Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy
Date	2015-10-26 15:20 +0100
Message-ID	<qnQMX-QQ-65@gated-at.bofh.it> (permalink)
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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/


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Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-10-24 00:30 +0200
  Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-24 06:40 +0200
    Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-10-25 03:20 +0100
      Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-25 04:50 +0100
        Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-10-27 04:20 +0100
          Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-27 06:50 +0100
            Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-10-27 06:50 +0100
              Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-27 07:00 +0100
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-10-27 07:10 +0100
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-10-27 07:10 +0100
      Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Linus Torvalds <torvalds@linux-foundation.org> - 2015-10-25 05:00 +0100
        Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Ingo Molnar <mingo@kernel.org> - 2015-10-25 10:40 +0100
          Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Theodore Ts'o <tytso@mit.edu> - 2015-10-25 11:50 +0100
            Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Florian Weimer <fweimer@redhat.com> - 2015-10-25 11:50 +0100
              Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Theodore Ts'o <tytso@mit.edu> - 2015-10-25 13:00 +0100
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Florian Weimer <fweimer@redhat.com> - 2015-10-25 14:20 +0100
                Getrandom wrapper Theodore Ts'o <tytso@mit.edu> - 2015-10-25 14:50 +0100
                Re: Getrandom wrapper Florian Weimer <fweimer@redhat.com> - 2015-10-26 14:40 +0100
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Peter Zijlstra <peterz@infradead.org> - 2015-10-26 15:20 +0100

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