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Thu, 12 Sep 2024 17:54:35 +0800 From: duchangbin To: Arnaldo Carvalho de Melo CC: James Clark , duchangbin , Mark Rutland , Alexander Shishkin , Jiri Olsa , "Ian Rogers" , Adrian Hunter , "Liang, Kan" , "linux-perf-users@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Peter Zijlstra , "Ingo Molnar" , Namhyung Kim Subject: Re: [PATCH v2] perf ftrace: Detect whether ftrace is enabled on system Thread-Topic: [PATCH v2] perf ftrace: Detect whether ftrace is enabled on system Thread-Index: AQHbBDGecvxeNbxUKk+LVH61YHizzLJR2IKAgAAl6wCAAeyYAA== Date: Thu, 12 Sep 2024 09:54:35 +0000 Message-ID: References: <20240911100126.900779-1-changbin.du@huawei.com> In-Reply-To: Accept-Language: en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-imapappendstamp: kwepemd100011.china.huawei.com (15.02.1258.034) x-ms-exchange-messagesentrepresentingtype: 1 Content-Type: text/plain; charset="utf-8" Content-ID: <046E3428A206EA478A8DFF5DBDAE3668@huawei.com> Content-Transfer-Encoding: base64 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 T24gV2VkLCBTZXAgMTEsIDIwMjQgYXQgMDk6MzE6MDJBTSAtMDMwMCwgQXJuYWxkbyBDYXJ2YWxo byBkZSBNZWxvIHdyb3RlOg0KPiBPbiBXZWQsIFNlcCAxMSwgMjAyNCBhdCAxMToxNToxOUFNICsw MTAwLCBKYW1lcyBDbGFyayB3cm90ZToNCj4gPiBPbiAxMS8wOS8yMDI0IDExOjAxLCBDaGFuZ2Jp biBEdSB3cm90ZToNCj4gPiA+IFRvIG1ha2UgZXJyb3IgbWVzc2FnZXMgbW9yZSBhY2N1cmF0ZSwg dGhpcyBjaGFuZ2UgZGV0ZWN0cyB3aGV0aGVyIGZ0cmFjZSBpcw0KPiA+ID4gZW5hYmxlZCBvbiBz eXN0ZW0gYnkgY2hlY2tpbmcgdHJhY2UgZmlsZSAic2V0X2Z0cmFjZV9waWQiLg0KPiANCj4gPFNO SVA+DQo+IA0KPiA+ID4gQEAgLTE1ODMsNiArMTYwMSwxMSBAQCBpbnQgY21kX2Z0cmFjZShpbnQg YXJnYywgY29uc3QgY2hhciAqKmFyZ3YpDQo+ID4gPiAgIAlpZiAoIWNoZWNrX2Z0cmFjZV9jYXBh YmxlKCkpDQo+ID4gPiAgIAkJcmV0dXJuIC0xOw0KPiA+ID4gKwlpZiAoIWlzX2Z0cmFjZV9zdXBw b3J0ZWQoKSkgew0KPiA+ID4gKwkJcHJfZXJyKCJmdHJhY2UgaXMgbm90IHN1cHBvcnRlZCBvbiB0 aGlzIHN5c3RlbVxuIik7DQo+ID4gPiArCQlyZXR1cm4gLUVOT1RTVVA7DQo+ID4gPiArCX0NCj4g PiA+ICsNCj4gPiA+ICAgCXJldCA9IHBlcmZfY29uZmlnKHBlcmZfZnRyYWNlX2NvbmZpZywgJmZ0 cmFjZSk7DQo+ID4gPiAgIAlpZiAocmV0IDwgMCkNCj4gPiA+ICAgCQlyZXR1cm4gLTE7DQo+ID4g DQo+ID4gUmV2aWV3ZWQtYnk6IEphbWVzIENsYXJrIDxqYW1lcy5jbGFya0BsaW5hcm8ub3JnPg0K PiANCj4gQXBwbGllZCBhbmQgYWRkZWQgdGhlc2UgY29tbWVudHM6DQo+IA0KPiBDb21taXR0ZXIg dGVzdGluZzoNCj4gDQo+IERvaW5nIGl0IGluIGFuIHVucHJpdmlsZWdlZCB0b29sYm94IGNvbnRh aW5lciBvbiBGZWRvcmEgNDA6DQo+IA0KPiBCZWZvcmU6DQo+IA0KPiAgIGFjbWVAbnVtYmVyOn4v Z2l0L3BlcmYtdG9vbHMtbmV4dCQgdG9vbGJveCBlbnRlciBwZXJmDQo+ICAg4qyiW2FjbWVAdG9v bGJveCBwZXJmLXRvb2xzLW5leHRdJCBzdWRvIHN1IC0NCj4gICDirKJbcm9vdEB0b29sYm94IH5d IyB+YWNtZS9iaW4vcGVyZiBmdHJhY2UNCj4gICBmYWlsZWQgdG8gcmVzZXQgZnRyYWNlDQo+ICAg 4qyiW3Jvb3RAdG9vbGJveCB+XSMNCj4gDQo+IEFmdGVyIHRoaXMgcGF0Y2g6DQo+IA0KPiAgIOKs oltyb290QHRvb2xib3ggfl0jIH5hY21lL2Jpbi9wZXJmIGZ0cmFjZQ0KPiAgIGZ0cmFjZSBpcyBu b3Qgc3VwcG9ydGVkIG9uIHRoaXMgc3lzdGVtDQo+ICAg4qyiW3Jvb3RAdG9vbGJveCB+XSMNCj4g DQo+IE1heWJlIHdlIGNvdWxkIGNoZWNrIGlmIHdlIGFyZSBpbiBzdWNoIGFzIHNpdHVhdGlvbiwg aW5zaWRlIGFuDQo+IHVucHJpdmlsZWdlZCBjb250YWluZXIsIGFuZCBwcm92aWRlIGEgSElOVCBs aW5lPw0KPiANCkkgdGhpbmsgd2UgY291bGQgY2hlY2sgdGhlIG1vdW50IHN0YXR1cyBvZiB0cmFj ZWZzIGZpcnN0LCBhbmQgdGhlbiBjaGVjayB3aGV0aGVyDQp0aGUgZnRyYWNlIG5vZGUgZXhpc3Rz LiBJZiB0aGVyZSdzIGEgcGVybWlzc2lvbiBpc3N1ZSBpbiBjb250YWluZXIsIG1heWJlIHdlDQpz aG91bGQgYWxzbyBjaGVjayB0aGUgZXJybm8gb2YgYWNjZXNzKCkuDQoNCj4gUmV2aWV3ZWQtYnk6 IEphbWVzIENsYXJrIDxqYW1lcy5jbGFya0BsaW5hcm8ub3JnPg0KPiBTaWduZWQtb2ZmLWJ5OiBD aGFuZ2JpbiBEdSA8Y2hhbmdiaW4uZHVAaHVhd2VpLmNvbT4NCj4gVGVzdGVkLWJ5OiBBcm5hbGRv IENhcnZhbGhvIGRlIE1lbG8gPGFjbWVAcmVkaGF0LmNvbT4NCg0KLS0gDQpDaGVlcnMsDQpDaGFu Z2JpbiBEdQ0K