From: Peter Zijlstra <peterz@infradead.org>
To: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Ran Wang <ran.wang_1@nxp.com>,
Thomas Gleixner <tglx@linutronix.de>,
Jiafei Pan <jiafei.pan@nxp.com>,
linux-rt-users@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [RFC] rt: kernel/sched/core: fix kthread_park() pending too long when CPU un-plugged
Date: Fri, 8 Jan 2021 10:32:36 +0100 [thread overview]
Message-ID: <X/gmtIqgT27OvDX6@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20210107152843.gyljmpctkwybfewh@linutronix.de>
On Thu, Jan 07, 2021 at 04:28:43PM +0100, Sebastian Siewior wrote:
> This sleep can be triggered by ptrace/strace() and with brief testing I
> can trigger the sleep there but I don't get it anywhere near where I
> would notice it with cyclictest.
It's a single task wakeup (the caller), doing that from hardirq context
really should not be a problem, we do lots of that in RT already.
next prev parent reply other threads:[~2021-01-08 9:34 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-07 9:18 Ran Wang
2021-01-07 9:13 ` Ran Wang
2021-01-07 10:45 ` Peter Zijlstra
2021-01-07 15:28 ` Sebastian Siewior
2021-01-08 8:45 ` Ran Wang
2021-01-08 9:05 ` Sebastian Siewior
2021-01-08 9:27 ` Ran Wang
2021-01-08 9:32 ` Peter Zijlstra [this message]
2021-01-08 11:19 ` Sebastian Siewior
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