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 75EABC433EF for ; Thu, 14 Apr 2022 08:35:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240984AbiDNIiH (ORCPT ); Thu, 14 Apr 2022 04:38:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43094 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241015AbiDNIhi (ORCPT ); Thu, 14 Apr 2022 04:37:38 -0400 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.86.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id C8B7562A1F for ; Thu, 14 Apr 2022 01:35:11 -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-319-DUXdtwJLPIq4rCnsMoqOfQ-1; Thu, 14 Apr 2022 09:35:08 +0100 X-MC-Unique: DUXdtwJLPIq4rCnsMoqOfQ-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 09:35:07 +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 09:35:07 +0100 From: David Laight To: 'Vincent Guittot' , Qais Yousef CC: 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/HMQAeBEWAABN1gYAAZKysEwAAL2fQ Date: Thu, 14 Apr 2022 08:35:07 +0000 Message-ID: <2956e0e1bbfe4309a749ebb3c8736799@AcuMS.aculab.com> References: <030aacb0c1304e43ab917924dcf4f138@AcuMS.aculab.com> <20220411233447.rcencjivkhyltyxm@airbuntu> <4ca5cd70904d47bea0df93f7c0979c66@AcuMS.aculab.com> <20220413235719.xs72pm2kgihia46g@airbuntu> 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+IFNlbnQ6IDE0IEFwcmlsIDIwMjIgMDg6NTQNCj4gDQo+ IE9uIFRodSwgMTQgQXByIDIwMjIgYXQgMDE6NTcsIFFhaXMgWW91c2VmIDxxYWlzLnlvdXNlZkBh cm0uY29tPiB3cm90ZToNCj4gPg0KPiA+IE9uIDA0LzEyLzIyIDExOjA3LCBWaW5jZW50IEd1aXR0 b3Qgd3JvdGU6DQo+ID4gPiBPbiBUdWUsIDEyIEFwciAyMDIyIGF0IDEwOjM5LCBEYXZpZCBMYWln aHQgPERhdmlkLkxhaWdodEBhY3VsYWIuY29tPiB3cm90ZToNCj4gPiA+ID4gWWVzIEkgd2FudCB0 aGUgQ0ZTIHNjaGVkdWxlciB0byBwaWNrIGFuIGlkbGUgY3B1IGluIHByZWZlcmVuY2UNCj4gPiA+ ID4gdG8gYW4gYWN0aXZlIFJUIG9uZS4NCj4gPiA+DQo+ID4gPiBXaGVuIHRhc2sgMzQ1MTIgd2Fr ZXMgdXAsIHNjaGVkdWxlciBjaGVja3MgaWYgcHJldiBvciB0aGlzIGNwdSBhcmUNCj4gPiA+IGlk bGUgd2hpY2ggaXMgbm90IHRoZSBjYXNlIGZvciB5b3UuIFRoZW4sIGl0IGNvbXBhcmVzIHRoZSBs b2FkIG9mIHByZXYNCj4gPiA+IGFuZCB0aGlzX2NwdSBhbmQgc2VlbXMgdG8gc2VsZWN0IHRoaXNf Y3B1IChjcHUxNykuDQo+ID4gPg0KPiA+ID4gT25jZSBjcHUxNyBzZWxlY3RlZCwgaXQgd2lsbCB0 cnkgdG8gZmluZCBhbiBpZGxlIGNwdSB3aGljaCBzaGFyZXMgTExDDQo+ID4gPiBidXQgaXQgc2Vl bXMgdGhhdCB0aGUgc2NoZWR1bGVyIGRpZG4ndCBmaW5kIG9uZSBhbmQgZmluYWxseSBrZWVwcyB0 YXNrDQo+ID4gPiAzNDUxMiBvbiB0aGlzX2NwdS4NCj4gPiA+DQo+ID4gPiBOb3RlIHRoYXQgZHVy aW5nIHRoZSBuZXh0IHRpY2ssIGEgbG9hZCBiYWxhbmNlIHdpbGwgYmUgdHJpZ2dlciBpZg0KPiA+ ID4gdGhpc19jcHUgc3RpbGwgaGF2ZSBib3RoIFJUIGFuZCB0YXNrIDM0NTEyLA0KPiA+DQo+ID4g RGF2aWQgc2FpZCB0aGVyZSBhcmUgaWRsZSBjcHVzDQo+ID4NCj4gPiAgICAgICAgICIgIFRoZXJl