From: Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
To: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Paul Turner <pjt-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
cgroups <cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
kernel-team <kernel-team-b10kYP2dOMg@public.gmane.org>,
Linus Torvalds
<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Subject: Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy
Date: Thu, 17 Sep 2015 17:53:32 +0200 [thread overview]
Message-ID: <20150917155332.GP3816@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20150917155245.GF7205-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
On Thu, Sep 17, 2015 at 11:52:45AM -0400, Tejun Heo wrote:
> Hello,
>
> On Thu, Sep 17, 2015 at 05:10:49PM +0200, Peter Zijlstra wrote:
> > Subject: sched: Refuse to unplug a CPU if this will violate user task affinity
> >
> > Its bad policy to allow unplugging a CPU for which a user set explicit
> > affinity, either strictly on this CPU or in case this was the last
> > online CPU in its mask.
> >
> > Either would end up forcing the thread on a random other CPU, violating
> > the sys_sched_setaffinity() constraint.
>
> Shouldn't this at least handle suspend differently? Otherwise any
> userland task would be able to block suspend.
It does, it will allow suspend.
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Tejun Heo <tj@kernel.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 17:53:32 +0200 [thread overview]
Message-ID: <20150917155332.GP3816@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20150917155245.GF7205@mtj.duckdns.org>
On Thu, Sep 17, 2015 at 11:52:45AM -0400, Tejun Heo wrote:
> Hello,
>
> On Thu, Sep 17, 2015 at 05:10:49PM +0200, Peter Zijlstra wrote:
> > Subject: sched: Refuse to unplug a CPU if this will violate user task affinity
> >
> > Its bad policy to allow unplugging a CPU for which a user set explicit
> > affinity, either strictly on this CPU or in case this was the last
> > online CPU in its mask.
> >
> > Either would end up forcing the thread on a random other CPU, violating
> > the sys_sched_setaffinity() constraint.
>
> Shouldn't this at least handle suspend differently? Otherwise any
> userland task would be able to block suspend.
It does, it will allow suspend.
next prev parent reply other threads:[~2015-09-17 15:53 UTC|newest]
Thread overview: 150+ 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 ` Tejun Heo
2015-08-03 22:41 ` [PATCH 1/3] cgroup: define controller file conventions Tejun Heo
2015-08-04 8:48 ` Peter Zijlstra
2015-08-04 14:53 ` Tejun Heo
[not found] ` <1438641689-14655-2-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2015-08-04 8:42 ` Peter Zijlstra
2015-08-04 8:42 ` Peter Zijlstra
[not found] ` <20150804084257.GJ25159-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2015-08-04 14:51 ` Tejun Heo
2015-08-04 14:51 ` Tejun Heo
2015-08-04 19:31 ` [PATCH v2 " Tejun Heo
2015-08-04 19:31 ` Tejun Heo
[not found] ` <20150804193101.GI17598-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-08-05 0:39 ` Kamezawa Hiroyuki
2015-08-05 0:39 ` Kamezawa Hiroyuki
2015-08-05 7:47 ` Michal Hocko
2015-08-06 2:30 ` Kamezawa Hiroyuki
[not found] ` <55C2C6B0.3080203-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
2015-08-07 18:17 ` Michal Hocko
2015-08-07 18:17 ` Michal Hocko
2015-08-17 22:04 ` Johannes Weiner
2015-08-17 21:34 ` 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
[not found] ` <20150804151017.GD17598-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-08-05 9:10 ` Peter Zijlstra
2015-08-05 9:10 ` Peter Zijlstra
[not found] ` <20150805091036.GT25159-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2015-08-05 14:31 ` Tejun Heo
2015-08-05 14:31 ` Tejun Heo
[not found] ` <20150805143132.GK17598-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-08-17 20:35 ` 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 20:31 ` Tejun Heo
