linux-kernel - Re: [PATCH v2 3/2] sched/deadline: Check bandwidth overflow earlier for hotplug

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Message-ID: <Z7Ni62BnlU0MX6BA@jlelli-thinkpadt14gen4.remote.csb>
Date: Mon, 17 Feb 2025 17:25:15 +0100
From: Juri Lelli <juri.lelli@...hat.com>
To: Jon Hunter <jonathanh@...dia.com>
Cc: Christian Loehle <christian.loehle@....com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Thierry Reding <treding@...dia.com>,
	Waiman Long <longman@...hat.com>, Tejun Heo <tj@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Koutny <mkoutny@...e.com>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Phil Auld <pauld@...hat.com>, Qais Yousef <qyousef@...alina.io>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	"Joel Fernandes (Google)" <joel@...lfernandes.org>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Aashish Sharma <shraash@...gle.com>,
	Shin Kawamura <kawasin@...gle.com>,
	Vineeth Remanan Pillai <vineeth@...byteword.org>,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v2 3/2] sched/deadline: Check bandwidth overflow earlier
 for hotplug

On 17/02/25 16:10, Jon Hunter wrote:
> 
> On 17/02/2025 16:08, Juri Lelli wrote:
> > On 14/02/25 10:05, Jon Hunter wrote:
> > 
> > ...
> > 
> > > Sorry for the delay, the day got away from me. However, it is still not
> > > working :-(
> > 
> > Ouch.
> > 
> > > Console log is attached.
> > 
> > Thanks. Did you happen to also collect a corresponding trace?
> 
> Sorry, but I am not sure exactly what trace do you want?

Ah, sorry, I think I mentioned it somewhere else in this long thread.

The idea would be to boot with something like "ftrace=nop
trace_buf_size=50K" added to kernel cmdline.

I would then try to offline CPUs 'manually' in the order suspend seems
to be doing (starting from CPU5). Offlining CPU1 should still fail. At
that point collect the trace with

# cat /sys/kernel/debug/tracing/trace > trace.out

and share it together with dmesg output as you have been doing so far.

Thanks!
Juri