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From: Dario Faggioli <dfaggioli@suse.com>
To: Greg Kerr <kerrnel@chromium.org>,
	Vineeth Remanan Pillai <vpillai@digitalocean.com>
Cc: "Phil Auld" <pauld@redhat.com>,
	"Nishanth Aravamudan" <naravamudan@digitalocean.com>,
	"Julien Desfossez" <jdesfossez@digitalocean.com>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Tim Chen" <tim.c.chen@linux.intel.com>,
	"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>,
	"Frédéric Weisbecker" <fweisbec@gmail.com>,
	"Kees Cook" <keescook@chromium.org>,
	"Aaron Lu" <aaron.lwe@gmail.com>,
	"Aubrey Li" <aubrey.intel@gmail.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: [RFC PATCH v4 00/19] Core scheduling v4
Date: Fri, 01 Nov 2019 19:07:59 +0100	[thread overview]
Message-ID: <b0bc6ad6c485117731f715a00992c0e414ba8b85.camel@suse.com> (raw)
In-Reply-To: <CAJGSLMtnxSqKvu3C7WQhMUUbzRXmfU1MVyLz8GcAQcAscdaZdw@mail.gmail.com>

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On Fri, 2019-11-01 at 09:35 -0700, Greg Kerr wrote:
> Has anyone considering shipping a V1 implementation which just allows
> threads from the same process to share a core together? And then
> iterating on that? Would that be simpler to implement or do the same
> fundamental problems exist as tagging arbitrary processes with
> cookies?
> 
IMO, the latter, i.e., the same fundamental problem exist.

It's _tasks_ having to be scheduled in a certain way.

It does not matter much, as far as the necessary modifications to the
scheduler are concerned, whether those tasks are independent processes,
or threads or the same process, or vcpus of a VMs, etc...

Regards
-- 
Dario Faggioli, Ph.D
http://about.me/dario.faggioli
Virtualization Software Engineer
SUSE Labs, SUSE https://www.suse.com/
-------------------------------------------------------------------
<<This happens because _I_ choose it to happen!>> (Raistlin Majere)


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  reply	other threads:[~2019-11-01 18:08 UTC|newest]

