From: Peter Zijlstra <peterz@infradead.org>
To: Florian Weimer <fweimer@redhat.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>, Ingo Molnar <mingo@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Tejun Heo <tj@kernel.org>,
Mike Galbraith <umgwanakikbuti@gmail.com>,
Paul Turner <pjt@google.com>, Ingo Molnar <mingo@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Li Zefan <lizefan@huawei.com>, cgroups <cgroups@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
kernel-team <kernel-team@fb.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy
Date: Mon, 26 Oct 2015 15:10:27 +0100 [thread overview]
Message-ID: <20151026141027.GW2508@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <562CD663.5010506@redhat.com>
On Sun, Oct 25, 2015 at 02:17:23PM +0100, Florian Weimer wrote:
> On 10/25/2015 12:58 PM, Theodore Ts'o wrote:
>
> > Well, I was thinking we could just teach them to use
> > "syscall(SYS_gettid)".
>
> Right, and that's easier if TIDs are officially part of the GNU API.
>
> I think the worry is that some future system might have TIDs which do
> not share the PID space, or are real descriptors (that they need
> explicit open and close operations).
For the scheduler the sharing of pid/tid space is not an issue.
Semantically all [1] scheduler syscalls take a tid. There isn't a single
syscall that iterates the thread group.
Even sys_setpriority() interprets its @who argument as a tid when
@which == PRIO_PROCESS (PRIO_PGRP looks to be the actual process).
[1] as seen from: git grep SYSCALL kernel/sched/
next prev parent reply other threads:[~2015-10-26 14:10 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
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 ` Peter Zijlstra [this message]
2015-08-04 19:32 ` [PATCH v2 3/3] sched: Implement interface for cgroup unified hierarchy Tejun Heo
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