From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C1E10C43217 for ; Thu, 14 Apr 2022 15:40:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243614AbiDNPi0 (ORCPT ); Thu, 14 Apr 2022 11:38:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34868 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350508AbiDNOWZ (ORCPT ); Thu, 14 Apr 2022 10:22:25 -0400 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.85.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 8B2551C122 for ; Thu, 14 Apr 2022 07:14:27 -0700 (PDT) Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mta-48-avZjpdW1Ouads2I4a0YvDg-1; Thu, 14 Apr 2022 15:14:24 +0100 X-MC-Unique: avZjpdW1Ouads2I4a0YvDg-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) by AcuMS.aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) with Microsoft SMTP Server (TLS) id 15.0.1497.32; Thu, 14 Apr 2022 15:14:22 +0100 Received: from AcuMS.Aculab.com ([fe80::994c:f5c2:35d6:9b65]) by AcuMS.aculab.com ([fe80::994c:f5c2:35d6:9b65%12]) with mapi id 15.00.1497.033; Thu, 14 Apr 2022 15:14:22 +0100 From: David Laight To: 'Vincent Guittot' CC: Qais Yousef , Dietmar Eggemann , "mingo@redhat.com" , "peterz@infradead.org" , "juri.lelli@redhat.com" , "rostedt@goodmis.org" , "bsegall@google.com" , "mgorman@suse.de" , "linux-kernel@vger.kernel.org" , "parth@linux.ibm.com" , "chris.hyser@oracle.com" , "pkondeti@codeaurora.org" , "Valentin.Schneider@arm.com" , "patrick.bellasi@matbug.net" , "pjt@google.com" , "pavel@ucw.cz" , "tj@kernel.org" , "qperret@google.com" , "tim.c.chen@linux.intel.com" , Wei Wang Subject: RE: Scheduling tasks on idle cpu Thread-Topic: Scheduling tasks on idle cpu Thread-Index: AdhNfEgLjonPVH3ESQeb3O9OCn/HMQAeBEWAABN1gYAAZKysEwAAL2fQAAKuEIAAB3al0A== Date: Thu, 14 Apr 2022 14:14:22 +0000 Message-ID: <5fc162f60ba84ab3a61992084d76c726@AcuMS.aculab.com> References: <030aacb0c1304e43ab917924dcf4f138@AcuMS.aculab.com> <20220411233447.rcencjivkhyltyxm@airbuntu> <4ca5cd70904d47bea0df93f7c0979c66@AcuMS.aculab.com> <20220413235719.xs72pm2kgihia46g@airbuntu> <2956e0e1bbfe4309a749ebb3c8736799@AcuMS.aculab.com> In-Reply-To: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogVmluY2VudCBHdWl0dG90DQo+IFNlbnQ6IDE0IEFwcmlsIDIwMjIgMTE6MTcNCi4uLg0K