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Tue, 6 Aug 2019 12:47:22 -0400 From: Hoan Tran OS Subject: Re: [PATCH v2 3/5] x86: Kconfig: Remove CONFIG_NODES_SPAN_OTHER_NODES Date: Tue, 6 Aug 2019 16:47:12 +0000 Message-ID: <910accd6-c491-acfd-237a-97edec7c0b42@os.amperecomputing.com> References: <1562887528-5896-1-git-send-email-Hoan@os.amperecomputing.com> <1562887528-5896-4-git-send-email-Hoan@os.amperecomputing.com> In-Reply-To: Content-Language: en-US Content-Type: text/plain; charset="utf-8" Content-ID: <56E2A1BBE7566D44917A8A23D9C7B097@prod.exchangelabs.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 Sender: linux-s390-owner@vger.kernel.org List-ID: To: Thomas Gleixner , Catalin Marinas , Will Deacon Cc: Andrew Morton , Michal Hocko , Vlastimil Babka , Oscar Salvador , Pavel Tatashin , Mike Rapoport , Alexander Duyck , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , "David S . Miller" , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , "open list:MEMORY MANAGEMENT" , "linux-arm-kernel@lists.infradead.org" , "linux-s390@vger.kernel.org" , "sparclinux@vger.kernel.org" , "x86@kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-kernel@vger.kernel.org" , Open Source Submission SGkgVGhvbWFzLA0KDQoNCk9uIDcvMTUvMTkgMTE6NDMgQU0sIFRob21hcyBHbGVpeG5lciB3cm90 ZToNCj4gT24gVGh1LCAxMSBKdWwgMjAxOSwgSG9hbiBUcmFuIE9TIHdyb3RlOg0KPiANCj4+IFJl bW92ZSBDT05GSUdfTk9ERVNfU1BBTl9PVEhFUl9OT0RFUyBhcyBpdCdzIGVuYWJsZWQNCj4+IGJ5 IGRlZmF1bHQgd2l0aCBOVU1BLg0KPiANCj4gQXMgSSB0b2xkIHlvdSBiZWZvcmUgdGhpcyBkb2Vz IG5vdCBtZW50aW9uIHRoYXQgdGhlIG9wdGlvbiBpcyBub3cgZW5hYmxlZA0KPiBldmVuIGZvciB4 ODYoMzJiaXQpIGNvbmZpZ3VyYXRpb25zIHdoaWNoIGRpZCBub3QgZW5hYmxlIGl0IGJlZm9yZSBh bmQgZG9lcw0KPiBub3QgbG9uZ2VyIGRlcGVuZCBvbiBYODZfNjRfQUNQSV9OVU1BLg0KDQpBZ3Jl ZWQsIGxldCBtZSBhZGQgaXQgaW50byB0aGlzIHBhdGNoIGRlc2NyaXB0aW9uLg0KDQo+IA0KPiBB bmQgdGhlcmUgaXMgc3RpbGwgbm8gcmF0aW9uYWxlIHdoeSB0aGlzIG1ha2VzIHNlbnNlLg0KPiAN Cg0KQXMgd2Uga25vdyBhYm91dCB0aGUgbWVtbWFwX2luaXRfem9uZSgpIGZ1bmN0aW9uLCBpdCBp cyB1c2VkIHRvIA0KaW5pdGlhbGl6ZSBhbGwgcGFnZXMuIER1cmluZyBpbml0aWFsaXppbmcsIGVh cmx5X3Bmbl9pbl9uaWQoKSBmdW5jdGlvbiANCm1ha2VzIHN1cmUgdGhlIHBhZ2UgaXMgaW4gdGhl IHNhbWUgbm9kZSBpZC4gT3RoZXJ3aXNlLCANCm1lbW1hcF9pbml0X3pvbmUoKSBvbmx5IGNoZWNr cyB0aGUgcGFnZSB2YWxpZGl0eS4gSXQgd29uJ3Qgd29yayB3aXRoIA0Kbm9kZSBtZW1vcnkgc3Bh bnMgYWNyb3NzIHRoZSBvdGhlcnMuDQoNClRoZSBvcHRpb24gQ09ORklHX05PREVTX1NQQU5fT1RI RVJfTk9ERVMgaXMgb25seSB1c2VkIHRvIGVuYWJsZSANCmVhcmx5X3Bmbl9pbl9uaWQoKSBmdW5j dGlvbi4NCg0KSXQgb2NjdXJzIGR1cmluZyBib290LXRpbWUgYW5kIHdvbid0IGFmZmVjdCB0aGUg cnVuLXRpbWUgcGVyZm9ybWFuY2UuDQpBbmQgSSBzYXcgdGhlIG1ham9yaXR5IE5VTUEgYXJjaGl0 ZWN0dXJlcyBlbmFibGUgdGhpcyBvcHRpb24gYnkgZGVmYXVsdCANCndpdGggTlVNQS4NCg0KVGhh bmtzIGFuZCBSZWdhcmRzDQpIb2FuDQoNCg0KPiBUaGFua3MsDQo+IA0KPiAJdGdseA0KPiANCg== From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hoan Tran OS Date: Tue, 06 Aug 2019 16:47:12 +0000 Subject: Re: [PATCH v2 3/5] x86: Kconfig: Remove CONFIG_NODES_SPAN_OTHER_NODES Message-Id: <910accd6-c491-acfd-237a-97edec7c0b42@os.amperecomputing.com> List-Id: References: <1562887528-5896-1-git-send-email-Hoan@os.amperecomputing.com> <1562887528-5896-4-git-send-email-Hoan@os.amperecomputing.com> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Thomas Gleixner , Catalin Marinas , Will Deacon Cc: Michal Hocko , Benjamin Herrenschmidt , Heiko Carstens , "open list:MEMORY MANAGEMENT" , Paul Mackerras , "H . 