Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
To:     Aaron Lu <aaron.lu@linux.alibaba.com>
Cc:     Julien Desfossez <jdesfossez@digitalocean.com>,
        Aubrey Li <aubrey.intel@gmail.com>,
        Subhra Mazumdar <subhra.mazumdar@oracle.com>,
        Vineeth Remanan Pillai <vpillai@digitalocean.com>,
        Nishanth Aravamudan <naravamudan@digitalocean.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Paul Turner <pjt@google.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        =?UTF-8?B?RnLDqWTDqXJpYyBXZWlzYmVja2Vy?= <fweisbec@gmail.com>,
        Kees Cook <keescook@chromium.org>,
        Greg Kerr <kerrnel@google.com>, Phil Auld <pauld@redhat.com>,
        Valentin Schneider <valentin.schneider@arm.com>,
        Mel Gorman <mgorman@techsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
        Paolo Bonzini <pbonzini@redhat.com>
References: <e8872bd9-1c6b-fb12-b535-3d37740a0306@linux.alibaba.com>
 <20190531210816.GA24027@sinkpad> <20190606152637.GA5703@sinkpad>
 <20190612163345.GB26997@sinkpad>
 <635c01b0-d8f3-561b-5396-10c75ed03712@oracle.com>
 <20190613032246.GA17752@sinkpad>
 <CAERHkrsMFjjBpPZS7jDhzbob4PSmiPj83OfqEeiKgaDAU3ajOA@mail.gmail.com>
 <20190619183302.GA6775@sinkpad> <20190718100714.GA469@aaronlu>
 <5f869512-3336-d9f0-6fff-e1150673a924@linux.intel.com>
 <20190719055238.GA536@aaronlu>
From:   Tim Chen <tim.c.chen@linux.intel.com>
Openpgp: preference=signencrypt
Autocrypt: addr=tim.c.chen@linux.intel.com; prefer-encrypt=mutual; keydata=
 mQINBE6ONugBEAC1c8laQ2QrezbYFetwrzD0v8rOqanj5X1jkySQr3hm/rqVcDJudcfdSMv0
 BNCCjt2dofFxVfRL0G8eQR4qoSgzDGDzoFva3NjTJ/34TlK9MMouLY7X5x3sXdZtrV4zhKGv
 3Rt2osfARdH3QDoTUHujhQxlcPk7cwjTXe4o3aHIFbcIBUmxhqPaz3AMfdCqbhd7uWe9MAZX
 7M9vk6PboyO4PgZRAs5lWRoD4ZfROtSViX49KEkO7BDClacVsODITpiaWtZVDxkYUX/D9OxG
 AkxmqrCxZxxZHDQos1SnS08aKD0QITm/LWQtwx1y0P4GGMXRlIAQE4rK69BDvzSaLB45ppOw
 AO7kw8aR3eu/sW8p016dx34bUFFTwbILJFvazpvRImdjmZGcTcvRd8QgmhNV5INyGwtfA8sn
 L4V13aZNZA9eWd+iuB8qZfoFiyAeHNWzLX/Moi8hB7LxFuEGnvbxYByRS83jsxjH2Bd49bTi
 XOsAY/YyGj6gl8KkjSbKOkj0IRy28nLisFdGBvgeQrvaLaA06VexptmrLjp1Qtyesw6zIJeP
 oHUImJltjPjFvyfkuIPfVIB87kukpB78bhSRA5mC365LsLRl+nrX7SauEo8b7MX0qbW9pg0f
 wsiyCCK0ioTTm4IWL2wiDB7PeiJSsViBORNKoxA093B42BWFJQARAQABtDRUaW0gQ2hlbiAo
