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Date:   Mon, 15 Jul 2019 15:22:50 +0200
From:   Peter Zijlstra <>
To:     "Paul E. McKenney" <>
Cc:     Theodore Ts'o <>, Dmitry Vyukov <>,
        syzbot <>,
        Andreas Dilger <>,
        David Miller <>,,
        Ido Schimmel <>,
        Jiri Pirko <>,
        John Stultz <>,, LKML <>,
        netdev <>,
        syzkaller-bugs <>,
        Thomas Gleixner <>,
        Ingo Molnar <>
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.

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