linux-kernel - Re: [PATCH] sched: Relax a restriction in sched_rt_can

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Date:	Tue, 5 May 2015 21:00:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Zefan Li <lizefan@...wei.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH] sched: Relax a restriction in sched_rt_can_attach()

On Tue, May 05, 2015 at 12:31:12PM -0400, Tejun Heo wrote:
> 
> What I don't want to happen is controllers failing migrations
> willy-nilly for random reasons leaving users baffled, which we've
> actually been doing unfortunately.  Maybe we need to deal with this
> fixed resource arbitration as a separate class and allow them to fail
> migration w/ -EBUSY.

Ah, _that_ was the problem.

Which is something created by this co-mounting of controllers.

You could of course store the ss-id of the failing operation in
task_struct and have a file reporting the name of the ss-id.

That way, there is a simple way to find out which controller failed the
migrate.

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