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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Mike Galbraith <efault@gmx.de>, Peter Zijlstra <peterz@infradead.org>,
	Marco Elver <elver@google.com>, linux-rt-users@vger.kernel.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	Clark Williams <williams@redhat.com>,
	Alessandro Carminati <acarmina@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Artem Savkov <asavkov@redhat.com>
Subject: Re: 'perf test sigtrap' failing on PREEMPT_RT_FULL
Message-ID: <20240306165443.5AKJ403t@linutronix.de>
References: <ZdZOYnIkjqkyfo5P@x1>
 <ZeiZWjRUmXszp0CN@x1>
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In-Reply-To: <ZeiZWjRUmXszp0CN@x1>

On 2024-03-06 13:27:06 [-0300], Arnaldo Carvalho de Melo wrote:
> That its what introduces perf_pending_task(), I'm now unsure we can just
> disable migration, as event_sched_out() seems to require being called
> under a raw_spin_lock and that disables preemption...

Not sure what the best course of action is here but based on what I
learned last time you reported this I think we need delayed signals=E2=80=A6
Let me look into this. We had it and then removed it because we had no
users of it at some point but probably nobody took perf into account.

> - Arnaldo

Sebastian