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Date: Tue, 5 May 2015 18:31:20 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: Steven Rostedt <rostedt@...dmis.org>
cc: Mike Galbraith <umgwanakikbuti@...il.com>,
Ronny Meeus <ronny.meeus@...il.com>,
LKML <linux-kernel@...r.kernel.org>,
Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] sched: Handle priority boosted tasks proper in
setscheduler()
On Tue, 5 May 2015, Steven Rostedt wrote:
> I got pulled onto other things so I never finished it, but one thing
> that worried me about this fix is this:
>
> T1 - FIFO policy (prio = 10)
> lock(rtmutex);
>
> T2 (prio = 20)
> lock(rtmutex)
> boost T1 (prio = 20)
>
> TI (prio = 20)
> sys_sched_setscheduler(prio = 30)
> TI (prio = 30)
>
> T1 (prio = 30)
> sys_sched_setscheduler(SCHED_OTHER)
> new_effective_prio = 20, oldprio = 30
>
> Before the code stopped at the rt_mutex_check_prio(), but now it
> continues. Will having the policy change cause problems here?
No, because it stays effective in the FIFO domain.
Thanks,
tglx
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