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From: "Paul E. McKenney" <paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
To: Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
Cc: Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
	Chris Metcalf <cmetcalf-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>,
	Gilad Ben Yossef <giladb-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>,
	Steven Rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>,
	Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
	Andrew Morton
	<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	Rik van Riel <riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Frederic Weisbecker
	<fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
	Viresh Kumar
	<viresh.kumar-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	"linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH v4 1/5] nohz_full: add support for "cpu_isolated" mode
Date: Wed, 22 Jul 2015 12:28:34 -0700	[thread overview]
Message-ID: <20150722192834.GA32511@linux.vnet.ibm.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1507220856030.17411-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>

On Wed, Jul 22, 2015 at 08:57:45AM -0500, Christoph Lameter wrote:
> On Tue, 21 Jul 2015, Paul E. McKenney wrote:
> 
> > > > In the current version, there's also the vmstat_update() that
> > > > may schedule delayed work and interrupt the core again
> > > > shortly before realizing that there are no more counter updates
> > > > happening, at which point it quiesces.  Currently we handle
> > > > this in cpu_isolated mode simply by spinning and waiting for
> > > > the timer interrupts to complete.
> > >
> > > Perhaps we should fix that?
> >
> > Didn't Christoph Lameter fix this?  Or is this an additional problem?
> 
> Well the vmstat update must realize first that there are no outstanding
> updates before switching itself off. So typically there is one extra tick.
> But we could add another function that will simply fold the differential
> immediately and turn the kworker task in the expectation that the
> processor will stay quiet.

Got it, thank you!

								Thanx, Paul

  parent reply	other threads:[~2015-07-22 19:28 UTC|newest]

Thread overview: 159+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-08 17:58 [PATCH 0/6] support "dataplane" mode for nohz_full Chris Metcalf
2015-05-08 17:58 ` [PATCH 1/6] nohz_full: add support for "dataplane" mode Chris Metcalf
2015-05-08 17:58 ` [PATCH 4/6] nohz: support PR_DATAPLANE_QUIESCE Chris Metcalf
     [not found]   ` <1431107927-13998-5-git-send-email-cmetcalf-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-05-12  9:33     ` Peter Zijlstra
     [not found]       ` <20150512093349.GH21418-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2015-05-12  9:50         ` Ingo Molnar
     [not found]           ` <20150512095030.GD11477-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-05-12 10:38             ` Peter Zijlstra
2015-05-12 12:52               ` Ingo Molnar
2015-05-13  4:35                 ` Andy Lutomirski
2015-05-13 17:51                   ` Paul E. McKenney
     [not found]                     ` <20150513175150.GL6776-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2015-05-14 20:55                       ` Chris Metcalf
2015-05-14 20:54       ` Chris Metcalf
2015-05-08 17:58 ` [PATCH 5/6] nohz: support PR_DATAPLANE_STRICT mode Chris Metcalf
2015-05-09  7:28   ` Andy Lutomirski
2015-05-09 10:37     ` Gilad Ben Yossef
     [not found]     ` <CALCETrUoptUPVUxL87jUgry1pFac0rDPpnZ790zDKyK4a0FARA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-11 19:13       ` Chris Metcalf
2015-05-11 22:28         ` Andy Lutomirski
2015-05-12 21:06           ` Chris Metcalf
2015-05-12 22:23             ` Andy Lutomirski
2015-05-15 21:25               ` Chris Metcalf
2015-05-12  9:38   ` Peter Zijlstra
     [not found]     ` <20150512093858.GI21418-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2015-05-12 13:20       ` Paul E. McKenney
     [not found] ` <1431107927-13998-1-git-send-email-cmetcalf-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-05-08 21:18   ` [PATCH 0/6] support "dataplane" mode for nohz_full Andrew Morton
2015-05-08 21:22     ` Steven Rostedt
     [not found]       ` <20150508172210.559830a9-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2015-05-08 23:11         ` Chris Metcalf
2015-05-08 23:19           ` Andrew Morton
2015-05-09  7:05             ` Ingo Molnar
     [not found]               ` <20150509070538.GA9413-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-05-09  7:19                 ` Andy Lutomirski
     [not found]                   ` <CALCETrXavog018+xLacXeBLaMLjWtqk0bMU5fUzZ+pkwgu7Y3A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-05-11 19:54                     ` Chris Metcalf
