linux-ext4 - Re: INFO: rcu detected stall in ext4_write

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Date:   Mon, 15 Jul 2019 15:22:50 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Paul E. McKenney" <paulmck@...ux.ibm.com>
Cc:     Theodore Ts'o <tytso@....edu>, Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+4bfbbf28a2e50ab07368@...kaller.appspotmail.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        David Miller <davem@...emloft.net>, eladr@...lanox.com,
        Ido Schimmel <idosch@...lanox.com>,
        Jiri Pirko <jiri@...lanox.com>,
        John Stultz <john.stultz@...aro.org>,
        linux-ext4@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: INFO: rcu detected stall in ext4_write_checks

On Sat, Jul 06, 2019 at 06:16:55PM -0700, Paul E. McKenney wrote:
> 4.	SCHED_DEADLINE treats the other three scheduling classes as each
> 	having a period, deadline, and a modest CPU consumption budget
> 	for the members of the class in aggregate.  But this has to have
> 	been discussed before.  How did that go?

Yeah; this has been proposed a number of times; and I think everybody
agrees that it is a good idea, but nobody has so far sat down and wrote
the patches.

Or rather; we would've gotten this for 'free' with the rt-cgroup
rewrite, but that's been stuck forever due to affinity being difficult.