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From: Peter Zijlstra <peterz@infradead.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Corey Minyard <cminyard@mvista.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Steven Rostedt <rostedt@goodmis.org>,
	linux-rt-users <linux-rt-users@vger.kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Tejun Heo <tj@kernel.org>
Subject: Re: Warning from swake_up_all in 4.14.15-rt13 non-RT
Date: Mon, 12 Mar 2018 15:29:33 +0100	[thread overview]
Message-ID: <20180312142933.GF4043@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20180312141107.roveviectc6a75s7@linutronix.de>

On Mon, Mar 12, 2018 at 03:11:07PM +0100, Sebastian Andrzej Siewior wrote:
> I assumed you complained about the unbounded list-walk with interrupts
> disabled (which is cheap but unbound is unbound). So here I suggested I
> move 20 entries off that list a time and enable interrupts again so an
> interrupt could set need_resched.
> But if we get invoked !preemptible then nothing changes.

Right, so any !preemptible invocation of wake_all is bad.

  reply	other threads:[~2018-03-12 14:29 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-05 15:08 Warning from swake_up_all in 4.14.15-rt13 non-RT Corey Minyard
2018-03-06 17:46 ` Sebastian Andrzej Siewior
2018-03-06 22:51   ` Corey Minyard
2018-03-07 15:45   ` Corey Minyard
2018-03-08 17:41     ` Sebastian Andrzej Siewior
2018-03-08 19:54       ` Corey Minyard
2018-03-09 11:04         ` Sebastian Andrzej Siewior
2018-03-09 13:29           ` Corey Minyard
2018-03-09 14:58             ` Sebastian Andrzej Siewior
2018-03-09 16:03               ` Corey Minyard
2018-03-09 17:46           ` Peter Zijlstra
2018-03-09 20:25             ` Sebastian Andrzej Siewior
2018-03-09 22:26               ` Peter Zijlstra
2018-03-12 10:51                 ` Sebastian Andrzej Siewior
2018-03-12 13:27                   ` Peter Zijlstra
2018-03-12 14:11                     ` Sebastian Andrzej Siewior
2018-03-12 14:29                       ` Peter Zijlstra [this message]
2018-03-12 19:51                         ` Sebastian Andrzej Siewior
2018-03-13 18:40                           ` [RT PATCH 1/2] Revert "block: blk-mq: Use swait" Sebastian Andrzej Siewior
2018-03-13 18:42                             ` [RT PATCH 2/2] block: blk-mq: move blk_queue_usage_counter_release() into process context Sebastian Andrzej Siewior
2018-03-13 20:10                               ` Peter Zijlstra
2018-03-14 15:23                                 ` Sebastian Andrzej Siewior
2018-03-09 22:02             ` Warning from swake_up_all in 4.14.15-rt13 non-RT Corey Minyard

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