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([2a0c:5a80:3c10:3400:3c70:6643:6e71:7eae]) by smtp.gmail.com with ESMTPSA id s8sm3034920wro.19.2021.11.19.05.26.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Nov 2021 05:26:04 -0800 (PST) Message-ID: Subject: Re: [RFC PATCH 1/2] arm64/tracing: add cntvct based trace clock From: Nicolas Saenz Julienne To: Marc Zyngier , Marcelo Tosatti Cc: linux-arm-kernel@lists.infradead.org, rostedt@goodmis.org, james.morse@arm.com, alexandru.elisei@arm.com, suzuki.poulose@arm.com, catalin.marinas@arm.com, will@kernel.org, linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu, mingo@redhat.com, nilal@redhat.com Date: Fri, 19 Nov 2021 14:26:03 +0100 In-Reply-To: <87h7c873u0.wl-maz@kernel.org> References: <20211119102117.22304-1-nsaenzju@redhat.com> <20211119102117.22304-2-nsaenzju@redhat.com> <20211119112624.GA51423@fuller.cnet> <87h7c873u0.wl-maz@kernel.org> User-Agent: Evolution 3.42.1 (3.42.1-1.fc35) MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=nsaenzju@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211119_052611_113090_183737BC X-CRM114-Status: GOOD ( 19.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gRnJpLCAyMDIxLTExLTE5IGF0IDEyOjAwICswMDAwLCBNYXJjIFp5bmdpZXIgd3JvdGU6Cj4g T24gRnJpLCAxOSBOb3YgMjAyMSAxMToyNjoyNCArMDAwMCwKPiBNYXJjZWxvIFRvc2F0dGkgPG10 b3NhdHRpQHJlZGhhdC5jb20+IHdyb3RlOgo+ID4gCj4gPiBPbiBGcmksIE5vdiAxOSwgMjAyMSBh dCAxMToyMToxN0FNICswMTAwLCBOaWNvbGFzIFNhZW56IEp1bGllbm5lIHdyb3RlOgo+ID4gPiBB ZGQgYSBuZXcgYXJtNjQtc3BlY2lmaWMgdHJhY2UgY2xvY2sgdXNpbmcgdGhlIGNudHZjdCByZWdp c3Rlciwgc2ltaWxhcgo+ID4gPiB0byB4NjQtdHNjLiBUaGlzIGdpdmVzIHVzOgo+ID4gPiAgLSBB IGNsb2NrIHRoYXQgaXMgcmVsYXRpdmVseSBmYXN0ICgxR0h6IG9uIGFybXY4LjYsIDEtNTBNSHog b3RoZXJ3aXNlKSwKPiA+ID4gICAgbW9ub3RvbmljLCBhbmQgcmVzaWxpZW50IHRvIGxvdyBwb3dl ciBtb2Rlcy4KPiA+ID4gIC0gSXQgY2FuIGJlIHVzZWQgdG8gY29ycmVsYXRlIGV2ZW50cyBhY3Jv c3MgY3B1cyBhcyB3ZWxsIGFzIGFjcm9zcwo+ID4gPiAgICBoeXBlcnZpc29yIGFuZCBndWVzdHMu Cj4gPiA+IAo+ID4gPiBCeSB1c2luZyBhcmNoX3RpbWVyX3JlYWRfY291bnRlcigpIHdlIG1ha2Ug c3VyZSB0aGF0IGFybXY4LjYgY3B1cyB1c2UKPiA+ID4gdGhlIGxlc3MgZXhwZW5zaXZlIENOVFZD VFNTX0VMMCwgd2hpY2ggY2Fubm90IGJlIGFjY2Vzc2VkIHNwZWN1bGF0aXZlbHkuCj4gPiAKPiA+ IENhbiB0aGlzIHJlZ2lzdGVyIGJlIHJlYWQgYnkgdXNlcnNwYWNlID8gKG90aGVyd2lzZSBpdCB3 b24ndCBiZSBwb3NzaWJsZQo+ID4gdG8gY29ycmVsYXRlIHVzZXJzcGFjZSBldmVudHMpLgo+IAo+ IFllcy4gVGhhdCdzIHBhcnQgb2YgdGhlIHVzZXJzcGFjZSBBQkkuIEFsdGhvdWdoIHRoaXMgcGFy dGljdWxhcgo+IGFjY2Vzc29yIGlzIG9ubHkgYXZhaWxhYmxlIGZyb20gQVJNdjguNiBhbmQgaXMg YWR2ZXJ0aXNlZCB2aWEgYSBod2NhcAo+IHRvIHVzZXJzcGFjZS4KPiAKPiBGb3IgY3VycmVudGx5 IGV4aXN0aW5nIGltcGxlbWVudGF0aW9ucywgdXNlcnNwYWNlIHdpbGwgdXNlIHRoZQo+IENOVFZD VF9FTDAgYWNjZXNzb3IsIHdoaWNoIHJlcXVpcmVzIGV4dHJhIHN5bmNocm9uaXNhdGlvbiBhcyBp dCBjYW4gYmUKPiBzcGVjdWxhdGVkLgoKVG8gY29tcGxldGUgTWFyYydzIHJlcGx5LCBoZXJlJ3Mg YW4gZXhhbXBsZSBvZiBob3cgQ05UVkNUX0VMMCBpcyBiZWluZyB1c2VkIGluCnJ0LXRlc3RzJyBv c2xhdDoKCmh0dHBzOi8vZ2l0Lmtlcm5lbC5vcmcvcHViL3NjbS91dGlscy9ydC10ZXN0cy9ydC10 ZXN0cy5naXQvdHJlZS9zcmMvb3NsYXQvb3NsYXQuYyNuODcKCi0tIApOaWNvbMOhcyBTw6FlbnoK CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1h cm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5v cmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0t a2VybmVsCg==