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From: Joel Fernandes <joel@joelfernandes.org>
To: "benbjiang(蒋彪)" <benbjiang@tencent.com>
Cc: Nishanth Aravamudan <naravamudan@digitalocean.com>,
	Julien Desfossez <jdesfossez@digitalocean.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Tim Chen <tim.c.chen@linux.intel.com>,
	"mingo@kernel.org" <mingo@kernel.org>,
	"tglx@linutronix.de" <tglx@linutronix.de>,
	"pjt@google.com" <pjt@google.com>,
	"torvalds@linux-foundation.org" <torvalds@linux-foundation.org>,
	vpillai <vpillai@digitalocean.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"fweisbec@gmail.com" <fweisbec@gmail.com>,
	"keescook@chromium.org" <keescook@chromium.org>,
	"kerrnel@google.com" <kerrnel@google.com>,
	Phil Auld <pauld@redhat.com>, Aaron Lu <aaron.lwe@gmail.com>,
	Aubrey Li <aubrey.intel@gmail.com>,
	"aubrey.li@linux.intel.com" <aubrey.li@linux.intel.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>
Subject: Re: [PATCH RFC] sched: Add a per-thread core scheduling interface(Internet mail)
Date: Thu, 21 May 2020 09:49:13 -0400	[thread overview]
Message-ID: <20200521134913.GB140701@google.com> (raw)
In-Reply-To: <71B72E96-CD6E-43C3-B22B-ADE0EC78C550@tencent.com>

On Thu, May 21, 2020 at 04:09:50AM +0000, benbjiang(蒋彪) wrote:
> 
> 
> > On May 21, 2020, at 6:26 AM, Joel Fernandes (Google) <joel@joelfernandes.org> wrote:
> > 
> > Add a per-thread core scheduling interface which allows a thread to tag
> > itself and enable core scheduling. Based on discussion at OSPM with
> > maintainers, we propose a prctl(2) interface accepting values of 0 or 1.
> > 1 - enable core scheduling for the task.
> > 0 - disable core scheduling for the task.
> > 
> > Special cases:
> > (1)
> > The core-scheduling patchset contains a CGroup interface as well. In
> > order for us to respect users of that interface, we avoid overriding the
> > tag if a task was CGroup-tagged because the task becomes inconsistent
> > with the CGroup tag. Instead return -EBUSY.
> > 
> > (2)
> > If a task is prctl-tagged, allow the CGroup interface to override
> > the task's tag.
> > 
> > ChromeOS will use core-scheduling to securely enable hyperthreading.
> > This cuts down the keypress latency in Google docs from 150ms to 50ms
> > while improving the camera streaming frame rate by ~3%.
> Hi,
> Are the performance improvements compared to the hyperthreading disabled scenario or not?
> Could you help to explain how the keypress latency improvement comes with core-scheduling?

Hi Jiang,

The keypress end-to-end latency metric we have is calculated from when the
keypress is registered in hardware to when a character is drawn on the
scereen. This involves several parties including the GPU and browser
processes which are all running in the same trust domain and benefit from
parallelism through hyperthreading.

thanks,

 - Joel


  reply	other threads:[~2020-05-21 13:49 UTC|newest]

