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

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Hello, Mike.

On Wed, Aug 19, 2015 at 05:23:40AM +0200, Mike Galbraith wrote:
> Hm.  I know of a big data outfit to which attach/detach performance was
> important enough for them to have plucked an old experimental overhead
> reduction hack (mine) off lkml, and shipped it.  It must have mattered a
> LOT for them (not suicidal crash test dummies) to have done that.

There haven't been any guidelines on cgroup usage.  Of course people
have been developing in all directions.  It's a natural learning
process and there are use cases which can be served by migrating
processes back and forth.  Nobody is trying to prevent that; however,
if one examines how resources and their associations need to be
tracked for accounting and control, it's evident that there are
inherent trade-offs between migration and the stuff which happens
while not migrating and it's clear which side is more important.

Most problems can be solved in different ways and I'm doubtful that
e.g. bouncing jobs to worker threads would be more expensive than
migrating the worker back and forth in a lot of cases.  If migrating
threads around floats somebody's boat, that's fine but that has never
been and can't be the focus of design and optimization, not at the
cost of the actual hot paths.

Thanks.

-- 
tejun
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Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-04 17:20 +0200
  Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Peter Zijlstra <peterz@infradead.org> - 2015-08-05 11:20 +0200
    Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-05 16:40 +0200
      Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-17 22:40 +0200
      Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-18 06:10 +0200
        Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-18 22:40 +0200
          Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> - 2015-08-19 01:50 +0200
            Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-19 18:30 +0200
          Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-08-19 05:30 +0200
            Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-19 18:50 +0200
              Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-08-20 06:10 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-20 10:00 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-08-20 10:50 +0200
          Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-21 21:30 +0200
            Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-22 20:40 +0200
              Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-08-24 17:50 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 19:10 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-08-24 21:30 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-08-24 22:10 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 22:30 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-24 23:10 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 23:20 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-24 23:20 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-24 23:00 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 23:10 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 23:20 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-24 23:30 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 23:50 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-25 00:10 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-25 01:00 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-25 01:20 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> - 2015-08-25 04:40 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-25 23:20 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Ingo Molnar <mingo@kernel.org> - 2015-08-25 11:30 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Peter Zijlstra <peterz@infradead.org> - 2015-08-25 12:10 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-25 21:20 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-24 23:20 +0200
              Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-24 23:00 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-24 23:40 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-25 00:00 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-25 00:20 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy Paul Turner <pjt@google.com> - 2015-08-25 01:10 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-08-25 23:10 +0200
                Re: [PATCH 3/3] sched: Implement interface for cgroup unified  hierarchy Tejun Heo <tj@kernel.org> - 2015-09-02 19:10 +0200

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