     [not found]                       ` <555108FC.3060200-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-05-11 22:15                         ` Andy Lutomirski
     [not found]                   ` <55510885.9070101@ezchip.com>
2015-05-12 13:18                     ` Paul E. McKenney
2015-05-09  7:19                 ` Mike Galbraith
     [not found]                   ` <1431155983.3209.131.camel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-05-09 10:18                     ` Gilad Ben Yossef
2015-05-11 12:57                 ` Steven Rostedt
2015-05-11 15:36                   ` Frederic Weisbecker
2015-05-11 19:19                     ` Mike Galbraith
2015-05-11 19:25                       ` Chris Metcalf
2015-05-12  1:47                         ` Mike Galbraith
2015-05-12  4:35                           ` Mike Galbraith
2015-05-11 17:19                   ` Paul E. McKenney
2015-05-11 17:27                     ` Andrew Morton
2015-05-11 17:33                       ` Frederic Weisbecker
2015-05-11 18:00                         ` Steven Rostedt
2015-05-11 18:09                           ` Chris Metcalf
     [not found]                             ` <5550F077.6030906-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-05-11 18:36                               ` Steven Rostedt
2015-05-12  9:10                             ` CONFIG_ISOLATION=y (was: [PATCH 0/6] support "dataplane" mode for nohz_full) Ingo Molnar
     [not found]                               ` <20150512091032.GA10138-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-05-12 11:48                                 ` Peter Zijlstra
2015-05-12 12:34                                   ` Ingo Molnar
     [not found]                                     ` <20150512123440.GA16959-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-05-12 12:39                                       ` Peter Zijlstra
     [not found]                                         ` <20150512123912.GO21418-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2015-05-12 12:43                                           ` Ingo Molnar
2015-05-12 15:36                                     ` Frederic Weisbecker
2015-05-12 21:05                               ` CONFIG_ISOLATION=y Chris Metcalf
     [not found]                   ` <20150511085759.71deeb64-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2015-05-12 10:46                     ` [PATCH 0/6] support "dataplane" mode for nohz_full Peter Zijlstra
2015-05-15 15:10                       ` Chris Metcalf
2015-05-15 21:26   ` [PATCH v2 0/5] support "cpu_isolated" " Chris Metcalf
2015-05-15 21:27     ` [PATCH v2 1/5] nohz_full: add support for "cpu_isolated" mode Chris Metcalf
2015-05-15 21:27       ` [PATCH v2 2/5] nohz: support PR_CPU_ISOLATED_STRICT mode Chris Metcalf
     [not found]       ` <1431725251-20943-1-git-send-email-cmetcalf-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-05-15 21:27         ` [PATCH v2 3/5] nohz: cpu_isolated strict mode configurable signal Chris Metcalf
2015-05-15 22:17         ` [PATCH v2 1/5] nohz_full: add support for "cpu_isolated" mode Thomas Gleixner
2015-05-28 20:38           ` Chris Metcalf
     [not found]     ` <1431725178-20876-1-git-send-email-cmetcalf-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-06-03 15:29       ` [PATCH v3 0/5] support "cpu_isolated" mode for nohz_full Chris Metcalf
     [not found]         ` <1433345365-29506-1-git-send-email-cmetcalf-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-06-03 15:29           ` [PATCH v3 1/5] nohz_full: add support for "cpu_isolated" mode Chris Metcalf
2015-06-03 15:29           ` [PATCH v3 3/5] nohz: cpu_isolated strict mode configurable signal Chris Metcalf
2015-06-03 15:29         ` [PATCH v3 2/5] nohz: support PR_CPU_ISOLATED_STRICT mode Chris Metcalf
2015-07-13 19:57         ` [PATCH v4 0/5] support "cpu_isolated" mode for nohz_full Chris Metcalf
2015-07-13 19:57           ` [PATCH v4 1/5] nohz_full: add support for "cpu_isolated" mode Chris Metcalf
2015-07-13 20:40             ` Andy Lutomirski
2015-07-13 21:01               ` Chris Metcalf
2015-07-13 21:45                 ` Andy Lutomirski
2015-07-21 19:10                   ` Chris Metcalf
2015-07-21 19:26                     ` Andy Lutomirski
     [not found]                       ` <CALCETrVoHvofNHG81Q2Vb2i1qc7f2dy=qgkyb5NWNfUgYxhE8Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-21 20:36                         ` Paul E. McKenney
2015-07-22 13:57                           ` Christoph Lameter
     [not found]                             ` <alpine.DEB.2.11.1507220856030.17411-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-07-22 19:28                               ` Paul E. McKenney [this message]