2015-08-18 23:39 ` Kamezawa Hiroyuki
2015-08-19 16:23 ` Tejun Heo
[not found] ` <20150818203117.GC15739-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-08-19 3:23 ` Mike Galbraith
2015-08-19 3:23 ` Mike Galbraith
[not found] ` <1439954620.3479.30.camel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-08-19 16:41 ` Tejun Heo
2015-08-19 16:41 ` Tejun Heo
2015-08-20 4:00 ` Mike Galbraith
[not found] ` <1440043259.3515.84.camel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-08-20 7:52 ` Tejun Heo
2015-08-20 7:52 ` Tejun Heo
[not found] ` <20150820075232.GA27917-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-08-20 8:47 ` Mike Galbraith
2015-08-20 8:47 ` Mike Galbraith
2015-08-21 19:26 ` Paul Turner
2015-08-21 19:26 ` Paul Turner
2015-08-22 18:29 ` Tejun Heo
[not found] ` <20150822182916.GE20768-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-08-24 15:47 ` Austin S Hemmelgarn
2015-08-24 15:47 ` Austin S Hemmelgarn
2015-08-24 17:04 ` Tejun Heo
[not found] ` <20150824170427.GA27262-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-08-24 19:18 ` Mike Galbraith
2015-08-24 19:18 ` Mike Galbraith
2015-08-24 20:00 ` Austin S Hemmelgarn
2015-08-24 20:00 ` Austin S Hemmelgarn
[not found] ` <55DB77F1.5080802-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-08-24 20:25 ` Tejun Heo
2015-08-24 20:25 ` Tejun Heo
2015-08-24 21:00 ` Paul Turner
[not found] ` <CAPM31R+ckFO5vNG4L5+h-yokFaZQz6kHe5a+pkRCfbL0H+NjXg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-24 21:12 ` Tejun Heo
2015-08-24 21:12 ` Tejun Heo
[not found] ` <20150824211238.GI28944-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-08-24 21:15 ` Paul Turner
2015-08-24 21:15 ` Paul Turner
2015-08-24 20:54 ` Paul Turner
2015-08-24 20:54 ` Paul Turner
[not found] ` <CAPM31RJi07qs42YsH=4JQSbZ+J-zCLv8e7yELb3tF_qAZmLqRA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-24 21:02 ` Tejun Heo
2015-08-24 21:02 ` Tejun Heo
2015-08-24 21:10 ` Paul Turner
[not found] ` <CAPM31R+i7BD8x9h_6wZVTa0zCB7XP0SGL5dSA-n6h9PTeAEhug-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-24 21:17 ` Tejun Heo
2015-08-24 21:17 ` Tejun Heo
[not found] ` <20150824211707.GJ28944-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-08-24 21:19 ` Paul Turner
2015-08-24 21:19 ` Paul Turner
[not found] ` <CAPM31R+vt1oAPCB-q6570RqZtJVBu5MH=gcQD2m9mjauStV7MA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-24 21:40 ` Tejun Heo
2015-08-24 21:40 ` Tejun Heo
2015-08-24 22:03 ` Paul Turner
[not found] ` <CAPM31R+Mnk=AL6h05eMMQvPEEfnjkB3iGb+oZj28jAQ9-ajOxA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-24 22:49 ` Tejun Heo
2015-08-24 22:49 ` Tejun Heo
[not found] ` <20150824224936.GO28944-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-08-24 23:15 ` Paul Turner
2015-08-24 23:15 ` Paul Turner
2015-08-25 2:36 ` Kamezawa Hiroyuki
2015-08-25 2:36 ` Kamezawa Hiroyuki
[not found] ` <55DBD4A9.7080603-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
2015-08-25 21:13 ` Tejun Heo
2015-08-25 21:13 ` Tejun Heo
2015-08-25 9:24 ` Ingo Molnar
[not found] ` <20150825092441.GA24131-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-08-25 10:00 ` Peter Zijlstra
2015-08-25 10:00 ` Peter Zijlstra
2015-08-25 19:18 ` Tejun Heo
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
[not found] ` <CAPM31RKCO-yxtVf+iUs8FOqk6uGSyixEXtx9zSzxQ1uOGtkDqQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-24 22:19 ` Tejun Heo
2015-08-24 22:19 ` Tejun Heo
[not found] ` <20150824221935.GN28944-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-08-24 23:06 ` Paul Turner
2015-08-24 23:06 ` Paul Turner
[not found] ` <CAPM31RK08pC3g9qx+TEw6PQvtHk8idKE3OALQN8cFr_QOuT3FA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-25 21:02 ` Tejun Heo
2015-08-25 21:02 ` Tejun Heo
