Received: by 2002:a05:6a10:a0d1:0:0:0:0 with SMTP id j17csp1979283pxa; Mon, 3 Aug 2020 04:28:15 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyAPKkpQBi80tlQgIRT3La/vuhmnJVr2F3RyfcAAu5dokbyp/rv6+q0o9e6+bcnIIIKAImo X-Received: by 2002:a05:6402:8cb:: with SMTP id d11mr7492341edz.100.1596454095355; Mon, 03 Aug 2020 04:28:15 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1596454095; cv=none; d=google.com; s=arc-20160816; b=0f9PvjobGYtRxCe9zhcxMwdRLSmeoaUwePwUXWO90NL2VZ+ltgRlh4uzQ9gpaBcw3i yF2Ve9o6l3zbE8oxn0C0UFPoG8v5NnzJeY7tuQThiaCFxXxlsoqrQ9aQmfz2McJ2deui FM4JUGgTa5TsgyZbPd6oy8WzCjYGGzay+NwZcwvjTDyAtpV2xQuek85cdHGocDzybOUk Lv77pNk+B9LVRFb6XGPeqDJLNvH7VRRbffLoL5XvpTk7k13+f3AWymwiDCuDeLW518H4 lgqyjFQjYsTL4Hli83bInY04/rAzWjOGpkOxrrNAygFz3XIUVHaYzC2L5YQ11xH8GyS6 Ahsw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:content-transfer-encoding :content-id:content-language:accept-language:in-reply-to:references :message-id:date:thread-index:thread-topic:subject:cc:to:from :dkim-signature; bh=4gxuggMWH3oY8UWgheEK+vbB9l6Q89rn27r+LIz3pM8=; b=btKeZStE28jpH8UYTrgw/0u0WPttkjwK3AML9tSPfkju7NqcdM4MH+X6gCxcHchfj9 cYr7aKyRra9M1yAtDCpc+9WRws+0yEdx0AZqWEQi1aK3ScdvqI8wMSl6PDU4vF7X7c6I p5wgHIbepVbDJ/4TpSfXmVBbGJzsy1IxQObmmLSrUSe7qLXGzYMDFoaoHcGJ8jJVmO29 q1JZU180+SMkx/lc9wDmDkLv72fQ/L220XM14ODzwJNROxqXeTnTWdHt8SlajUB6t8Vy i8mo++yDgAVzd3jvqCUq3tadUONgaWZBeVXMoW3bpNB7CYEFyogXmnAPySD5VIyHpDN8 9gCQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@tencent.com header.s=s202002 header.b=nOXDzZ7z; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=tencent.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id s15si10115157eji.64.2020.08.03.04.27.52; Mon, 03 Aug 2020 04:28:15 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@tencent.com header.s=s202002 header.b=nOXDzZ7z; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=tencent.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726356AbgHCL0g (ORCPT + 99 others); Mon, 3 Aug 2020 07:26:36 -0400 Received: from mail4.tencent.com ([183.57.53.109]:37196 "EHLO mail4.tencent.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725945AbgHCL0f (ORCPT ); Mon, 3 Aug 2020 07:26:35 -0400 Received: from EX-SZ022.tencent.com (unknown [10.28.6.88]) by mail4.tencent.com (Postfix) with ESMTP id 40D4772527; Mon, 3 Aug 2020 19:26:30 +0800 (CST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=tencent.com; s=s202002; t=1596453990; bh=4gxuggMWH3oY8UWgheEK+vbB9l6Q89rn27r+LIz3pM8=; h=From:To:CC:Subject:Date:References:In-Reply-To; b=nOXDzZ7z5wYEGoByDmwqUp4Fo0uICXe5aBA8JoGagdRBr2Wd77q64q5iTWC0CQ+4U +93QXAIo0EQWxg6Zsoh5sSnRYYqNm9dZ64HSehcb1q6AfZhKVV3v001Ya8R4We6zZd 3c8udd6aaQB/yo7nj+EGIvdsvkcXHB4MWeOCwL4o= Received: from EX-SZ003.tencent.com (10.28.6.15) by EX-SZ022.tencent.com (10.28.6.88) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1847.3; Mon, 3 Aug 2020 19:26:30 +0800 Received: from EX-SZ012.tencent.com (10.28.6.36) by EX-SZ003.tencent.com (10.28.6.15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1847.3; Mon, 3 Aug 2020 19:26:29 +0800 Received: from EX-SZ012.tencent.com ([fe80::f57b:8971:e6d4:fe6b]) by EX-SZ012.tencent.com ([fe80::f57b:8971:e6d4:fe6b%3]) with mapi id 15.01.1847.007; Mon, 3 Aug 2020 19:26:29 +0800 From: =?utf-8?B?YmVuYmppYW5nKOiSi+W9qik=?= To: Dietmar Eggemann CC: Jiang Biao , "mingo@redhat.com" , "peterz@infradead.org" , "juri.lelli@redhat.com" , "vincent.guittot@linaro.org" , "rostedt@goodmis.org" , "bsegall@google.com" , "mgorman@suse.de" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] sched/fair: reduce preemption with IDLE tasks runable(Internet mail) Thread-Topic: [PATCH] sched/fair: reduce preemption with IDLE tasks runable(Internet mail) Thread-Index: AQHWZ6wckGsZD+WUv0OJdOJkfcOxRKklh1uAgAA1DAA= Date: Mon, 3 Aug 2020 11:26:29 +0000 Message-ID: <592F24A7-BF43-457D-AC40-DC5E35279730@tencent.com> References: <20200801023248.90104-1-benbjiang@gmail.com> <5ed0fd46-3a3d-3c1a-5d75-03a74864e640@arm.com> In-Reply-To: <5ed0fd46-3a3d-3c1a-5d75-03a74864e640@arm.com> Accept-Language: zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.28.2.15] Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org DQoNCj4gT24gQXVnIDMsIDIwMjAsIGF0IDQ6MTYgUE0sIERpZXRtYXIgRWdnZW1hbm4gPGRpZXRt YXIuZWdnZW1hbm5AYXJtLmNvbT4gd3JvdGU6DQo+IA0KPiBPbiAwMS8wOC8yMDIwIDA0OjMyLCBK aWFuZyBCaWFvIHdyb3RlOg0KPj4gRnJvbTogSmlhbmcgQmlhbyA8YmVuYmppYW5nQHRlbmNlbnQu Y29tPg0KPj4gDQo+PiBObyBuZWVkIHRvIHByZWVtcHQgd2hlbiB0aGVyZSBhcmUgb25seSBvbmUg cnVuYWJsZSBDRlMgdGFzayB3aXRoDQo+PiBvdGhlciBJRExFIHRhc2tzIG9uIHJ1bnF1ZXVlLiBU aGUgb25seSBvbmUgQ0ZTIHRhc2sgd291bGQgYWx3YXlzDQo+PiBiZSBwaWNrZWQgaW4gdGhhdCBj YXNlLg0KPj4gDQo+PiBTaWduZWQtb2ZmLWJ5OiBKaWFuZyBCaWFvIDxiZW5iamlhbmdAdGVuY2Vu dC5jb20+DQo+PiAtLS0NCj4+IGtlcm5lbC9zY2hlZC9mYWlyLmMgfCAyICstDQo+PiAxIGZpbGUg Y2hhbmdlZCwgMSBpbnNlcnRpb24oKyksIDEgZGVsZXRpb24oLSkNCj4+IA0KPj4gZGlmZiAtLWdp