2015-07-22 20:02                                 ` Christoph Lameter
2015-07-24 20:21                                   ` Chris Metcalf
2015-07-24 20:22                       ` Chris Metcalf
2015-07-24 14:03                     ` Frederic Weisbecker
2015-07-24 20:19                       ` Chris Metcalf
2015-07-24 13:27             ` Frederic Weisbecker
2015-07-24 20:21               ` Chris Metcalf
2015-07-13 19:57           ` [PATCH v4 2/5] nohz: support PR_CPU_ISOLATED_STRICT mode Chris Metcalf
     [not found]             ` <1436817481-8732-3-git-send-email-cmetcalf-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-07-13 21:47               ` Andy Lutomirski
     [not found]                 ` <CALCETrUvg+Dix=jG2_1J=mgQC+uRk4dthCYDcb4E5ooEfQjqtQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-21 19:34                   ` Chris Metcalf
     [not found]                     ` <55AE9EAC.4010202-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-07-21 19:42                       ` Andy Lutomirski
2015-07-24 20:29                         ` Chris Metcalf
2015-07-13 19:57           ` [PATCH v4 3/5] nohz: cpu_isolated strict mode configurable signal Chris Metcalf
     [not found]           ` <1436817481-8732-1-git-send-email-cmetcalf-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-07-28 19:49             ` [PATCH v5 0/6] support "cpu_isolated" mode for nohz_full Chris Metcalf
2015-07-28 19:49               ` [PATCH v5 2/6] cpu_isolated: add initial support Chris Metcalf
     [not found]                 ` <1438112980-9981-3-git-send-email-cmetcalf-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-08-12 16:00                   ` Frederic Weisbecker
2015-08-12 18:22                     ` Chris Metcalf
     [not found]                       ` <55CB8ED1.6030806-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-08-26 15:26                         ` Frederic Weisbecker
2015-08-26 15:55                           ` Chris Metcalf
2015-07-28 19:49               ` [PATCH v5 3/6] cpu_isolated: support PR_CPU_ISOLATED_STRICT mode Chris Metcalf
2015-07-28 19:49               ` [PATCH v5 4/6] cpu_isolated: provide strict mode configurable signal Chris Metcalf
2015-08-25 19:55               ` [PATCH v6 0/6] support "task_isolated" mode for nohz_full Chris Metcalf
2015-08-25 19:55                 ` [PATCH v6 2/6] task_isolation: add initial support Chris Metcalf
2015-08-25 19:55                 ` [PATCH v6 3/6] task_isolation: support PR_TASK_ISOLATION_STRICT mode Chris Metcalf
2015-08-26 10:36                   ` Will Deacon
2015-08-26 15:10                     ` Chris Metcalf
     [not found]                       ` <55DDD6EA.3070307-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-09-02 10:13                         ` Will Deacon
2015-08-28 15:31                     ` [PATCH v6.1 " Chris Metcalf
     [not found]                 ` <1440532555-15492-1-git-send-email-cmetcalf-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-08-25 19:55                   ` [PATCH v6 4/6] task_isolation: provide strict mode configurable signal Chris Metcalf
2015-08-28 19:22                     ` Andy Lutomirski
     [not found]                       ` <20150902101347.GF25720-5wv7dgnIgG8@public.gmane.org>
2015-09-02 18:38                         ` [PATCH v6.2 3/6] task_isolation: support PR_TASK_ISOLATION_STRICT mode Chris Metcalf
2015-09-28 15:17                 ` [PATCH v7 00/11] support "task_isolated" mode for nohz_full Chris Metcalf
2015-09-28 15:17                   ` [PATCH v7 02/11] task_isolation: add initial support Chris Metcalf
2015-10-01 12:14                     ` Frederic Weisbecker
2015-10-01 12:18                       ` Thomas Gleixner
2015-10-01 12:23                         ` Frederic Weisbecker
2015-10-01 12:31                           ` Thomas Gleixner
2015-10-01 17:02                         ` Chris Metcalf
     [not found]                           ` <560D6725.9000609-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-10-01 21:20                             ` Thomas Gleixner
2015-10-02 17:15                               ` Chris Metcalf
     [not found]                                 ` <560EBBC5.7000709-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-10-02 19:02                                   ` Thomas Gleixner
2015-10-01 19:25                       ` Chris Metcalf
2015-09-28 15:17                   ` [PATCH v7 03/11] task_isolation: support PR_TASK_ISOLATION_STRICT mode Chris Metcalf
     [not found]                     ` <1443453446-7827-4-git-send-email-cmetcalf-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-09-28 20:51                       ` Andy Lutomirski
2015-09-28 21:54                         ` Chris Metcalf
2015-09-28 22:38                           ` Andy Lutomirski
2015-09-29 17:35                             ` Chris Metcalf