 d29yayByZWxhdGVkKSA8dGltLmMuY2hlbkBsaW51eC5pbnRlbC5jb20+iQI+BBMBAgAoAhsD
 BgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAUCXFIuxAUJEYZe0wAKCRCiZ7WKota4STH3EACW
 1jBRzdzEd5QeTQWrTtB0Dxs5cC8/P7gEYlYQCr3Dod8fG7UcPbY7wlZXc3vr7+A47/bSTVc0
 DhUAUwJT+VBMIpKdYUbvfjmgicL9mOYW73/PHTO38BsMyoeOtuZlyoUl3yoxWmIqD4S1xV04
 q5qKyTakghFa+1ZlGTAIqjIzixY0E6309spVTHoImJTkXNdDQSF0AxjW0YNejt52rkGXXSoi
 IgYLRb3mLJE/k1KziYtXbkgQRYssty3n731prN5XrupcS4AiZIQl6+uG7nN2DGn9ozy2dgTi
 smPAOFH7PKJwj8UU8HUYtX24mQA6LKRNmOgB290PvrIy89FsBot/xKT2kpSlk20Ftmke7KCa
 65br/ExDzfaBKLynztcF8o72DXuJ4nS2IxfT/Zmkekvvx/s9R4kyPyebJ5IA/CH2Ez6kXIP+
 q0QVS25WF21vOtK52buUgt4SeRbqSpTZc8bpBBpWQcmeJqleo19WzITojpt0JvdVNC/1H7mF
 4l7og76MYSTCqIKcLzvKFeJSie50PM3IOPp4U2czSrmZURlTO0o1TRAa7Z5v/j8KxtSJKTgD
 lYKhR0MTIaNw3z5LPWCCYCmYfcwCsIa2vd3aZr3/Ao31ZnBuF4K2LCkZR7RQgLu+y5Tr8P7c
 e82t/AhTZrzQowzP0Vl6NQo8N6C2fcwjSrkCDQROjjboARAAx+LxKhznLH0RFvuBEGTcntrC
 3S0tpYmVsuWbdWr2ZL9VqZmXh6UWb0K7w7OpPNW1FiaWtVLnG1nuMmBJhE5jpYsi+yU8sbMA
 5BEiQn2hUo0k5eww5/oiyNI9H7vql9h628JhYd9T1CcDMghTNOKfCPNGzQ8Js33cFnszqL4I
 N9jh+qdg5FnMHs/+oBNtlvNjD1dQdM6gm8WLhFttXNPn7nRUPuLQxTqbuoPgoTmxUxR3/M5A
 KDjntKEdYZziBYfQJkvfLJdnRZnuHvXhO2EU1/7bAhdz7nULZktw9j1Sp9zRYfKRnQdIvXXa
 jHkOn3N41n0zjoKV1J1KpAH3UcVfOmnTj+u6iVMW5dkxLo07CddJDaayXtCBSmmd90OG0Odx
 cq9VaIu/DOQJ8OZU3JORiuuq40jlFsF1fy7nZSvQFsJlSmHkb+cDMZDc1yk0ko65girmNjMF
 hsAdVYfVsqS1TJrnengBgbPgesYO5eY0Tm3+0pa07EkONsxnzyWJDn4fh/eA6IEUo2JrOrex
 O6cRBNv9dwrUfJbMgzFeKdoyq/Zwe9QmdStkFpoh9036iWsj6Nt58NhXP8WDHOfBg9o86z9O
 VMZMC2Q0r6pGm7L0yHmPiixrxWdW0dGKvTHu/DH/ORUrjBYYeMsCc4jWoUt4Xq49LX98KDGN
 dhkZDGwKnAUAEQEAAYkCJQQYAQIADwIbDAUCXFIulQUJEYZenwAKCRCiZ7WKota4SYqUEACj
 P/GMnWbaG6s4TPM5Dg6lkiSjFLWWJi74m34I19vaX2CAJDxPXoTU6ya8KwNgXU4yhVq7TMId
 keQGTIw/fnCv3RLNRcTAapLarxwDPRzzq2snkZKIeNh+WcwilFjTpTRASRMRy9ehKYMq6Zh7
 PXXULzxblhF60dsvi7CuRsyiYprJg0h2iZVJbCIjhumCrsLnZ531SbZpnWz6OJM9Y16+HILp
 iZ77miSE87+xNa5Ye1W1ASRNnTd9ftWoTgLezi0/MeZVQ4Qz2Shk0MIOu56UxBb0asIaOgRj
 B5RGfDpbHfjy3Ja5WBDWgUQGgLd2b5B6MVruiFjpYK5WwDGPsj0nAOoENByJ+Oa6vvP2Olkl
 gQzSV2zm9vjgWeWx9H+X0eq40U+ounxTLJYNoJLK3jSkguwdXOfL2/Bvj2IyU35EOC5sgO6h
 VRt3kA/JPvZK+6MDxXmm6R8OyohR8uM/9NCb9aDw/DnLEWcFPHfzzFFn0idp7zD5SNgAXHzV
 PFY6UGIm86OuPZuSG31R0AU5zvcmWCeIvhxl5ZNfmZtv5h8TgmfGAgF4PSD0x/Bq4qobcfaL