dCBhL2tlcm5lbC9zY2hlZC9mYWlyLmMgYi9rZXJuZWwvc2NoZWQvZmFpci5jDQo+PiBpbmRleCAw NGZhOGRiY2ZhNGQuLjhmYjgwNjM2YjAxMCAxMDA2NDQNCj4+IC0tLSBhL2tlcm5lbC9zY2hlZC9m YWlyLmMNCj4+ICsrKyBiL2tlcm5lbC9zY2hlZC9mYWlyLmMNCj4+IEBAIC00NTI3LDcgKzQ1Mjcs NyBAQCBlbnRpdHlfdGljayhzdHJ1Y3QgY2ZzX3JxICpjZnNfcnEsIHN0cnVjdCBzY2hlZF9lbnRp dHkgKmN1cnIsIGludCBxdWV1ZWQpDQo+PiAJCXJldHVybjsNCj4+ICNlbmRpZg0KPj4gDQo+PiAt CWlmIChjZnNfcnEtPm5yX3J1bm5pbmcgPiAxKQ0KPj4gKwlpZiAoY2ZzX3JxLT5ucl9ydW5uaW5n ID4gY2ZzX3JxLmlkbGVfaF9ucl9ydW5uaW5nICsgMSkNCj4gDQo+IGNmc19ycSBpcyBhIHBvaW50 ZXIuDQpJdCBpcy4gU29ycnkgYWJvdXQgdGhhdC4gOikNCg0KPiANCj4+IAkJY2hlY2tfcHJlZW1w dF90aWNrKGNmc19ycSwgY3Vycik7DQo+PiB9DQo+IA0KPiBZb3UgY2FuJ3QgY29tcGFyZSBjZnNf cnEtPm5yX3J1bm5pbmcgd2l0aCBjZnNfcnEtPmlkbGVfaF9ucl9ydW5uaW5nIQ0KPiANCj4gVGhl cmUgaXMgYSBkaWZmZXJlbmNlIGJldHdlZW4gY2ZzX3JxLT5oX25yX3J1bm5pbmcgYW5kDQo+IGNm c19ycS0+bnJfcnVubmluZy4gVGhlICdfaF8nIHN0YW5kcyBmb3IgaGllcmFyY2hpY2FsLg0KPiAN Cj4gVGhlIGZvcm1lciBnaXZlcyB5b3UgaGllcmFyY2hpY2FsIHRhc2sgYWNjb3VudGluZyB3aGVy ZWFzIHRoZSBsYXR0ZXIgaXMNCj4gdGhlIG51bWJlciBvZiBzY2hlZCBlbnRpdGllcyAocmVwcmVz ZW50aW5nIHRhc2tzIG9yIHRhc2tncm91cHMpIGVucXVldWVkDQo+IGluIGNmc19ycS4NCj4gDQo+ IEluIGVudGl0eV90aWNrKCksIGNmc19ycS0+bnJfcnVubmluZyBoYXMgdG8gYmUgdXNlZCBmb3Ig dGhlIGNvbmRpdGlvbiB0bw0KPiBjYWxsIGNoZWNrX3ByZWVtcHRfdGljaygpLiBXZSB3YW50IHRv IGNoZWNrIGlmIGN1cnIgaGFzIHRvIGJlIHByZWVtcHRlZA0KPiBieSBfX3BpY2tfZmlyc3RfZW50 aXR5KGNmc19ycSkgb24gdGhpcyBjZnNfcnEuDQo+IA0KPiBlbnRpdHlfdGljaygpIGlzIGNhbGxl ZCBmb3IgZWFjaCBzY2hlZCBlbnRpdHkgKGFuZCBzbyBmb3IgZWFjaA0KPiBjZnNfcnFfb2Yoc2Up KSBvZiB0aGUgdGFzayBncm91cCBoaWVyYXJjaHkgKGUuZy4gdGFzayBwIHJ1bm5pbmcgaW4NCj4g dGFza2dyb3VwIC9BL0IgOiBzZShwKSAtPiBzZShBL0IpIC0+IHNlKEEpKS4NClRoYXTigJlzIHRy dWUuIEkgd2FzIHRoaW5raW5nIGFkZGluZyBhIG5ldyBjZnNfcnEtPmlkbGVfbnJfcnVubmluZyBt ZW1iZXIgdG8NCnRyYWNrIHRoZSBwZXIgY2ZzX3JxJ3MgSURMRSB0YXNrIG51bWJlciwgYW5kIHJl ZHVjaW5nIHByZWVtcHRpb24gaGVyZSBiYXNlZA0Kb24gdGhhdC4gDQpJ4oCZbSBub3Qgc3VyZSBp ZiBpdOKAmXMgb2sgdG8gZG8gdGhhdCwgYmVjYXVzZSB0aGUgSURMRSBjbGFzcyBzZWVtcyBub3Qg dG8gYmUgc28NCnB1cmUgdGhhdCBjb3VsZCB0b2xlcmF0ZSBzdGFydmluZy4NCldlIG5lZWQgYW4g YWJzb2x1dGVseSBsb3cgcHJpb3JpdHkgY2xhc3MgdGhhdCBjb3VsZCB0b2xlcmF0ZSBzdGFydmlu Zywgd2hpY2gNCmNvdWxkIGJlIHVzZWQgdG8gY28tbG9jYXRlIG9mZmxpbmUgdGFza3MuIEJ1dCBJ RExFIGNsYXNzIHNlZW1zIHRvIGJlIG5vdA0KKmxvdyogZW5vdWdoLCBpZiBjb25zaWRlcmluZyB0 aGUgZmFpcm5lc3Mgb2YgQ0ZTLCBhbmQgSURMRSBjbGFzcyBzdGlsbCBoYXMgYQ0Kd2VpZ2h0Lg0K DQpUaGFua3MgZm9yIHlvdSByZXBseS4NCg0KUmVnYXJkcywNCkppYW5n