From: Peter Zijlstra <peterz@infradead.org>
To: Nicholas Piggin <npiggin@gmail.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: sched_rt_period_timer causing large latencies
Date: Thu, 5 Apr 2018 10:27:01 +0200 [thread overview]
Message-ID: <20180405082701.GL4082@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20180405091138.6ef14d15@roar.ozlabs.ibm.com>
On Thu, Apr 05, 2018 at 09:11:38AM +1000, Nicholas Piggin wrote:
> Hi,
>
> I'm seeing some pretty big latencies on a ~idle system when a CPU wakes
> out of a nohz idle. Looks like it's due to the taking a lot of remote
> locks and cache lines. irqoff trace:
On RT I think we default RT_RUNTIME_SHARE to false, maybe we should do
the same for mainline. It's always been a dodgy feature and if we ever
figure out how to do FIFO servers this code will be deleted entirely.
next prev parent reply other threads:[~2018-04-05 8:27 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-04 23:11 sched_rt_period_timer causing large latencies Nicholas Piggin
2018-04-05 6:46 ` Mike Galbraith
2018-04-05 7:44 ` Nicholas Piggin
2018-04-05 8:11 ` Mike Galbraith
2018-04-05 8:27 ` Peter Zijlstra [this message]
2018-04-05 8:40 ` Mike Galbraith
2018-04-05 10:08 ` Nicholas Piggin
2018-04-05 10:44 ` Nicholas Piggin
2018-04-06 16:23 ` Peter Zijlstra
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