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.
next prev parent 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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