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Tue, 8 Mar 2022 21:06:26 +0000 Received: from orsmsx611.amr.corp.intel.com ([10.22.229.24]) by ORSMSX611.amr.corp.intel.com ([10.22.229.24]) with mapi id 15.01.2308.021; Tue, 8 Mar 2022 13:06:24 -0800 From: "Hall, Christopher S" To: "Hunter, Adrian" , Peter Zijlstra CC: Alexander Shishkin , "Arnaldo Carvalho de Melo" , Jiri Olsa , "linux-kernel@vger.kernel.org" , "Thomas Gleixner" , Ingo Molnar , "Borislav Petkov" , Dave Hansen , "x86@kernel.org" , "kvm@vger.kernel.org" , H Peter Anvin , Mathieu Poirier , Suzuki K Poulose , "Leo Yan" , "jgross@suse.com" , "sdeep@vmware.com" , "pv-drivers@vmware.com" , "pbonzini@redhat.com" , "seanjc@google.com" , "kys@microsoft.com" , "sthemmin@microsoft.com" , "virtualization@lists.linux-foundation.org" , "Andrew.Cooper3@citrix.com" Subject: RE: [PATCH V2 03/11] perf/x86: Add support for TSC in nanoseconds as a perf event clock Thread-Topic: [PATCH V2 03/11] perf/x86: Add support for TSC in nanoseconds as a perf event clock Thread-Index: AQHYMjGQwHF+1jrIb0imwpV8b7O+FKy2EdUA///IiFA= Date: Tue, 8 Mar 2022 21:06:24 +0000 Message-ID: <6f07a7d4e1ad4440bf6c502c8cb6c2ed@intel.com> References: <20220214110914.268126-1-adrian.hunter@intel.com> <20220214110914.268126-4-adrian.hunter@intel.com> <853ce127-25f0-d0fe-1d8f-0b0dd4f3ce71@intel.com> <30383f92-59cb-2875-1e1b-ff1a0eacd235@intel.com> <013b5425-2a60-e4d4-b846-444a576f2b28@intel.com> In-Reply-To: <013b5425-2a60-e4d4-b846-444a576f2b28@intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-reaction: no-action dlp-version: 11.6.401.20 x-originating-ip: [10.22.254.132] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org QWRyaWFuIEh1bnRlciB3cm90ZToNCj4gT24gNy4zLjIwMjIgMTYuNDIsIFBldGVyIFppamxzdHJh IHdyb3RlOg0KPiA+IE9uIE1vbiwgTWFyIDA3LCAyMDIyIGF0IDAyOjM2OjAzUE0gKzAyMDAsIEFk cmlhbiBIdW50ZXIgd3JvdGU6DQo+ID4NCj4gPj4+IGRpZmYgLS1naXQgYS9hcmNoL3g4Ni9rZXJu ZWwvcGFyYXZpcnQuYyBiL2FyY2gveDg2L2tlcm5lbC9wYXJhdmlydC5jDQo+ID4+PiBpbmRleCA0 NDIwNDk5ZjdiYjQuLmExZjE3OWVkMzliZiAxMDA2NDQNCj4gPj4+IC0tLSBhL2FyY2gveDg2L2tl cm5lbC9wYXJhdmlydC5jDQo+ID4+PiArKysgYi9hcmNoL3g4Ni9rZXJuZWwvcGFyYXZpcnQuYw0K PiA+Pj4gQEAgLTE0NSw2ICsxNDUsMTUgQEAgREVGSU5FX1NUQVRJQ19DQUxMKHB2X3NjaGVkX2Ns b2NrLCBuYXRpdmVfc2NoZWRfY2xvY2spOw0KPiA+Pj4NCj4gPj4+ICB2b2lkIHBhcmF2aXJ0X3Nl dF9zY2hlZF9jbG9jayh1NjQgKCpmdW5jKSh2b2lkKSkNCj4gPj4+ICB7DQo+ID4+PiArCS8qDQo+ ID4+PiArCSAqIEFueXRoaW5nIHdpdGggQVJUIG9uIHByb21pc2VzIHRvIGhhdmUgc2FuZSBUU0Ms IG90aGVyd2lzZSB0aGUgd2hvbGUNCj4gPj4+ICsJICogQVJUIHRoaW5nIGlzIHVzZWxlc3MuIElu IG9yZGVyIHRvIG1ha2UgQVJUIHVzZWZ1bCBmb3IgZ3Vlc3RzLCB3ZQ0KPiA+Pj4gKwkgKiBzaG91 