 ugWG5FwiybPzu2H9ZLGoaRwRmCnzblJG0pRzNaC/F+0hNf63F1iSXzIlncHZ3By15bnt5QDk
 l50q2K/r651xphs7CGEdKi1nU0YJVbQxJQ==
Subject: Re: [RFC PATCH v3 00/16] Core scheduling v3
Message-ID: <cdfd7f2e-485e-0731-fcbf-6ce0bf4f5367@linux.intel.com>
Date:   Fri, 19 Jul 2019 11:33:03 -0700
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.6.1
MIME-Version: 1.0
In-Reply-To: <20190719055238.GA536@aaronlu>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 7/18/19 10:52 PM, Aaron Lu wrote:
> On Thu, Jul 18, 2019 at 04:27:19PM -0700, Tim Chen wrote:
>>
>>
>> On 7/18/19 3:07 AM, Aaron Lu wrote:
>>> On Wed, Jun 19, 2019 at 02:33:02PM -0400, Julien Desfossez wrote:
>>
>>>
>>> With the below patch on top of v3 that makes use of util_avg to decide
>>> which task win, I can do all 8 steps and the final scores of the 2
>>> workloads are: 1796191 and 2199586. The score number are not close,
>>> suggesting some unfairness, but I can finish the test now...
>>
>> Aaron,
>>
>> Do you still see high variance in terms of workload throughput that
>> was a problem with the previous version?
> 
> Any suggestion how to measure this?
> It's not clear how Aubrey did his test, will need to take a look at
> sysbench.
> 
>>>
>>>  
>>>  }
>>> +
>>> +bool cfs_prio_less(struct task_struct *a, struct task_struct *b)
>>> +{
>>> +	struct sched_entity *sea = &a->se;
>>> +	struct sched_entity *seb = &b->se;
>>> +	bool samecore = task_cpu(a) == task_cpu(b);
>>
>>
>> Probably "samecpu" instead of "samecore" will be more accurate.
>> I think task_cpu(a) and task_cpu(b)
>> can be different, but still belong to the same cpu core.
> 
> Right, definitely, guess I'm brain damaged.
> 
>>
>>> +	struct task_struct *p;
>>> +	s64 delta;
>>> +
>>> +	if (samecore) {
>>> +		/* vruntime is per cfs_rq */
>>> +		while (!is_same_group(sea, seb)) {
>>> +			int sea_depth = sea->depth;
>>> +			int seb_depth = seb->depth;
>>> +
>>> +			if (sea_depth >= seb_depth)
>>
>> Should this be strictly ">" instead of ">=" ?
> 
> Same depth doesn't necessarily mean same group while the purpose here is
> to make sure they are in the same cfs_rq. When they are of the same
> depth but in different cfs_rqs, we will continue to go up till we reach
> rq->cfs.

Ah, I see what you are doing now.  Thanks for the clarification.

Tim