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From: Julien Desfossez <jdesfossez@digitalocean.com>
To: Aaron Lu <aaron.lu@linux.alibaba.com>
Cc: Vineeth Remanan Pillai <vpillai@digitalocean.com>,
	Phil Auld <pauld@redhat.com>,
	Nishanth Aravamudan <naravamudan@digitalocean.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Tim Chen <tim.c.chen@linux.intel.com>,
	mingo@kernel.org, tglx@linutronix.de, pjt@google.com,
	torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
	subhra.mazumdar@oracle.com, fweisbec@gmail.com,
	keescook@chromium.org, kerrnel@google.com,
	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 v2 00/17] Core scheduling v2
Date: Wed, 8 May 2019 13:49:09 -0400	[thread overview]
Message-ID: <20190508174909.GA18516@sinkpad> (raw)
In-Reply-To: <20190508023009.GA89792@aaronlu>

On 08-May-2019 10:30:09 AM, Aaron Lu wrote:
> On Mon, May 06, 2019 at 03:39:37PM -0400, Julien Desfossez wrote:
> > On 29-Apr-2019 11:53:21 AM, Aaron Lu wrote:
> > > This is what I have used to make sure no two unmatched tasks being
> > > scheduled on the same core: (on top of v1, I thinks it's easier to just
> > > show the diff instead of commenting on various places of the patches :-)
> > 
> > We imported this fix in v2 and made some small changes and optimizations
> > (with and without Peter’s fix from https://lkml.org/lkml/2019/4/26/658)
> > and in both cases, the performance problem where the core can end up
> 
> By 'core', do you mean a logical CPU(hyperthread) or the entire core?
No I really meant the entire core.

I’m sorry, I should have added a little bit more context. This relates
to a performance issue we saw in v1 and discussed here:
https://lore.kernel.org/lkml/20190410150116.GI2490@worktop.programming.kicks-ass.net/T/#mb9f1f54a99bac468fc5c55b06a9da306ff48e90b

We proposed a fix that solved this, Peter came up with a better one
(https://lkml.org/lkml/2019/4/26/658), but if we add your isolation fix
as posted above, the same problem reappears. Hope this clarifies your
ask.

I hope that we did not miss anything crucial while integrating your fix
on top of v2 + Peter’s fix. The changes are conceptually similar, but we
refactored it slightly to make the logic clear. Please have a look and
let us know

Thanks,

Julien

  reply	other threads:[~2019-05-08 17:49 UTC|newest]

