From: Tejun Heo <tj@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Turner <pjt@google.com>, Ingo Molnar <mingo@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
lizefan@huawei.com, cgroups <cgroups@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
kernel-team <kernel-team@fb.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy
Date: Thu, 17 Sep 2015 10:53:09 -0400 [thread overview]
Message-ID: <20150917145309.GA7205@mtj.duckdns.org> (raw)
In-Reply-To: <20150917143527.GJ3604@twins.programming.kicks-ass.net>
Hello,
On Thu, Sep 17, 2015 at 04:35:27PM +0200, Peter Zijlstra wrote:
> On Sat, Sep 12, 2015 at 10:40:07AM -0400, Tejun Heo wrote:
> > So, one of the problems is that the kernel can't have tasks w/o
> > runnable CPUs, so we have to some workaround when, for whatever
> > reason, a task ends up with no CPU that it can run on.
>
> No, just refuse that configuration.
Well, you've been saying that but that's not our behavior on cpu
hotunplug either and it applies the same. If we reject cpu hotunplugs
while tasks are affined to it, we can do the same in cpuset too.
> > The kernel does not update all CPU affinity masks when a CPU goes down
> > or comes up.
>
> I'd be happy to fail a CPU down for user tasks where this is the last
> runnable CPU of.
So, yeah, we need to keep these things consistent across global and
cgroup cases.
Thanks.
--
tejun
next prev parent reply other threads:[~2015-09-17 14:53 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-03 22:41 [PATCHSET sched,cgroup] sched: Implement interface for cgroup unified hierarchy Tejun Heo
2015-08-03 22:41 ` [PATCH 1/3] cgroup: define controller file conventions Tejun Heo
2015-08-04 8:42 ` Peter Zijlstra
2015-08-04 14:51 ` Tejun Heo
2015-08-04 8:48 ` Peter Zijlstra
2015-08-04 14:53 ` Tejun Heo
2015-08-04 19:31 ` [PATCH v2 " Tejun Heo
2015-08-05 0:39 ` Kamezawa Hiroyuki
2015-08-05 7:47 ` Michal Hocko
2015-08-06 2:30 ` Kamezawa Hiroyuki
2015-08-07 18:17 ` Michal Hocko
2015-08-17 22:04 ` Johannes Weiner
2015-08-17 21:34 ` Johannes Weiner
2015-08-03 22:41 ` [PATCH 2/3] sched: Misc preps for cgroup unified hierarchy interface Tejun Heo
2015-08-03 22:41 ` [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Tejun Heo
2015-08-04 9:07 ` Peter Zijlstra
2015-08-04 15:10 ` Tejun Heo
2015-08-05 9:10 ` Peter Zijlstra
2015-08-05 14:31 ` Tejun Heo
2015-08-17 20:35 ` Tejun Heo
[not found] ` <CAPM31RJTf0v=2v90kN6-HM9xUGab_k++upO0Ym=irmfO9+BbFw@mail.gmail.com>
2015-08-18 4:03 ` Paul Turner
2015-08-18 20:31 ` Tejun Heo
2015-08-18 23:39 ` Kamezawa Hiroyuki
2015-08-19 16:23 ` Tejun Heo
2015-08-19 3:23 ` Mike Galbraith
2015-08-19 16:41 ` Tejun Heo
2015-08-20 4:00 ` Mike Galbraith
2015-08-20 7:52 ` Tejun Heo
2015-08-20 8:47 ` Mike Galbraith
2015-08-21 19:26 ` Paul Turner
2015-08-22 18:29 ` Tejun Heo
2015-08-24 15:47 ` Austin S Hemmelgarn
2015-08-24 17:04 ` Tejun Heo
2015-08-24 19:18 ` Mike Galbraith
2015-08-24 20:00 ` Austin S Hemmelgarn
2015-08-24 20:25 ` Tejun Heo
2015-08-24 21:00 ` Paul Turner
2015-08-24 21:12 ` Tejun Heo
2015-08-24 21:15 ` Paul Turner
2015-08-24 20:54 ` Paul Turner
2015-08-24 21:02 ` Tejun Heo
2015-08-24 21:10 ` Paul Turner
2015-08-24 21:17 ` Tejun Heo
2015-08-24 21:19 ` Paul Turner
2015-08-24 21:40 ` Tejun Heo
2015-08-24 22:03 ` Paul Turner
2015-08-24 22:49 ` Tejun Heo
2015-08-24 23:15 ` Paul Turner
2015-08-25 2:36 ` Kamezawa Hiroyuki
2015-08-25 21:13 ` Tejun Heo
2015-08-25 9:24 ` Ingo Molnar
2015-08-25 10:00 ` Peter Zijlstra
2015-08-25 19:18 ` Tejun Heo
2015-08-24 20:52 ` Paul Turner
2015-08-24 21:36 ` Tejun Heo
2015-08-24 21:58 ` Paul Turner
2015-08-24 22:19 ` Tejun Heo
2015-08-24 23:06 ` Paul Turner
2015-08-25 21:02 ` Tejun Heo
2015-09-02 17:03 ` Tejun Heo
2015-09-09 12:49 ` Paul Turner
2015-09-12 14:40 ` Tejun Heo
2015-09-17 14:35 ` Peter Zijlstra
2015-09-17 14:53 ` Tejun Heo [this message]
2015-09-17 15:42 ` Peter Zijlstra
2015-09-17 15:10 ` Peter Zijlstra
2015-09-17 15:52 ` Tejun Heo
2015-09-17 15:53 ` Peter Zijlstra
2015-09-17 23:29 ` Tejun Heo
2015-09-18 11:27 ` Paul Turner
2015-10-01 18:46 ` Tejun Heo
2015-10-15 11:42 ` Paul Turner
2015-10-23 22:21 ` Tejun Heo
2015-10-24 4:36 ` Mike Galbraith
2015-10-25 2:18 ` Tejun Heo
2015-10-25 3:43 ` Mike Galbraith
2015-10-27 3:16 ` Tejun Heo
2015-10-27 5:42 ` Mike Galbraith
2015-10-27 5:46 ` Tejun Heo
2015-10-27 5:56 ` Mike Galbraith
2015-10-27 6:00 ` Tejun Heo
2015-10-27 6:08 ` Mike Galbraith
2015-10-25 3:54 ` Linus Torvalds
2015-10-25 9:33 ` Ingo Molnar
2015-10-25 10:41 ` Theodore Ts'o
2015-10-25 10:47 ` Florian Weimer
2015-10-25 11:58 ` Theodore Ts'o
2015-10-25 13:17 ` Florian Weimer
2015-10-25 13:40 ` Getrandom wrapper Theodore Ts'o
2015-10-26 13:32 ` Florian Weimer
2015-10-26 14:10 ` [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Peter Zijlstra
2015-08-04 19:32 ` [PATCH v2 " Tejun Heo
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=20150917145309.GA7205@mtj.duckdns.org \
--to=tj@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=cgroups@vger.kernel.org \
--cc=hannes@cmpxchg.org \
--cc=kernel-team@fb.com \
--cc=linux-kernel@vger.kernel.org \
--cc=lizefan@huawei.com \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=pjt@google.com \
--cc=torvalds@linux-foundation.org \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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).