From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Pasha Tatashin Subject: Re: [PATCH v4 3/5] mm: Defer ZONE_DEVICE page initialization to the point where we init pgmap Date: Fri, 21 Sep 2018 19:50:18 +0000 Message-ID: <2254cfe1-5cd3-eedc-1f24-8e011dcf3575@microsoft.com> References: <20180920215824.19464.8884.stgit@localhost.localdomain> <20180920222758.19464.83992.stgit@localhost.localdomain> In-Reply-To: <20180920222758.19464.83992.stgit@localhost.localdomain> Content-Language: en-US Content-Type: text/plain; charset="utf-8" Content-ID: <4F32675E3C009940AEFBAB1DADA60897@namprd21.prod.outlook.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 Sender: owner-linux-mm@kvack.org To: Alexander Duyck , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "linux-nvdimm@lists.01.org" Cc: "mhocko@suse.com" , "dave.jiang@intel.com" , "mingo@kernel.org" , "dave.hansen@intel.com" , "jglisse@redhat.com" , "akpm@linux-foundation.org" , "logang@deltatee.com" , "dan.j.williams@intel.com" , "kirill.shutemov@linux.intel.com" List-ID: DQoNCk9uIDkvMjAvMTggNjoyOSBQTSwgQWxleGFuZGVyIER1eWNrIHdyb3RlOg0KPiBUaGUgWk9O RV9ERVZJQ0UgcGFnZXMgd2VyZSBiZWluZyBpbml0aWFsaXplZCBpbiB0d28gbG9jYXRpb25zLiBP bmUgd2FzIHdpdGgNCj4gdGhlIG1lbW9yeV9ob3RwbHVnIGxvY2sgaGVsZCBhbmQgYW5vdGhlciB3 YXMgb3V0c2lkZSBvZiB0aGF0IGxvY2suIFRoZQ0KPiBwcm9ibGVtIHdpdGggdGhpcyBpcyB0aGF0 IGl0IHdhcyBuZWFybHkgZG91YmxpbmcgdGhlIG1lbW9yeSBpbml0aWFsaXphdGlvbg0KPiB0aW1l LiBJbnN0ZWFkIG9mIGRvaW5nIHRoaXMgdHdpY2UsIG9uY2Ugd2hpbGUgaG9sZGluZyBhIGdsb2Jh bCBsb2NrIGFuZA0KPiBvbmNlIHdpdGhvdXQsIEkgYW0gb3B0aW5nIHRvIGRlZmVyIHRoZSBpbml0 aWFsaXphdGlvbiB0byB0aGUgb25lIG91dHNpZGUgb2YNCj4gdGhlIGxvY2suIFRoaXMgYWxsb3dz IHVzIHRvIGF2b2lkIHNlcmlhbGl6aW5nIHRoZSBvdmVyaGVhZCBmb3IgbWVtb3J5IGluaXQNCj4g YW5kIHdlIGNhbiBpbnN0ZWFkIGZvY3VzIG9uIHBlci1ub2RlIGluaXQgdGltZXMuDQo+IA0KPiBP bmUgaXNzdWUgSSBlbmNvdW50ZXJlZCBpcyB0aGF0IGRldm1fbWVtcmVtYXBfcGFnZXMgYW5kDQo+ IGhtbV9kZXZtbWVtX3BhZ2VzX2NyZWF0ZSB3ZXJlIGluaXRpYWxpemluZyBvbmx5IHRoZSBwZ21h cCBmaWVsZCB0aGUgc2FtZQ0KPiB3YXkuIE9uZSB3YXNuJ3QgaW5pdGlhbGl6aW5nIGhtbV9kYXRh LCBhbmQgdGhlIG90aGVyIHdhcyBpbml0aWFsaXppbmcgaXQgdG8NCj4gYSBwb2lzb24gdmFsdWUu IFNpbmNlIHRoaXMgaXMgc29tZXRoaW5nIHRoYXQgaXMgZXhwb3NlZCB0byB0aGUgZHJpdmVyIGlu DQo+IHRoZSBjYXNlIG9mIGhtbSBJIGFtIG9wdGluZyBmb3IgYSB0aGlyZCBvcHRpb24gYW5kIGp1 c3QgaW5pdGlhbGl6aW5nDQo+IGhtbV9kYXRhIHRvIDAgc2luY2UgdGhpcyBpcyBnb2luZyB0byBi ZSBleHBvc2VkIHRvIHVua25vd24gdGhpcmQgcGFydHkNCj4gZHJpdmVycy4NCj4gDQo+IFNpZ25l ZC1vZmYtYnk6IEFsZXhhbmRlciBEdXljayA8YWxleGFuZGVyLmguZHV5Y2tAbGludXguaW50ZWwu