Thread overview: 109+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-23 16:18 [RFC PATCH v2 00/17] Core scheduling v2 Vineeth Remanan Pillai
2019-04-23 16:18 ` [RFC PATCH v2 01/17] stop_machine: Fix stop_cpus_in_progress ordering Vineeth Remanan Pillai
2019-04-23 16:18 ` [RFC PATCH v2 02/17] sched: Fix kerneldoc comment for ia64_set_curr_task Vineeth Remanan Pillai
2019-04-23 16:18 ` [RFC PATCH v2 03/17] sched: Wrap rq::lock access Vineeth Remanan Pillai
2019-04-23 16:18 ` [RFC PATCH v2 04/17] sched/{rt,deadline}: Fix set_next_task vs pick_next_task Vineeth Remanan Pillai
2019-04-23 16:18 ` [RFC PATCH v2 05/17] sched: Add task_struct pointer to sched_class::set_curr_task Vineeth Remanan Pillai
2019-04-23 16:18 ` [RFC PATCH v2 06/17] sched/fair: Export newidle_balance() Vineeth Remanan Pillai
2019-04-23 16:18 ` [RFC PATCH v2 07/17] sched: Allow put_prev_task() to drop rq->lock Vineeth Remanan Pillai
2019-04-23 16:18 ` [RFC PATCH v2 08/17] sched: Rework pick_next_task() slow-path Vineeth Remanan Pillai
2019-04-23 16:18 ` [RFC PATCH v2 09/17] sched: Introduce sched_class::pick_task() Vineeth Remanan Pillai
2019-04-26 14:02   ` Peter Zijlstra
2019-04-26 16:10     ` Vineeth Remanan Pillai
2019-04-29  5:38   ` Aaron Lu
2019-04-23 16:18 ` [RFC PATCH v2 10/17] sched: Core-wide rq->lock Vineeth Remanan Pillai
2019-04-23 16:18 ` [RFC PATCH v2 11/17] sched: Basic tracking of matching tasks Vineeth Remanan Pillai
2019-04-24  0:08   ` Tim Chen
2019-04-24 20:43     ` Vineeth Remanan Pillai
2019-04-24 22:12       ` Tim Chen
2019-04-25 14:35       ` Phil Auld
2019-05-22 19:52         ` Vineeth Remanan Pillai
2019-04-24  0:17   ` Tim Chen
2019-04-24 20:43     ` Vineeth Remanan Pillai
2019-04-29  3:36   ` Aaron Lu
2019-05-10 13:06     ` Peter Zijlstra
2019-04-29  6:15   ` Aaron Lu
2019-05-01 23:27     ` Tim Chen
2019-05-03  0:06       ` Tim Chen
2019-05-08 15:49         ` Aubrey Li
2019-05-08 18:19           ` Subhra Mazumdar
2019-05-08 18:37             ` Subhra Mazumdar
2019-05-09  0:01               ` Aubrey Li
2019-05-09  0:25                 ` Subhra Mazumdar
2019-05-09  1:38                   ` Aubrey Li
2019-05-09  2:14                     ` Subhra Mazumdar
2019-05-09 15:10                       ` Aubrey Li
2019-05-09 17:50                         ` Subhra Mazumdar
2019-05-10  0:09                           ` Tim Chen
2019-04-23 16:18 ` [RFC PATCH v2 12/17] sched: A quick and dirty cgroup tagging interface Vineeth Remanan Pillai
2019-04-25 14:26   ` Phil Auld
2019-04-26 14:13     ` Peter Zijlstra
2019-04-26 14:19       ` Phil Auld
2019-05-10 15:12   ` Julien Desfossez
2019-04-23 16:18 ` [RFC PATCH v2 13/17] sched: Add core wide task selection and scheduling Vineeth Remanan Pillai
2019-04-29  7:13   ` Aaron Lu
2019-05-18 15:37   ` Aubrey Li
2019-05-20 13:04     ` Phil Auld
2019-05-20 14:04       ` Vineeth Pillai
2019-05-21  8:19         ` Aubrey Li
2019-05-21 13:24           ` Vineeth Pillai
2019-04-23 16:18 ` [RFC PATCH v2 14/17] sched/fair: Add a few assertions Vineeth Remanan Pillai
2019-04-23 16:18 ` [RFC PATCH v2 15/17] sched: Trivial forced-newidle balancer Vineeth Remanan Pillai
2019-04-23 23:46   ` Aubrey Li
2019-04-24 14:03     ` Vineeth Remanan Pillai
2019-04-24 14:05     ` Vineeth Remanan Pillai
2019-04-23 16:18 ` [RFC PATCH v2 16/17] sched: Wake up sibling if it has something to run Vineeth Remanan Pillai
2019-04-26 15:03   ` Peter Zijlstra
2019-04-29 12:36     ` Julien Desfossez
2019-04-23 16:18 ` [RFC PATCH v2 17/17] sched: Debug bits Vineeth Remanan Pillai
2019-05-17 17:18   ` Aubrey Li
2019-04-23 18:02 ` [RFC PATCH v2 00/17] Core scheduling v2 Phil Auld
2019-04-23 18:45   ` Vineeth Remanan Pillai
2019-04-29  3:53     ` Aaron Lu
2019-05-06 19:39       ` Julien Desfossez
2019-05-08  2:30         ` Aaron Lu
2019-05-08 17:49           ` Julien Desfossez [this message]
2019-05-09  2:11             ` Aaron Lu
2019-05-15 21:36               ` Vineeth Remanan Pillai
2019-04-23 23:25 ` Aubrey Li
2019-04-24 11:19   ` Vineeth Remanan Pillai
2019-05-15 21:39     ` Vineeth Remanan Pillai
2019-04-24 13:13 ` Aubrey Li
2019-04-24 14:00   ` Julien Desfossez
2019-04-25  3:15     ` Aubrey Li
2019-04-25  9:55       ` Ingo Molnar
2019-04-25 14:46         ` Mel Gorman
2019-04-25 18:53           ` Ingo Molnar
2019-04-25 18:59             ` Thomas Gleixner
2019-04-25 19:34               ` Ingo Molnar
2019-04-25 21:31             ` Mel Gorman
2019-04-26  8:42               ` Ingo Molnar
2019-04-26 10:43                 ` Mel Gorman
2019-04-26 18:37                   ` Subhra Mazumdar
2019-04-26 19:49                     ` Mel Gorman
2019-04-26  9:45               ` Ingo Molnar
2019-04-26 10:19                 ` Mel Gorman
2019-04-27  9:06                   ` Ingo Molnar
2019-04-26  9:51               ` Ingo Molnar
2019-04-26 14:15             ` Phil Auld
2019-04-26  2:18         ` Aubrey Li
2019-04-26  9:51           ` Ingo Molnar
2019-04-27  3:51         ` Aubrey Li
2019-04-27  9:17           ` Ingo Molnar
2019-04-27 14:04             ` Aubrey Li
2019-04-27 14:21               ` Ingo Molnar
2019-04-27 15:54                 ` Aubrey Li
2019-04-28  9:33                   ` Ingo Molnar
2019-04-28 10:29                     ` Aubrey Li
2019-04-28 12:17                       ` Ingo Molnar
2019-04-29  2:17                         ` Li, Aubrey
2019-04-29  6:14                           ` Ingo Molnar
2019-04-29 13:25                             ` Li, Aubrey
2019-04-29 15:39                               ` Phil Auld
2019-04-30  1:24                                 ` Aubrey Li
2019-04-29 16:00                               ` Ingo Molnar
2019-04-30  1:34                                 ` Aubrey Li
2019-04-30  4:42                                   ` Ingo Molnar
2019-05-18  0:58                                     ` Li, Aubrey
2019-05-18  1:08                                       ` Li, Aubrey
2019-04-25 14:36 ` Julien Desfossez

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