGhlIG51bWJlciBvZiBpbnN0cnVjdGlvbnMuDQpUaGUgYWJvdmUgaXMg bGlrZWx5IHRvIGJlIHRocmVlIGxvbmcuDQoNCglEYXZpZA0KDQotDQpSZWdpc3RlcmVkIEFkZHJl c3MgTGFrZXNpZGUsIEJyYW1sZXkgUm9hZCwgTW91bnQgRmFybSwgTWlsdG9uIEtleW5lcywgTUsx IDFQVCwgVUsNClJlZ2lzdHJhdGlvbiBObzogMTM5NzM4NiAoV2FsZXMpDQo=