linux-kernel - Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and `mem_cgroup_shrink

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Message-ID: <20161201184947.GR3045@worktop.programming.kicks-ass.net>
Date:   Thu, 1 Dec 2016 19:49:47 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Donald Buczek <buczek@...gen.mpg.de>,
        Paul Menzel <pmenzel@...gen.mpg.de>, dvteam@...gen.mpg.de,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Josh Triplett <josh@...htriplett.org>
Subject: Re: INFO: rcu_sched detected stalls on CPUs/tasks with `kswapd` and
 `mem_cgroup_shrink_node`

On Thu, Dec 01, 2016 at 10:42:52AM -0800, Paul E. McKenney wrote:
> On Thu, Dec 01, 2016 at 07:09:53PM +0100, Peter Zijlstra wrote:
> > Thing is, I'm slightly uncomfortable with de-coupling rcu-sched from
> > actual schedule() calls.
> 
> OK, what is the source of your discomfort?

Good question; after a little thought its not much different from other
cases. So let me ponder this a bit more..