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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.
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