IGFyZSB0d28gcGh5c2ljYWwgY3B1IHdpdGggMjAgY29yZXMgZWFjaCAod2l0aCBoeXBlcnRocmVh ZGluZykuDQo+ID4gICAgICAgICAxNiwgMTgsIDM0LCAzNiBhbmQgMzggd2VyZSBpZGxlLiBTbyBi b3RoIDE2IGFuZCAxOCBzaG91bGQgYmUgb24gdGhlDQo+ID4gICAgICAgICBzYW1lIE5VTUEgbm9k ZS4gQWxsIHRoZSBvdGhlcnMgYXJlIHJ1bm5pbmcgdGhlIHNhbWUgUlQgdGhyZWFkIGNvZGUuICAi DQo+ID4NCj4gPiBFeGNlcHQgZm9yIHRoZSBwb3NzaWJpbGl0eSBvZiB0aGVtIGJlY29taW5nIGlk bGUganVzdCBhZnRlciB0aGUgdGFzayBoYXMgd29rZW4NCj4gPiB1cCwgc2hvdWxkbid0IG9uZSBv ZiB0aGVtIGhhdmUgYmVlbiBwaWNrZWQ/DQo+IA0KPiB3ZSBkb24ndCBsb29wIG9uIGFsbCBjcHVz IGluIHRoZSBMTEMgdG8gZmluZCBhbiBpZGxlIG9uZSBidXQgY29tcHV0ZSBhDQo+IHJlYXNvbmFi bGUgbnVtYmVyIG9mIGl0ZXJhdGlvbiBiYXNlZCBvbiB0aGUgYXZnX2lkbGUNCg0KSXMgdGhlcmUg YSB3YXkgdG8gZHVtcCB0aGUga2VybmVsIE5VTUEvTExDIHRhYmxlcz8NClRoaXMgbWlnaHQgYmUg cmVsZXZhbnQgKHdpdGggZXZlcnl0aGluZyBpZGxlKToNCiMgY2F0IC9wcm9jL3NjaGVkc3RhdA0K dmVyc2lvbiAxNQ0KdGltZXN0YW1wIDUzODg5ODkxOTMNCmNwdTAgMCAwIDAgMCAwIDAgMTE3MjI2 MDQxMzg0NTgyIDI1MDUzMTU2NTM1NCAyMDYyNzY4NzMNCmRvbWFpbjAgMDAsMDAxMDAwMDEgMCAw IDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAg MCAwIDAgMCAwIDANCmRvbWFpbjEgNTUsNTU1NTU1NTUgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAg MCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDANCmRvbWFpbjIg ZmYsZmZmZmZmZmYgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAw IDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDANCmNwdTEgMCAwIDAgMCAwIDAgMTE1OTc4NjYxMjg4 NzE4IDI1MTczNjkzMzgxNCAyOTcwOTMyODANCmRvbWFpbjAgMDAsMDAyMDAwMDIgMCAwIDAgMCAw IDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAg MCAwIDANCmRvbWFpbjEgYWEsYWFhYWFhYWEgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAg MCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDANCmRvbWFpbjIgZmYsZmZm ZmZmZmYgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAwIDAgMCAw IDAgMCAwIDAgMCAwIDAgMCAwIDANCkFsbCB0aGUgbGF0ZXIgY3B1IGZvbGxvdyB0aGUgc2FtZSBw YXR0ZXJuIChkb21haW4wIHNoaWZ0cyBsZWZ0IGV2ZXJ5IGNwdSkuDQoNCkkgY291bGQgaW50ZXJw cmV0IHRoYXQgYXMgbWVhbmluZzoNCmNwdSBuIGFuZCAobiArIDIwKSBhcmUgdGhlIGh5cGVydGhy ZWFkaW5nIHBhaXJzLg0KRXZlbiBudW1iZXJlZCBjcHUgYXJlIG9uIG9uZSBjaGlwLCBvZGQgbnVt YmVyZWQgb24gdGhlIG90aGVyLg0KDQpUaGUgbWlncmF0ZSB3YXM6DQogIDM0NTMzIFswMTddOiBz Y2hlZF9taWdyYXRlX3Rhc2s6IHBpZD0zNDUxMiBwcmlvPTEyMCBvcmlnX2NwdT0xNCBkZXN0X2Nw dT0xNw0KQWxsIHRoZSBpZGxlIGNwdSB3ZXJlIGV2ZW4uDQoNCj4gRGF2aWQgY2FuIHJlcnVuIGlz IHVzZSBjYXNlIGFmdGVyIGRpc2FibGluZyBzY2hlZF9mZWF0KFNJU19QUk9QKQ0KDQpIb3cgd291 bGQgSSBkbyB0aGF0Pw0KDQoJRGF2aWQNCg0KLQ0KUmVnaXN0ZXJlZCBBZGRyZXNzIExha2VzaWRl LCBCcmFtbGV5IFJvYWQsIE1vdW50IEZhcm0sIE1pbHRvbiBLZXluZXMsIE1LMSAxUFQsIFVLDQpS ZWdpc3RyYXRpb24gTm86IDEzOTczODYgKFdhbGVzKQ0K