Y29tPg0KDQo+ICt2b2lkIF9fcmVmIG1lbW1hcF9pbml0X3pvbmVfZGV2aWNlKHN0cnVjdCB6b25l ICp6b25lLA0KPiArCQkJCSAgIHVuc2lnbmVkIGxvbmcgc3RhcnRfcGZuLA0KPiArCQkJCSAgIHVu c2lnbmVkIGxvbmcgc2l6ZSwNCj4gKwkJCQkgICBzdHJ1Y3QgZGV2X3BhZ2VtYXAgKnBnbWFwKQ0K PiArew0KPiArCXVuc2lnbmVkIGxvbmcgcGZuLCBlbmRfcGZuID0gc3RhcnRfcGZuICsgc2l6ZTsN Cj4gKwlzdHJ1Y3QgcGdsaXN0X2RhdGEgKnBnZGF0ID0gem9uZS0+em9uZV9wZ2RhdDsNCj4gKwl1 bnNpZ25lZCBsb25nIHpvbmVfaWR4ID0gem9uZV9pZHgoem9uZSk7DQo+ICsJdW5zaWduZWQgbG9u ZyBzdGFydCA9IGppZmZpZXM7DQo+ICsJaW50IG5pZCA9IHBnZGF0LT5ub2RlX2lkOw0KPiArDQo+ ICsJaWYgKFdBUk5fT05fT05DRSghcGdtYXAgfHwgIWlzX2Rldl96b25lKHpvbmUpKSkNCj4gKwkJ cmV0dXJuOw0KPiArDQo+ICsJLyoNCj4gKwkgKiBUaGUgY2FsbCB0byBtZW1tYXBfaW5pdF96b25l IHNob3VsZCBoYXZlIGFscmVhZHkgdGFrZW4gY2FyZQ0KPiArCSAqIG9mIHRoZSBwYWdlcyByZXNl cnZlZCBmb3IgdGhlIG1lbW1hcCwgc28gd2UgY2FuIGp1c3QganVtcCB0bw0KPiArCSAqIHRoZSBl bmQgb2YgdGhhdCByZWdpb24gYW5kIHN0YXJ0IHByb2Nlc3NpbmcgdGhlIGRldmljZSBwYWdlcy4N Cj4gKwkgKi8NCj4gKwlpZiAocGdtYXAtPmFsdG1hcF92YWxpZCkgew0KPiArCQlzdHJ1Y3Qgdm1l bV9hbHRtYXAgKmFsdG1hcCA9ICZwZ21hcC0+YWx0bWFwOw0KPiArDQo+ICsJCXN0YXJ0X3BmbiA9 IGFsdG1hcC0+YmFzZV9wZm4gKyB2bWVtX2FsdG1hcF9vZmZzZXQoYWx0bWFwKTsNCj4gKwkJc2l6 ZSA9IGVuZF9wZm4gLSBzdGFydF9wZm47DQo+ICsJfQ0KPiArDQo+ICsJZm9yIChwZm4gPSBzdGFy dF9wZm47IHBmbiA8IGVuZF9wZm47IHBmbisrKSB7DQo+ICsJCXN0cnVjdCBwYWdlICpwYWdlID0g cGZuX3RvX3BhZ2UocGZuKTsNCj4gKw0KPiArCQlfX2luaXRfc2luZ2xlX3BhZ2UocGFnZSwgcGZu LCB6b25lX2lkeCwgbmlkKTsNCj4gKw0KPiArCQkvKg0KPiArCQkgKiBNYXJrIHBhZ2UgcmVzZXJ2 ZWQgYXMgaXQgd2lsbCBuZWVkIHRvIHdhaXQgZm9yIG9ubGluaW5nDQo+ICsJCSAqIHBoYXNlIGZv ciBpdCB0byBiZSBmdWxseSBhc3NvY2lhdGVkIHdpdGggYSB6b25lLg0KPiArCQkgKg0KPiArCQkg KiBXZSBjYW4gdXNlIHRoZSBub24tYXRvbWljIF9fc2V0X2JpdCBvcGVyYXRpb24gZm9yIHNldHRp bmcNCj4gKwkJICogdGhlIGZsYWcgYXMgd2UgYXJlIHN0aWxsIGluaXRpYWxpemluZyB0aGUgcGFn ZXMuDQo+ICsJCSAqLw0KPiArCQlfX1NldFBhZ2VSZXNlcnZlZChwYWdlKTsNCj4gKw0KPiArCQkv Kg0KPiArCQkgKiBaT05FX0RFVklDRSBwYWdlcyB1bmlvbiAtPmxydSB3aXRoIGEgLT5wZ21hcCBi YWNrDQo+ICsJCSAqIHBvaW50ZXIgYW5kIGhtbV9kYXRhLiAgSXQgaXMgYSBidWcgaWYgYSBaT05F X0RFVklDRQ0KPiArCQkgKiBwYWdlIGlzIGV2ZXIgZnJlZWQgb3IgcGxhY2VkIG9uIGEgZHJpdmVy LXByaXZhdGUgbGlzdC4NCj4gKwkJICovDQo+ICsJCXBhZ2UtPnBnbWFwID0gcGdtYXA7DQo+ICsJ CXBhZ2UtPmhtbV9kYXRhID0gMDsNCg0KX19pbml0X3NpbmdsZV9wYWdlKCkNCiAgbW1femVyb19z dHJ1Y3RfcGFnZSgpDQoNClRha2VzIGNhcmUgb2YgemVyb2luZywgbm8gbmVlZCB0byBkbyBhbm90 aGVyIHN0b3JlIGhlcmUuDQoNCg0KTG9va3MgZ29vZCBvdGhlcndpc2UuDQoNClJldmlld2VkLWJ5 OiBQYXZlbCBUYXRhc2hpbiA8cGF2ZWwudGF0YXNoaW5AbWljcm9zb2Z0LmNvbT4NCg==