Thread overview: 84+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-30 18:33 [RFC PATCH v4 00/19] Core scheduling v4 Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 01/19] stop_machine: Fix stop_cpus_in_progress ordering Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 02/19] sched: Fix kerneldoc comment for ia64_set_curr_task Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 03/19] sched: Wrap rq::lock access Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 04/19] sched/{rt,deadline}: Fix set_next_task vs pick_next_task Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 05/19] sched: Add task_struct pointer to sched_class::set_curr_task Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 06/19] sched/fair: Export newidle_balance() Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 07/19] sched: Allow put_prev_task() to drop rq->lock Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 08/19] sched: Rework pick_next_task() slow-path Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 09/19] sched: Introduce sched_class::pick_task() Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 10/19] sched: Core-wide rq->lock Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 11/19] sched: Basic tracking of matching tasks Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 12/19] sched: A quick and dirty cgroup tagging interface Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 13/19] sched: Add core wide task selection and scheduling Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 14/19] sched/fair: Add a few assertions Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 15/19] sched: Trivial forced-newidle balancer Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 16/19] sched: Debug bits Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 17/19] sched/fair: wrapper for cfs_rq->min_vruntime Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 18/19] sched/fair: core wide vruntime comparison Vineeth Remanan Pillai
2019-10-30 18:33 ` [RFC PATCH v4 19/19] sched/fair : Wake up forced idle siblings if needed Vineeth Remanan Pillai
2019-10-31 11:42 ` [RFC PATCH v4 00/19] Core scheduling v4 Li, Aubrey
2019-11-01 11:33   ` Li, Aubrey
2019-11-08  3:20     ` Li, Aubrey
2019-10-31 18:42 ` Phil Auld
2019-11-01 14:03   ` Vineeth Remanan Pillai
2019-11-01 16:35     ` Greg Kerr
2019-11-01 18:07       ` Dario Faggioli [this message]
2019-11-12  1:45     ` Dario Faggioli
2019-11-13 17:16       ` Tim Chen
2020-01-02  2:28       ` Aubrey Li
2020-01-10 23:19         ` Tim Chen
2019-11-11 19:10 ` Tim Chen
2020-01-14  1:12   ` Tim Chen
2020-01-14 15:40     ` Vineeth Remanan Pillai
2020-01-15  3:43       ` Li, Aubrey
2020-01-15 19:33         ` Tim Chen
2020-01-16  1:45           ` Aubrey Li
2020-01-17 16:00             ` Vineeth Remanan Pillai
2020-01-22 18:04               ` Gruza, Agata
2020-01-28  2:40       ` Dario Faggioli
     [not found]         ` <CANaguZDDpzrzdTmvjXvCmV2c+wBt6mXWSz4Vn-LJ-onc_Oj=yw@mail.gmail.com>
2020-02-01 15:31           ` Dario Faggioli
2020-02-06  0:28       ` Tim Chen
2020-02-06 22:37         ` Julien Desfossez
2020-02-12 23:07         ` Julien Desfossez
2020-02-13 18:37           ` Tim Chen
2020-02-14  6:10             ` Aubrey Li
     [not found]               ` <CANaguZC40mDHfL1H_9AA7H8cyd028t9PQVRqQ3kB4ha8R7hhqg@mail.gmail.com>
2020-02-15  6:01                 ` Aubrey Li
     [not found]                   ` <CANaguZBj_x_2+9KwbHCQScsmraC_mHdQB6uRqMTYMmvhBYfv2Q@mail.gmail.com>
2020-02-21 23:20                     ` Julien Desfossez
2020-03-17  0:55                       ` Joel Fernandes
2020-03-17 19:07                         ` Tim Chen
2020-03-17 20:18                           ` Tim Chen
2020-03-18  1:10                             ` Joel Fernandes
2020-03-17 21:17                           ` Thomas Gleixner
2020-03-17 21:58                             ` Tim Chen
2020-03-18  1:03                             ` Joel Fernandes
2020-03-18  2:30                               ` Joel Fernandes
2020-03-18  0:52                           ` Joel Fernandes
2020-03-18 11:53                             ` Thomas Gleixner
2020-03-19  1:54                               ` Joel Fernandes
2020-02-25  3:44               ` Aaron Lu
2020-02-25  5:32                 ` Aubrey Li
2020-02-25  7:34                   ` Aaron Lu
2020-02-25 10:40                     ` Aubrey Li
2020-02-25 11:21                       ` Aaron Lu
2020-02-25 13:41                         ` Aubrey Li
     [not found]                 ` <CANaguZD205ccu1V_2W-QuMRrJA9SjJ5ng1do4NCdLy8NDKKrbA@mail.gmail.com>
2020-02-26  3:13                   ` Aaron Lu
2020-02-26  7:21                   ` Aubrey Li
     [not found]                     ` <CANaguZDQZg-Z6aNpeLcjQ-cGm3X8CQOkZ_hnJNUyqDRM=yVDFQ@mail.gmail.com>
2020-02-27  4:45                       ` Aubrey Li
2020-02-28 23:55                       ` Tim Chen
2020-03-03 14:59                         ` Li, Aubrey
2020-03-03 23:54                           ` Li, Aubrey
2020-03-05  4:33                             ` Aaron Lu
2020-03-05  6:10                               ` Li, Aubrey
2020-03-05  8:52                                 ` Aaron Lu
2020-02-27  2:04                   ` Aaron Lu
2020-02-27 14:10                     ` Phil Auld
2020-02-27 14:37                       ` Aubrey Li
2020-02-28  2:54                       ` Aaron Lu
2020-03-05 13:45                         ` Aubrey Li
2020-03-06  2:41                           ` Aaron Lu
2020-03-06 18:06                             ` Tim Chen
2020-03-06 18:33                               ` Phil Auld
2020-03-06 21:44                                 ` Tim Chen
2020-03-07  3:13                                   ` Aaron Lu

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