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Date: Fri, 11 Apr 2014 05:52:36 +0200 From: Mike Galbraith <umgwanakikbuti@...il.com> To: Steven Rostedt <rostedt@...dmis.org> Cc: LKML <linux-kernel@...r.kernel.org>, linux-rt-users <linux-rt-users@...r.kernel.org>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Paul Gortmaker <paul.gortmaker@...driver.com>, Thomas Gleixner <tglx@...utronix.de>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Clark Williams <williams@...hat.com>, Frederic Weisbecker <fweisbec@...il.com>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org> Subject: Re: [RFC PATCH RT] rwsem: The return of multi-reader PI rwsems On Thu, 2014-04-10 at 23:25 -0400, Steven Rostedt wrote: > On Fri, 11 Apr 2014 04:50:26 +0200 > Mike Galbraith <umgwanakikbuti@...il.com> wrote: > > > Oh, there was another useful bit. > > > > 3.12.17-rt25 403991 384216 377786 > > 405466 394011 392850 > > > > 3.12.17-nopreempt 109049 186133 118766 !?!.. ew, TTWU_QUEUE > > 350385 318786 367336 !TTWU_QUEUE > > 326009 356939 378215 !TTWU_QUEUE > > > > IPI == low-pass filter. > > I'm sorry, but I don't have the foggiest clue to what the above means. It means.. # Overhead Symbol # ........ ....................................................................................................................................................................................... # 17.33% [k] native_write_msr_safe | |--88.45%-- __x2apic_send_IPI_mask | | | |--97.89%-- try_to_wake_up | | | | | |--99.91%-- wake_futex | | | | | | | |--99.77%-- futex_wake_op | | | | do_futex | | | | sys_futex | | | | system_call_fastpath ..wakeup frequency is restricted by the IPI. -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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