From: Peter Zijlstra <peterz@infradead.org>
To: Waiman Long <waiman.long@hpe.com>
Cc: Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Ding Tianhong <dingtianhong@huawei.com>,
Jason Low <jason.low2@hpe.com>,
Davidlohr Bueso <dave@stgolabs.net>,
"Paul E. McKenney" <paulmck@us.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <Will.Deacon@arm.com>,
Tim Chen <tim.c.chen@linux.intel.com>
Subject: Re: [PATCH v2 0/4] locking/mutex: Enable optimistic spinning of lock waiter
Date: Tue, 22 Mar 2016 10:59:12 +0100 [thread overview]
Message-ID: <20160322095912.GD6356@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <56F0B9A6.4040903@hpe.com>
On Mon, Mar 21, 2016 at 11:19:02PM -0400, Waiman Long wrote:
> Instead, the subject was
>
> [lkp] [locking/mutex] 5267438002: +38.9%
> fileio.time.involuntary_context_switches
>
> 4409 ± 1% +38.9% 6126 ± 2%
> fileio.time.involuntary_context_switches
> 6.00 ± 0% +33.3% 8.00 ± 0%
> fileio.time.percent_of_cpu_this_job_got
> 36.06 ± 0% +43.0% 51.55 ± 0% fileio.time.system_time
> 1828660 ± 0% -92.5% 137258 ± 0%
> fileio.time.voluntary_context_switches
>
> Given that the number of voluntary context switches dropped by 92.5%, an
> increase in involuntary context switches that is order of magnitude less
> than the voluntary context switches should be OK, I think.
>
> Do you know how to report back that this increase is expected and is nothing
> to worry about? Do I just reply it back?
Nah, just ignore.
prev parent reply other threads:[~2016-03-22 9:59 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-12 17:32 Waiman Long
2016-02-12 17:32 ` [PATCH v2 1/4] locking/mutex: Add waiter parameter to mutex_optimistic_spin() Waiman Long
2016-02-12 20:23 ` Peter Zijlstra
2016-02-12 22:14 ` Davidlohr Bueso
2016-02-13 12:10 ` Peter Zijlstra
2016-02-13 18:14 ` Davidlohr Bueso
2016-02-16 2:15 ` Jason Low
2016-02-16 2:22 ` Jason Low
2016-02-16 8:53 ` Peter Zijlstra
2016-02-17 1:40 ` Waiman Long
2016-02-15 22:06 ` Waiman Long
2016-02-12 20:40 ` Peter Zijlstra
2016-02-15 23:55 ` Waiman Long
2016-02-16 3:00 ` Jason Low
2016-02-16 3:30 ` Waiman Long
2016-02-12 22:02 ` Davidlohr Bueso
2016-02-12 22:09 ` Davidlohr Bueso
2016-02-16 0:03 ` Waiman Long
2016-02-12 17:32 ` [PATCH v2 2/4] locking/mutex: Enable optimistic spinning of woken task in wait queue Waiman Long
2016-02-12 17:32 ` [PATCH v2 3/4] locking/mutex: Avoid missed wakeup of mutex waiter Waiman Long
2016-02-12 17:32 ` [PATCH v2 4/4] sched/fair: Abort wakeup when task is no longer in a sleeping state Waiman Long
2016-02-12 20:18 ` Peter Zijlstra
2016-02-12 21:22 ` Waiman Long
2016-02-13 12:09 ` Peter Zijlstra
2016-02-16 8:51 ` [PATCH v2 0/4] locking/mutex: Enable optimistic spinning of lock waiter Peter Zijlstra
2016-02-17 1:39 ` Waiman Long
2016-03-22 3:19 ` Waiman Long
2016-03-22 9:59 ` Peter Zijlstra [this message]
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