linux-kernel - Re: [BUG] [ tip/sched/core ] System unresponsive after booting

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Date:	Wed, 15 Jan 2014 17:25:55 +0800
From:	Michael wang <wangyun@...ux.vnet.ibm.com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>, raistlin@...ux.it,
	juri.lelli@...il.com
CC:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] [ tip/sched/core ] System unresponsive after booting

Hi, Daniel

On 01/15/2014 04:27 PM, Daniel Lezcano wrote:
[snip]
> commit d50dde5a10f305253cbc3855307f608f8a3c5f73
> Author: Dario Faggioli <raistlin@...ux.it>
> Date:   Thu Nov 7 14:43:36 2013 +0100
> 
>     sched: Add new scheduler syscalls to support an extended scheduling
> parameters ABI
> 
>     Add the syscalls needed for supporting scheduling algorithms
>     with extended scheduling parameters (e.g., SCHED_DEADLINE).

Will this do any helps?

Regards,
Michael Wang

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 0326c06..bf4a6ed 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3464,6 +3464,10 @@ int sched_setscheduler(struct task_struct *p, int
policy,
                .sched_policy   = policy,
                .sched_priority = param->sched_priority
        };
+
+       if (fair_policy(policy))
+               attr.sched_nice = PRIO_TO_NICE(attr.sched_priority);
+
        return __sched_setscheduler(p, &attr, true);
 }
 EXPORT_SYMBOL_GPL(sched_setscheduler);
@@ -3494,6 +3498,10 @@ int sched_setscheduler_nocheck(struct task_struct
*p, int policy,
                .sched_policy   = policy,
                .sched_priority = param->sched_priority
        };
+
+       if (fair_policy(policy))
+               attr.sched_nice = PRIO_TO_NICE(attr.sched_priority);
+
        return __sched_setscheduler(p, &attr, false);
 }



> 
> 
> [ ... ]
> 
> 
>     Signed-off-by: Dario Faggioli <raistlin@...ux.it>
>     [ Rewrote to use sched_attr. ]
>     Signed-off-by: Juri Lelli <juri.lelli@...il.com>
>     [ Removed sched_setscheduler2() for now. ]
>     Signed-off-by: Peter Zijlstra <peterz@...radead.org>
>     Link:
> http://lkml.kernel.org/r/1383831828-15501-3-git-send-email-juri.lelli@gmail.com
> 
>     Signed-off-by: Ingo Molnar <mingo@...nel.org>
> 

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