[not found] ` <20150825210234.GE26785-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-09-02 17:03 ` Tejun Heo
2015-09-02 17:03 ` Tejun Heo
2015-09-09 12:49 ` Paul Turner
2015-09-09 12:49 ` Paul Turner
[not found] ` <CAPM31RJvrPL7S37=yhxMA5OGUFNUfPurTZ21nfH6eFRb15ZGtw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-09-12 14:40 ` Tejun Heo
2015-09-12 14:40 ` Tejun Heo
[not found] ` <20150912144007.GA8942-piEFEHQLUPpN0TnZuCh8vA@public.gmane.org>
2015-09-17 14:35 ` Peter Zijlstra
2015-09-17 14:35 ` Peter Zijlstra
[not found] ` <20150917143527.GJ3604-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2015-09-17 14:53 ` Tejun Heo
2015-09-17 14:53 ` Tejun Heo
2015-09-17 15:42 ` Peter Zijlstra
2015-09-17 15:10 ` Peter Zijlstra
2015-09-17 15:10 ` Peter Zijlstra
[not found] ` <20150917151049.GB11639-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2015-09-17 15:52 ` Tejun Heo
2015-09-17 15:52 ` Tejun Heo
[not found] ` <20150917155245.GF7205-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-09-17 15:53 ` Peter Zijlstra [this message]
2015-09-17 15:53 ` Peter Zijlstra
2015-09-17 23:29 ` Tejun Heo
2015-09-17 23:29 ` Tejun Heo
2015-09-18 11:27 ` Paul Turner
2015-09-18 11:27 ` Paul Turner
[not found] ` <CAPM31RLAtuaDbE9+nvMvgMB8zaOpxVcriCyE9qqszNM3XXTo5Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-01 18:46 ` Tejun Heo
2015-10-01 18:46 ` Tejun Heo
2015-10-15 11:42 ` Paul Turner
[not found] ` <CAPM31RKx0vT-9VFN=XASYM4iv4U5ZGZW93XRtJd_7mOHwu76NA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-23 22:21 ` Tejun Heo
2015-10-23 22:21 ` Tejun Heo
2015-10-24 4:36 ` Mike Galbraith
2015-10-25 2:18 ` Tejun Heo
[not found] ` <20151025021829.GA15471-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-10-25 3:43 ` Mike Galbraith
2015-10-25 3:43 ` Mike Galbraith
[not found] ` <1445744613.3180.60.camel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-10-27 3:16 ` Tejun Heo
2015-10-27 3:16 ` Tejun Heo
[not found] ` <20151027031656.GA11962-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-10-27 5:42 ` Mike Galbraith
2015-10-27 5:42 ` Mike Galbraith
[not found] ` <1445924531.2909.79.camel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-10-27 5:46 ` Tejun Heo
2015-10-27 5:46 ` Tejun Heo
2015-10-27 5:56 ` Mike Galbraith
[not found] ` <1445925402.2909.86.camel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-10-27 6:00 ` Tejun Heo
2015-10-27 6:00 ` Tejun Heo
[not found] ` <20151027060027.GA2888-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-10-27 6:08 ` Mike Galbraith
2015-10-27 6:08 ` Mike Galbraith
2015-10-25 3:54 ` Linus Torvalds
[not found] ` <CA+55aFzMdG5VPA0ZvoFANj-H-7LHeu=JUvvqPykF_w5Nd0pnSA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-10-25 9:33 ` Ingo Molnar
2015-10-25 9:33 ` Ingo Molnar
[not found] ` <20151025093331.GA4834-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-10-25 10:41 ` Theodore Ts'o
2015-10-25 10:41 ` Theodore Ts'o
2015-10-25 10:47 ` Florian Weimer
[not found] ` <562CB328.3090906-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-10-25 11:58 ` Theodore Ts'o
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
[not found] ` <1438641689-14655-4-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2015-08-04 19:32 ` [PATCH v2 " Tejun Heo
2015-08-04 19:32 ` 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=20150917155332.GP3816@twins.programming.kicks-ass.net \
--to=peterz-wegcikhe2lqwvfeawa7xhq@public.gmane.org \
--cc=akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org \
--cc=cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org \
--cc=kernel-team-b10kYP2dOMg@public.gmane.org \
--cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org \
--cc=mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
--cc=pjt-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org \
--cc=tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org \
--cc=torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.