Thread overview: 115+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-04 16:59 [RFC PATCH 00/13] Core scheduling v5 vpillai
2020-03-04 16:59 ` [RFC PATCH 01/13] sched: Wrap rq::lock access vpillai
2020-03-04 16:59 ` [RFC PATCH 02/13] sched: Introduce sched_class::pick_task() vpillai
2020-03-04 16:59 ` [RFC PATCH 03/13] sched: Core-wide rq->lock vpillai
2020-04-01 11:42   ` [PATCH] sched/arm64: store cpu topology before notify_cpu_starting Cheng Jian
2020-04-01 13:23     ` Valentin Schneider
2020-04-01 13:23       ` Valentin Schneider
2020-04-06  8:00       ` chengjian (D)
2020-04-06  8:00         ` chengjian (D)
2020-04-09  9:59       ` Sudeep Holla
2020-04-09  9:59         ` Sudeep Holla
2020-04-09 10:32         ` Valentin Schneider
2020-04-09 10:32           ` Valentin Schneider
2020-04-09 11:08           ` Sudeep Holla
2020-04-09 11:08             ` Sudeep Holla
2020-04-09 17:54     ` Joel Fernandes
2020-04-10 13:49       ` chengjian (D)
2020-04-14 11:36   ` [RFC PATCH 03/13] sched: Core-wide rq->lock Peter Zijlstra
2020-04-14 21:35     ` Vineeth Remanan Pillai
2020-04-15 10:55       ` Peter Zijlstra
2020-04-14 14:32   ` Peter Zijlstra
2020-03-04 16:59 ` [RFC PATCH 04/13] sched/fair: Add a few assertions vpillai
2020-03-04 16:59 ` [RFC PATCH 05/13] sched: Basic tracking of matching tasks vpillai
2020-03-04 16:59 ` [RFC PATCH 06/13] sched: Update core scheduler queue when taking cpu online/offline vpillai
2020-03-04 16:59 ` [RFC PATCH 07/13] sched: Add core wide task selection and scheduling vpillai
2020-04-14 13:35   ` Peter Zijlstra
2020-04-16 23:32     ` Tim Chen
2020-04-17 10:57       ` Peter Zijlstra
2020-04-16  3:39   ` Chen Yu
2020-04-16 19:59     ` Vineeth Remanan Pillai
2020-04-17 11:18     ` Peter Zijlstra
2020-04-19 15:31       ` Chen Yu
2020-05-21 23:14   ` Joel Fernandes
2020-05-21 23:16     ` Joel Fernandes
2020-05-22  2:35     ` Joel Fernandes
2020-05-22  3:44       ` Aaron Lu
2020-05-22 20:13         ` Joel Fernandes
2020-03-04 16:59 ` [RFC PATCH 08/13] sched/fair: wrapper for cfs_rq->min_vruntime vpillai
2020-03-04 16:59 ` [RFC PATCH 09/13] sched/fair: core wide vruntime comparison vpillai
2020-04-14 13:56   ` Peter Zijlstra
2020-04-15  3:34     ` Aaron Lu
2020-04-15  4:07       ` Aaron Lu
2020-04-15 21:24         ` Vineeth Remanan Pillai
2020-04-17  9:40           ` Aaron Lu
2020-04-20  8:07             ` [PATCH updated] sched/fair: core wide cfs task priority comparison Aaron Lu
2020-04-20 22:26               ` Vineeth Remanan Pillai
2020-04-21  2:51                 ` Aaron Lu
2020-04-24 14:24                   ` [PATCH updated v2] " Aaron Lu
2020-05-06 14:35                     ` Peter Zijlstra
2020-05-08  8:44                       ` Aaron Lu
2020-05-08  9:09                         ` Peter Zijlstra
2020-05-08 12:34                           ` Aaron Lu
2020-05-14 13:02                             ` Peter Zijlstra
2020-05-14 22:51                               ` Vineeth Remanan Pillai
2020-05-15 10:38                                 ` Peter Zijlstra
2020-05-15 10:43                                   ` Peter Zijlstra
2020-05-15 14:24                                   ` Vineeth Remanan Pillai
2020-05-16  3:42                               ` Aaron Lu
2020-05-22  9:40                                 ` Aaron Lu
2020-06-08  1:41                               ` Ning, Hongyu
2020-03-04 17:00 ` [RFC PATCH 10/13] sched: Trivial forced-newidle balancer vpillai
2020-03-04 17:00 ` [RFC PATCH 11/13] sched: migration changes for core scheduling vpillai
2020-06-12 13:21   ` Joel Fernandes
2020-06-12 21:32     ` Vineeth Remanan Pillai
2020-06-13  2:25       ` Joel Fernandes
2020-06-13 18:59         ` Vineeth Remanan Pillai
2020-06-15  2:05           ` Li, Aubrey
2020-03-04 17:00 ` [RFC PATCH 12/13] sched: cgroup tagging interface " vpillai
2020-06-26 15:06   ` Vineeth Remanan Pillai
2020-03-04 17:00 ` [RFC PATCH 13/13] sched: Debug bits vpillai
2020-03-04 17:36 ` [RFC PATCH 00/13] Core scheduling v5 Tim Chen
2020-03-04 17:42   ` Vineeth Remanan Pillai
2020-04-14 14:21 ` Peter Zijlstra
2020-04-15 16:32   ` Joel Fernandes
2020-04-17 11:12     ` Peter Zijlstra
2020-04-17 12:35       ` Alexander Graf
2020-04-17 13:08         ` Peter Zijlstra
2020-04-18  2:25       ` Joel Fernandes
2020-05-09 14:35   ` Dario Faggioli
     [not found] ` <38805656-2e2f-222a-c083-692f4b113313@linux.intel.com>
2020-05-09  3:39   ` Ning, Hongyu
2020-05-14 20:51     ` FW: " Gruza, Agata
2020-05-10 23:46 ` [PATCH RFC] Add support for core-wide protection of IRQ and softirq Joel Fernandes (Google)
2020-05-11 13:49   ` Peter Zijlstra
2020-05-11 14:54     ` Joel Fernandes
2020-05-20 22:26 ` [PATCH RFC] sched: Add a per-thread core scheduling interface Joel Fernandes (Google)
2020-05-21  4:09   ` [PATCH RFC] sched: Add a per-thread core scheduling interface(Internet mail) benbjiang(蒋彪)
2020-05-21 13:49     ` Joel Fernandes [this message]
2020-05-21  8:51   ` [PATCH RFC] sched: Add a per-thread core scheduling interface Peter Zijlstra
2020-05-21 13:47     ` Joel Fernandes
2020-05-21 20:20       ` Vineeth Remanan Pillai
2020-05-22 12:59       ` Peter Zijlstra
2020-05-22 21:35         ` Joel Fernandes
2020-05-24 14:00           ` Phil Auld
2020-05-28 14:51             ` Joel Fernandes
2020-05-28 17:01             ` Peter Zijlstra
2020-05-28 18:17               ` Phil Auld
2020-05-28 18:34                 ` Phil Auld
2020-05-28 18:23               ` Joel Fernandes
2020-05-21 18:31   ` Linus Torvalds
2020-05-21 20:40     ` Joel Fernandes
2020-05-21 21:58       ` Jesse Barnes
2020-05-22 16:33         ` Linus Torvalds
2020-05-20 22:37 ` [PATCH RFC v2] Add support for core-wide protection of IRQ and softirq Joel Fernandes (Google)
2020-05-20 22:48 ` [PATCH RFC] sched: Use sched-RCU in core-scheduling balancing logic Joel Fernandes (Google)
2020-05-21 22:52   ` Paul E. McKenney
2020-05-22  1:26     ` Joel Fernandes
2020-06-25 20:12 ` [RFC PATCH 00/13] Core scheduling v5 Vineeth Remanan Pillai
2020-06-26  1:47   ` Joel Fernandes
2020-06-26 14:36     ` Vineeth Remanan Pillai
2020-06-26 15:10       ` Joel Fernandes
2020-06-26 15:12         ` Joel Fernandes
2020-06-27 16:21         ` Joel Fernandes
2020-06-30 14:11         ` Phil Auld
2020-06-29 12:33   ` Li, Aubrey
2020-06-29 19:41     ` Vineeth Remanan Pillai

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