LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: "Rafael J. Wysocki" <rafael@kernel.org>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Thomas Ilsche <thomas.ilsche@tu-dresden.de>,
Peter Zijlstra <peterz@infradead.org>,
Linux PM <linux-pm@vger.kernel.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
Doug Smythies <dsmythies@telus.net>,
Rik van Riel <riel@surriel.com>,
Aubrey Li <aubrey.li@linux.intel.com>,
Mike Galbraith <mgalbraith@suse.de>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFT][PATCH v7 6/8] sched: idle: Select idle state before stopping the tick
Date: Wed, 28 Mar 2018 12:56:42 +0200 [thread overview]
Message-ID: <CAJZ5v0h40DDZ5da7CS4702Z=D3bY7SsOhbUqPR44qVKU0E4D4A@mail.gmail.com> (raw)
In-Reply-To: <CAJZ5v0iRjj5DEKU1m2_y96WRBNu6U1w=GSADRxWXfVDN9K+edQ@mail.gmail.com>
On Wed, Mar 28, 2018 at 12:37 PM, Rafael J. Wysocki <rafael@kernel.org> wrote:
> On Wed, Mar 28, 2018 at 10:38 AM, Thomas Ilsche
> <thomas.ilsche@tu-dresden.de> wrote:
>> On 2018-03-28 10:13, Rafael J. Wysocki wrote:
>>>
[cut]
>
> So I do
>
> $ for cpu in 0 1 2 3; do taskset -c $cpu sh -c 'while true; do usleep
> 500; done' & done
>
> which is a shell kind of imitation of the above and I cannot see this
> issue at all.
>
> I count the number of times data->next_timer_us in menu_select() is
> greater than TICK_USEC and while this "workload" is running, that
> number is exactly 0.
>
> I'll try with a C program still.
And with a C program I see data->next_timer_us greater than TICK_USEC
while it is running, so let me dig deeper.
next prev parent reply other threads:[~2018-03-28 10:56 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-20 15:12 [RFT][PATCH v7 0/8] sched/cpuidle: Idle loop rework Rafael J. Wysocki
2018-03-20 15:13 ` [RFT][PATCH v7 1/8] time: tick-sched: Reorganize idle tick management code Rafael J. Wysocki
2018-03-20 15:15 ` [RFT][PATCH v7 2/8] sched: idle: Do not stop the tick upfront in the idle loop Rafael J. Wysocki
2018-03-20 15:15 ` [RFT][PATCH v7 3/8] " Rafael J. Wysocki
2018-03-20 18:00 ` [Correction][RFT][PATCH v7 3/8] sched: idle: Do not stop the tick before cpuidle_idle_call() Rafael J. Wysocki
2018-03-20 15:16 ` [RFT][PATCH v7 4/8] jiffies: Introduce USER_TICK_USEC and redefine TICK_USEC Rafael J. Wysocki
2018-03-20 15:45 ` [RFT][PATCH v7 5/8] cpuidle: Return nohz hint from cpuidle_select() Rafael J. Wysocki
2018-03-21 6:48 ` [RFT][PATCH v7.1 " Rafael J. Wysocki
2018-03-21 11:52 ` Rafael J. Wysocki
2018-03-21 13:03 ` [RFT][PATCH v7.2 " Rafael J. Wysocki
2018-03-21 14:36 ` [RFT][PATCH v7 " Rafael J. Wysocki
2018-03-21 17:59 ` Thomas Ilsche
2018-03-21 22:15 ` Rafael J. Wysocki
2018-03-22 13:18 ` Thomas Ilsche
2018-03-22 17:23 ` Rafael J. Wysocki
2018-03-22 6:24 ` Doug Smythies
2018-03-22 15:41 ` Doug Smythies
2018-03-22 17:21 ` Rafael J. Wysocki
2018-03-21 18:23 ` Doug Smythies
2018-03-22 17:40 ` [RFT][PATCH v7.3 " Rafael J. Wysocki
2018-03-28 9:14 ` Thomas Ilsche
2018-03-30 9:39 ` Rafael J. Wysocki
2018-04-10 15:22 ` Thomas Ilsche
2018-03-22 20:46 ` Doug Smythies
2018-03-20 15:45 ` [RFT][PATCH v7 6/8] sched: idle: Select idle state before stopping the tick Rafael J. Wysocki
2018-03-27 21:50 ` Thomas Ilsche
2018-03-27 22:10 ` Rafael J. Wysocki
2018-03-28 8:13 ` Rafael J. Wysocki
2018-03-28 8:38 ` Thomas Ilsche
2018-03-28 10:37 ` Rafael J. Wysocki
2018-03-28 10:56 ` Rafael J. Wysocki [this message]
2018-03-28 15:15 ` Thomas Ilsche
2018-03-28 20:41 ` Doug Smythies
2018-03-28 23:11 ` Rafael J. Wysocki
2018-03-20 15:46 ` [RFT][PATCH v7 7/8] cpuidle: menu: Refine idle state selection for running tick Rafael J. Wysocki
2018-03-20 15:47 ` [RFT][PATCH v7 8/8] cpuidle: menu: Avoid selecting shallow states with stopped tick Rafael J. Wysocki
2018-03-20 17:52 ` [RFT][PATCH v7 3/8] sched: idle: Do not stop the tick upfront in the idle loop Doug Smythies
2018-03-20 18:01 ` Rafael J. Wysocki
2018-03-21 12:31 ` [RFT][PATCH v7 0/8] sched/cpuidle: Idle loop rework Rik van Riel
2018-03-21 13:55 ` Rafael J. Wysocki
2018-03-21 14:53 ` Rik van Riel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAJZ5v0h40DDZ5da7CS4702Z=D3bY7SsOhbUqPR44qVKU0E4D4A@mail.gmail.com' \
--to=rafael@kernel.org \
--cc=aubrey.li@linux.intel.com \
--cc=dsmythies@telus.net \
--cc=fweisbec@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=mgalbraith@suse.de \
--cc=paulmck@linux.vnet.ibm.com \
--cc=peterz@infradead.org \
--cc=riel@surriel.com \
--cc=tglx@linutronix.de \
--cc=thomas.ilsche@tu-dresden.de \
--subject='Re: [RFT][PATCH v7 6/8] sched: idle: Select idle state before stopping the tick' \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).