PiA+ID4gRGF2aWQgY2FuIHJlcnVuIGlzIHVzZSBjYXNlIGFmdGVyIGRpc2FibGluZyBzY2hlZF9m ZWF0KFNJU19QUk9QKQ0KPiA+DQo+ID4gSG93IHdvdWxkIEkgZG8gdGhhdD8NCj4gDQo+IGVjaG8g Tk9fU0lTX1BST1AgPiAvc3lzL2tlcm5lbC9kZWJ1Zy9zY2hlZC9mZWF0dXJlcw0KDQpUaGF0IG1h eSBub3QgYmUgaW4gdGhlIGtlcm5lbCBJJ20gdXNpbmcuDQoNCiMgY2F0IC9zeXMva2VybmVsL2Rl YnVnL3NjaGVkX2ZlYXR1cmVzDQpHRU5UTEVfRkFJUl9TTEVFUEVSUyBTVEFSVF9ERUJJVCBOT19O RVhUX0JVRERZIExBU1RfQlVERFkgQ0FDSEVfSE9UX0JVRERZIFdBS0VVUF9QUkVFTVBUSU9OIEFS Q0hfUE9XRVIgTk9fSFJUSUNLIE5PX0RPVUJMRV9USUNLIExCX0JJQVMgTk9OVEFTS19QT1dFUiBU VFdVX1FVRVVFIFJUX1JVTlRJTUVfU0hBUkUgTk9fTEJfTUlOIE5VTUEgTlVNQV9GQVZPVVJfSElH SEVSIE5PX05VTUFfUkVTSVNUX0xPV0VSDQoNCkkndmUgYmVlbiBsb29raW5nIGF0IGFub3RoZXIg ZnRyYWNlIG91dHB1dC4NClRoZSBzY2hlZHVsZXIgZG9lcyBsaWtlIG1pZ3JhdGluZyB0aGUgcHJv Y2VzcyB0byB0aGUgY3VycmVudCBjcHUuDQpJIGhhdmUgc2VlbiBpdCBtaWdyYXRlIGZyb20gb25l IGlkbGUgY3B1IHRvIGFub3RoZXIgaWRsZSBjcHUuDQpJJ3ZlIG5vdCBzZWVuIGl0IG1pZ3JhdGUg ZnJvbSBhbiBpZGxlIGNwdSB0byB0aGUgY3VycmVudCBjcHUuDQogIChCdXQgSSd2ZSBub3QgbG9v a2VkIGhhcmQuKQ0KDQpUaGVzZSBhcmUgYWxsIHRoZSBtaWdyYXRlczoNCiAgICBUaU5HIHRhc2s6 MTItMTAwNSAgWzAyNl0gZC4uLiAxMTExMDgxLjc5NjU2MDogc2NoZWRfbWlncmF0ZV90YXNrOiBj b21tPVJUUCBzb2NrZXRzIHBpZD05OTAgcHJpbz0xMjAgb3JpZ19jcHU9MTEgZGVzdF9jcHU9MTYN CiAgICBUaU5HIHRhc2s6MzEtMTAyNiAgWzAwNV0gZC4uLiAxMTExMDgxLjgzNjU1Njogc2NoZWRf bWlncmF0ZV90YXNrOiBjb21tPVJUUCBzb2NrZXRzIHBpZD05OTAgcHJpbz0xMjAgb3JpZ19jcHU9 MTYgZGVzdF9jcHU9MTENCiAgICBUaU5HIHRhc2s6MjgtMTAyMyAgWzAzM10gZC4uLiAxMTExMDgx Ljg1NjU4OTogc2NoZWRfbWlncmF0ZV90YXNrOiBjb21tPVJUUCBzb2NrZXRzIHBpZD05OTAgcHJp bz0xMjAgb3JpZ19jcHU9MTEgZGVzdF9jcHU9MzMNCiAgICBUaU5HIHRhc2s6MTEtMTAwNCAgWzAx M10gZC4uLiAxMTExMDgxLjg1NjYwNjogc2NoZWRfbWlncmF0ZV90YXNrOiBjb21tPVJUUCBzb2Nr ZXRzIHBpZD05OTAgcHJpbz0xMjAgb3JpZ19jcHU9MzMgZGVzdF9jcHU9MTMNCiAgICBUaU5HIHRh c2s6MTktMTAxMiAgWzAwMl0gZC4uLiAxMTExMDgxLjg5NjU2NDogc2NoZWRfbWlncmF0ZV90YXNr OiBjb21tPVJUUCBzb2NrZXRzIHBpZD05OTAgcHJpbz0xMjAgb3JpZ19jcHU9MTMgZGVzdF9jcHU9 MTANCiAgICBUaU5HIHRhc2s6MjYtMTAxOSAgWzAwOF0gZC4uLiAxMTExMDgxLjk1NjU1MTogc2No ZWRfbWlncmF0ZV90YXNrOiBjb21tPVJUUCBzb2NrZXRzIHBpZD05OTAgcHJpbz0xMjAgb3JpZ19j cHU9MTAgZGVzdF9jcHU9MTgNCiAgICBUaU5HIHRhc2s6MzQtMTAyOSAgWzAwMV0gZC4uLiAxMTEx