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Tue, 6 Aug 2019 16:47:12 +0000 From: Hoan Tran OS To: Thomas Gleixner , Catalin Marinas , Will Deacon Subject: Re: [PATCH v2 3/5] x86: Kconfig: Remove CONFIG_NODES_SPAN_OTHER_NODES Thread-Topic: [PATCH v2 3/5] x86: Kconfig: Remove CONFIG_NODES_SPAN_OTHER_NODES Thread-Index: AQHVOD/6mMbG4b3xtkKwY5B+a64PmqbMCfcAgCJyqYA= Date: Tue, 6 Aug 2019 16:47:12 +0000 Message-ID: <910accd6-c491-acfd-237a-97edec7c0b42@os.amperecomputing.com> References: <1562887528-5896-1-git-send-email-Hoan@os.amperecomputing.com> <1562887528-5896-4-git-send-email-Hoan@os.amperecomputing.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: CY4PR1101CA0013.namprd11.prod.outlook.com (2603:10b6:910:15::23) To DM6PR01MB4090.prod.exchangelabs.com (2603:10b6:5:27::11) authentication-results: spf=none (sender IP is ) smtp.mailfrom=hoan@os.amperecomputing.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [4.28.12.214] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: c93d5fa5-ac1f-49fd-a8ac-08d71a8dbab7 x-microsoft-antispam: BCL:0; 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Peter Anvin" , "sparclinux@vger.kernel.org" , Alexander Duyck , "linux-s390@vger.kernel.org" , Michael Ellerman , "x86@kernel.org" , Mike Rapoport , Christian Borntraeger , Ingo Molnar , Vlastimil Babka , Open Source Submission , Pavel Tatashin , Vasily Gorbik , Borislav Petkov , "linux-arm-kernel@lists.infradead.org" , Oscar Salvador , "linux-kernel@vger.kernel.org" , Andrew Morton , "linuxppc-dev@lists.ozlabs.org" , "David S . Miller" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Thomas, On 7/15/19 11:43 AM, Thomas Gleixner wrote: > On Thu, 11 Jul 2019, Hoan Tran OS wrote: > >> Remove CONFIG_NODES_SPAN_OTHER_NODES as it's enabled >> by default with NUMA. > > As I told you before this does not mention that the option is now enabled > even for x86(32bit) configurations which did not enable it before and does > not longer depend on X86_64_ACPI_NUMA. Agreed, let me add it into this patch description. > > And there is still no rationale why this makes sense. > As we know about the memmap_init_zone() function, it is used to initialize all pages. During initializing, early_pfn_in_nid() function makes sure the page is in the same node id. Otherwise, memmap_init_zone() only checks the page validity. It won't work with node memory spans across the others. The option CONFIG_NODES_SPAN_OTHER_NODES is only used to enable early_pfn_in_nid() function. It occurs during boot-time and won't affect the run-time performance. And I saw the majority NUMA architectures enable this option by default with NUMA. Thanks and Regards Hoan > Thanks, > > tglx > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel