linux-kernel - Re: sched_setscheduler() vs idle

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Message-ID: <1432925336.8727.29.camel@gmail.com>
Date:	Fri, 29 May 2015 20:48:56 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	ktkhai@...allels.com
Subject: Re: sched_setscheduler() vs idle_balance() race


P.S. intel_idle is not all that wonderful on this box.

-   78.31%  [kernel]       [k] _raw_spin_lock                                                                                                                                                                                              ▒
   - _raw_spin_lock                                                                                                                                                                                                                        ▒
      - 94.91% tick_broadcast_oneshot_control                                                                                                                                                                                              ▒
           intel_idle                                                                                                                                                                                                                      ▒
           cpuidle_enter_state                                                                                                                                                                                                             ▒
           cpuidle_enter                                                                                                                                                                                                                   ▒
         + cpu_startup_entry                                                                                                                                                                                                               ▒
      + 1.63% pull_rt_task                                                                                                                                                                                                                 ▒
      + 1.35% __sched_setscheduler                                                                                                                                                                                                         ▒
      + 1.11% push_rt_task.part.46                                                                                                                                                                                                         ▒
+    2.44%  [kernel]       [k] native_write_msr_safe



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