bGQgY29udGludWUgdG8gdXNlIHRoZSBUU0MuIEFzIHN1Y2gsIGlnbm9yZSBhbnkgcGFyYXZpcnQN Cj4gPj4+ICsJICogbXVja2VyeS4NCj4gPj4+ICsJICovDQo+ID4+PiArCWlmIChjcHVfZmVhdHVy ZV9lbmFibGVkKFg4Nl9GRUFUVVJFX0FSVCkpDQo+ID4+DQo+ID4+IERvZXMgbm90IHNlZW0gdG8g d29yayBiZWNhdXNlIHRoZSBmZWF0dXJlIFg4Nl9GRUFUVVJFX0FSVCBkb2VzIG5vdCBzZWVtIHRv IGdldCBzZXQuDQo+ID4+IFBvc3NpYmx5IGJlY2F1c2UgZGV0ZWN0X2FydCgpIGV4Y2x1ZGVzIGFu eXRoaW5nIHJ1bm5pbmcgb24gYSBoeXBlcnZpc29yLg0KPiA+DQo+ID4gU2ltcGxlIGVub3VnaCB0 byBkZWxldGUgdGhhdCBjbGF1c2UgSSBzdXBwb3NlLiBDaHJpc3RvcGhlciwgd2hhdCBpcw0KPiA+ IG5lZWRlZCB0byBtYWtlIHRoYXQgZ28gYXdheT8gSSBzdXBwb3NlIHRoZSBndWVzdCBuZWVkcyB0 byBiZSBhd2FyZSBvZg0KPiA+IHRoZSBhY3RpdmUgVFNDIHNjYWxpbmcgcGFyYW1ldGVycyB0byBt YWtlIGl0IHdvcmsgPw0KPiANCj4gVGhlcmUgaXMgYWxzbyBub3QgWDg2X0ZFQVRVUkVfTk9OU1RP UF9UU0Mgbm9yIHZhbHVlcyBmb3IgYXJ0X3RvX3RzY19kZW5vbWluYXRvcg0KPiBvciBhcnRfdG9f dHNjX251bWVyYXRvci4gIEFsc28sIGZyb20gdGhlIFZNJ3MgcG9pbnQgb2YgdmlldywgVFNDIHdp bGwganVtcA0KPiBmb3J3YXJkcyBldmVyeSBWTS1FeGl0IC8gVk0tRW50cnkgdW5sZXNzIHRoZSBo eXBlcnZpc29yIGNoYW5nZXMgdGhlIG9mZnNldA0KPiBldmVyeSBWTS1FbnRyeSwgd2hpY2ggS1ZN IGRvZXMgbm90LCBzbyBpdCBzdGlsbCBjYW5ub3QgYmUgdXNlZCBhcyBhIHN0YWJsZQ0KPiBjbG9j a3NvdXJjZS4NCg0KVHJhbnNsYXRpbmcgYmV0d2VlbiBBUlQgYW5kIHRoZSBndWVzdCBUU0MgY2Fu IGJlIGEgZGlmZmljdWx0IHByb2JsZW0gYW5kIEFSVCBzb2Z0d2FyZQ0Kc3VwcG9ydCBpcyBkaXNh YmxlZCBieSBkZWZhdWx0IGluIGEgVk0uDQoNClRoZXJlIGFyZSB0d28gbWFqb3IgaXNzdWVzIHRy YW5zbGF0aW5nIEFSVCB0byBUU0MgaW4gYSBWTToNCg0KVGhlIHJhbmdlIG9mIHRoZSBUU0Mgc2Nh bGluZyBmaWVsZCBpbiB0aGUgVk1DUyBpcyBtdWNoIGxhcmdlciB0aGFuIHRoZSByYW5nZSBvZiB2 YWx1ZXMNCnRoYXQgY2FuIGJlIHJlcHJlc2VudGVkIHVzaW5nIENQVUlEWzE1SF0sIGkuZS4sIGl0 IGlzIG5vdCBwb3NzaWJsZSB0byBjb21tdW5pY2F0ZSB0aGlzDQp0byB0aGUgVk0gdXNpbmcgdGhl IGN1cnJlbnQgQ1BVSUQgaW50ZXJmYWNlLiBUaGUgcmFuZ2Ugb2Ygc2NhbGluZyB3b3VsZCBuZWVk IHRvIGJlDQpyZXN0cmljdGVkIG9yIGFub3RoZXIgcGFyYS12aXJ0dWFsaXplZCBtZXRob2QgLSBw cmVmZXJhYmx5IE9TL2h5cGVydmlzb3IgYWdub3N0aWMgLSB0bw0KY29tbXVuaWNhdGUgdGhlIHNj YWxpbmcgZmFjdG9yIHRvIHRoZSBndWVzdCBuZWVkcyB0byBiZSBpbnZlbnRlZC4NCg0KVFNDIG9m ZnNldHRpbmcgbWF5IGFsc28gYmUgYSBwcm9ibGVtLiBUaGUgVk1DUyBUU0Mgb2Zmc2V0IG11c3Qg YmUgZGlzY292ZXJhYmxlIGJ5IHRoZQ0KZ3Vlc3QuIFRoaXMgY2FuIGJlIGRvbmUgdmlhIFRTQ19B REpVU1QgTVNSLiBUaGUgb2Zmc2V0IGluIHRoZSBWTUNTIGFuZCB0aGUgZ3Vlc3QNClRTQ19BREpV U1QgTVNSIG11c3QgYWx3YXlzIGJlIGVxdWl2YWxlbnQsIGkuZS4gYSB3cml0ZSB0byBUU0NfQURK VVNUIGluIHRoZSBndWVzdA0KbXVzdCBiZSByZWZsZWN0ZWQgaW4gdGhlIFZNQ1MgYW5kIGFueSBj aGFuZ2VzIHRvIHRoZSBvZmZzZXQgaW4gdGhlIFZNQ1MgbXVzdCBiZQ0KcmVmbGVjdGVkIGluIHRo ZSBUU0NfQURKVVNUIE1TUi4gT3RoZXJ3aXNlIGEgcGFyYS12aXJ0dWFsaXplZCBtZXRob2QgbXVz dA0KYmUgaW52ZW50ZWQgdG8gY29tbXVuaWNhdGUgYW4gYXJiaXRyYXJ5IFZNQ1MgVFNDIG9mZnNl dCB0byB0aGUgZ3Vlc3QuDQoNCg==