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Groups > linux.kernel > #1443630

Re: Severe performance regression w/ 4.4+ on Android due to cgroup locking changes

From Oleg Nesterov <oleg@redhat.com>
Newsgroups linux.kernel
Subject Re: Severe performance regression w/ 4.4+ on Android due to cgroup locking changes
Date 2016-07-14 19:40 +0200
Message-ID <rUSMa-4cH-23@gated-at.bofh.it> (permalink)
References (5 earlier) <rUNCO-16b-13@gated-at.bofh.it> <rUNCP-16b-53@gated-at.bofh.it> <rUNWa-1dc-9@gated-at.bofh.it> <rUQr0-2Rf-15@gated-at.bofh.it> <rURQ5-3AM-17@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On 07/14, Peter Zijlstra wrote:
>
> But I really think that this Android usecase invalidates the premise of
> cgroups using a global lock.

Perhaps... but it would be nice to have a global lock for cgroups (and in
fact probably unify it with dup_mmap_sem). And we can't simply revert that
change now.

I am wondering if this use-case is really Android-specific or not. Because,
once again, we can add a boot option or even run-time knob for
cgroup_threadgroup_rwsem. If it is really Android-specific, we do not want
to penalize fork/exit by default.

Oleg.

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Thread

Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes John Stultz <john.stultz@linaro.org> - 2016-07-13 02:10 +0200
  Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-13 10:30 +0200
    Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-13 16:50 +0200
      Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-13 20:40 +0200
  Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-13 20:30 +0200
    Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-13 20:40 +0200
      Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-13 22:20 +0200
        Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-13 22:30 +0200
          Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-13 22:50 +0200
            Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-13 23:00 +0200
              Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-13 23:10 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-13 23:20 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-13 23:50 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes John Stultz <john.stultz@linaro.org> - 2016-07-13 23:50 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-14 00:20 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes John Stultz <john.stultz@linaro.org> - 2016-07-14 00:40 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-14 01:10 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-14 01:10 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-14 13:40 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-14 14:10 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-14 14:10 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-14 14:30 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-14 17:10 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-14 17:30 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-14 18:40 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Oleg Nesterov <oleg@redhat.com> - 2016-07-14 19:40 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes John Stultz <john.stultz@linaro.org> - 2016-07-14 19:00 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes John Stultz <john.stultz@linaro.org> - 2016-07-14 00:30 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-14 00:10 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-14 00:40 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-14 09:00 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-14 13:30 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-14 14:20 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-14 17:20 +0200
              Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-13 23:10 +0200
              Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-13 23:10 +0200
              Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-14 15:20 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-14 16:20 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Oleg Nesterov <oleg@redhat.com> - 2016-07-14 17:00 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-14 18:20 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-14 18:40 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Oleg Nesterov <oleg@redhat.com> - 2016-07-14 19:10 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-14 18:30 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-14 18:50 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-14 19:20 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes John Stultz <john.stultz@linaro.org> - 2016-07-14 18:50 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-14 18:50 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes John Stultz <john.stultz@linaro.org> - 2016-07-14 19:10 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Oleg Nesterov <oleg@redhat.com> - 2016-07-14 19:20 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes John Stultz <john.stultz@linaro.org> - 2016-07-14 19:40 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Oleg Nesterov <oleg@redhat.com> - 2016-07-14 19:50 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes John Stultz <john.stultz@linaro.org> - 2016-07-14 20:00 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Oleg Nesterov <oleg@redhat.com> - 2016-07-14 20:10 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-14 20:40 +0200
                Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-14 21:40 +0200
            Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes John Stultz <john.stultz@linaro.org> - 2016-07-13 23:00 +0200
          Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Peter Zijlstra <peterz@infradead.org> - 2016-07-13 23:00 +0200
            Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-13 23:10 +0200
          Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-13 23:00 +0200
            Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Dmitry Shmidt <dimitrysh@google.com> - 2016-07-13 23:10 +0200
              Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-07-13 23:10 +0200
              Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes John Stultz <john.stultz@linaro.org> - 2016-07-13 23:10 +0200
      Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes John Stultz <john.stultz@linaro.org> - 2016-07-13 22:20 +0200
      Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Dmitry Shmidt <dimitrysh@google.com> - 2016-07-13 22:40 +0200
    Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Colin Cross <ccross@google.com> - 2016-07-13 22:50 +0200
      Re: Severe performance regression w/ 4.4+ on Android due to cgroup  locking changes Tejun Heo <tj@kernel.org> - 2016-07-13 23:00 +0200

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