MDgyLjAxNjUyNzogc2NoZWRfbWlncmF0ZV90YXNrOiBjb21tPVJUUCBzb2NrZXRzIHBpZD05OTAg cHJpbz0xMjAgb3JpZ19jcHU9MTggZGVzdF9jcHU9MQ0KICAgIFRpTkcgdGFzazoyMC0xMDEzICBb MDIxXSBkLi4uIDExMTEwODIuMDE2NTg5OiBzY2hlZF9taWdyYXRlX3Rhc2s6IGNvbW09UlRQIHNv Y2tldHMgcGlkPTk5MCBwcmlvPTEyMCBvcmlnX2NwdT0xIGRlc3RfY3B1PTIxDQogICAgVGlORyB0 YXNrOjMyLTEwMjcgIFswMDBdIGQuLi4gMTExMTA4Mi4wMzY0NTU6IHNjaGVkX21pZ3JhdGVfdGFz azogY29tbT1SVFAgc29ja2V0cyBwaWQ9OTkwIHByaW89MTIwIG9yaWdfY3B1PTIxIGRlc3RfY3B1 PTINCiAgICBUaU5HIHRhc2s6MTUtMTAwOCAgWzAwNl0gZC4uLiAxMTExMDgyLjA1NjUzOTogc2No ZWRfbWlncmF0ZV90YXNrOiBjb21tPVJUUCBzb2NrZXRzIHBpZD05OTAgcHJpbz0xMjAgb3JpZ19j cHU9MiBkZXN0X2NwdT0xNA0KICAgIFRpTkcgdGFzazozNC0xMDI5ICBbMDAxXSBkLi4uIDExMTEw ODIuMDc2NTM2OiBzY2hlZF9taWdyYXRlX3Rhc2s6IGNvbW09UlRQIHNvY2tldHMgcGlkPTk5MCBw cmlvPTEyMCBvcmlnX2NwdT0xNCBkZXN0X2NwdT0xDQogICAgVGlORyB0YXNrOjIxLTEwMTQgIFsw MDRdIGQuLi4gMTExMTA4Mi4wNzY1ODk6IHNjaGVkX21pZ3JhdGVfdGFzazogY29tbT1SVFAgc29j a2V0cyBwaWQ9OTkwIHByaW89MTIwIG9yaWdfY3B1PTEgZGVzdF9jcHU9NA0KICAgIFRpTkcgdGFz azoxMS0xMDA0ICBbMDEzXSBkLi4uIDExMTEwODIuMDk2NTI2OiBzY2hlZF9taWdyYXRlX3Rhc2s6 IGNvbW09UlRQIHNvY2tldHMgcGlkPTk5MCBwcmlvPTEyMCBvcmlnX2NwdT00IGRlc3RfY3B1PTEz DQogICAgVGlORyB0YXNrOjI4LTEwMjMgIFswMzNdIGQuLi4gMTExMTA4Mi4wOTY1ODQ6IHNjaGVk X21pZ3JhdGVfdGFzazogY29tbT1SVFAgc29ja2V0cyBwaWQ9OTkwIHByaW89MTIwIG9yaWdfY3B1 PTEzIGRlc3RfY3B1PTMzDQogICAgVGlORyB0YXNrOjI1LTEwMTggIFswMjldIGQuLi4gMTExMTA4 Mi4xMTY1NDk6IHNjaGVkX21pZ3JhdGVfdGFzazogY29tbT1SVFAgc29ja2V0cyBwaWQ9OTkwIHBy aW89MTIwIG9yaWdfY3B1PTMzIGRlc3RfY3B1PTExDQogICAgVGlORyB0YXNrOjI3LTEwMjAgIFsw MzJdIGQuLi4gMTExMTA4Mi4xNzY1MTk6IHNjaGVkX21pZ3JhdGVfdGFzazogY29tbT1SVFAgc29j a2V0cyBwaWQ9OTkwIHByaW89MTIwIG9yaWdfY3B1PTExIGRlc3RfY3B1PTE2DQpUaGVyZSBhcmUg YSBjb3VwbGUgb2YgcGxhY2VzIHdoZXJlIHRoZXJlIDIgd2FrZXVwcyBiZWZvcmUgdGhlIHNjaGVk dWxlLg0KVGhlIHNjaGVkdWxlciBkZWZpbml0ZWx5IGRvZXNuJ3QgbGlrZSB3YWtpbmcgdXAgYSBw cm9jZXNzIG9uIGFuIGV2ZW4gY3B1IGZyb20gb24gb2RkIG9uZS4NCkJ1dCB0aGVyZSBhcmUgYWxz byB0aGUgMTMtPjMzIGFuZCAxLT4yMSBvbmVzLg0KDQoJRGF2aWQNCg0KLQ0KUmVnaXN0ZXJlZCBB ZGRyZXNzIExha2VzaWRlLCBCcmFtbGV5IFJvYWQsIE1vdW50IEZhcm0sIE1pbHRvbiBLZXluZXMs IE1LMSAxUFQsIFVLDQpSZWdpc3RyYXRpb24gTm86IDEzOTczODYgKFdhbGVzKQ0K