     [not found]                               ` <560ACBD9.90909-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-09-29 17:46                                 ` Andy Lutomirski
     [not found]                                   ` <CALCETrUp+8UG5dKLdybcmhhfzcyUP8h-RJHcG0Bo7Up=Rx6DVA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-09-29 17:57                                     ` Chris Metcalf
2015-09-29 18:00                                       ` Andy Lutomirski
     [not found]                                         ` <CALCETrVrHFh_wW_u0E+3mcN9J7_M+hAF59CdKOzKt3NT+gWJgg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-01 19:25                                           ` Chris Metcalf
2015-09-28 15:17                   ` [PATCH v7 04/11] task_isolation: provide strict mode configurable signal Chris Metcalf
2015-09-28 20:54                     ` Andy Lutomirski
     [not found]                       ` <CALCETrXaWaUwWnOz16RAqjFP9tZm=tp74xWacXjqa36TWB9BfQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-09-28 21:54                         ` Chris Metcalf
2015-10-20 20:35                   ` [PATCH v8 00/14] support "task_isolation" mode for nohz_full Chris Metcalf
2015-10-20 20:36                     ` [PATCH v8 04/14] task_isolation: add initial support Chris Metcalf
2015-10-20 20:56                       ` Andy Lutomirski
     [not found]                         ` <CALCETrWzhrYreizoKG0w6Jtz3RLFjNx9Qk_JLykcLLUQcCXBEA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-20 21:20                           ` Chris Metcalf
     [not found]                             ` <5626B00E.3010309-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-10-20 21:26                               ` Andy Lutomirski
     [not found]                                 ` <CALCETrX6e+mqfy-rNV3sA8xGVDNHviQ9vHBBhAPULeLecno7XQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-21  0:29                                   ` Steven Rostedt
2015-10-26 20:19                                     ` Chris Metcalf
2015-10-26 21:13                                     ` Chris Metcalf
2015-10-26 20:32                                 ` Chris Metcalf
     [not found]                       ` <1445373372-6567-5-git-send-email-cmetcalf-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-10-21 16:12                         ` Frederic Weisbecker
2015-10-27 16:40                           ` Chris Metcalf
     [not found]                             ` <562FA8FD.8080502-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2016-01-28 16:38                               ` Frederic Weisbecker
2016-02-11 19:58                                 ` Chris Metcalf
2015-10-20 20:36                     ` [PATCH v8 05/14] task_isolation: support PR_TASK_ISOLATION_STRICT mode Chris Metcalf
2015-10-20 20:36                     ` [PATCH v8 06/14] task_isolation: provide strict mode configurable signal Chris Metcalf
2015-10-21  0:56                       ` Steven Rostedt
     [not found]                         ` <20151020205610.51b3d742-2kNGR76GQU9OHLTnHDQRgA@public.gmane.org>
2015-10-21  1:30                           ` Chris Metcalf
2015-10-21  1:41                             ` Steven Rostedt
2015-10-21  1:42                             ` Andy Lutomirski
     [not found]                               ` <CALCETrXqDi24EPn79X9SXuz+5sYGZBF3yCRzb8PwdL=YbxVujw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-21  6:41                                 ` Gilad Ben Yossef
2015-10-21 18:53                                   ` Andy Lutomirski
2015-10-22 20:44                                     ` Chris Metcalf
2015-10-22 21:00                                       ` Andy Lutomirski
     [not found]                                         ` <CALCETrVQXwYwhEwbJsvN18w8qD-qVVCQAa8b9RcXD=RmXSqLiQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-27 19:37                                           ` Chris Metcalf
     [not found]                                     ` <CALCETrVuE_VCk-7_VMJ-orL8pg+0F5vq6qvt4SfgXzt_MRr-SQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-24  9:16                                       ` Gilad Ben Yossef
2015-10-21 12:39                     ` [PATCH v8 00/14] support "task_isolation" mode for nohz_full Peter Zijlstra
2015-10-22 20:31                       ` Chris Metcalf
2015-10-23  2:33                         ` Frederic Weisbecker
2015-10-23  8:49                           ` Peter Zijlstra
2015-10-23 13:29                             ` Frederic Weisbecker
     [not found]                         ` <562947B0.7050103-d5a29ZRxExrQT0dZR+AlfA@public.gmane.org>
2015-10-23  9:04                           ` Peter Zijlstra
2015-10-23 11:52                             ` Theodore Ts'o

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