linux-kernel - Re: [PATCH] sched: make pushable_tasks CONFIG

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Date:	Tue, 30 Nov 2010 14:02:12 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dario Faggioli <raistlin@...ux.it>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Gregory Haskins <ghaskins@...ell.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH] sched: make pushable_tasks CONFIG_SMP dependant.

On Tue, 2010-11-30 at 19:51 +0100, Dario Faggioli wrote:
> As noted by Peter Zijlstra here https://lkml.org/lkml/2010/11/10/391
> (while reviewing other stuff, though), tracking pushable tasks
> only makes sense on SMPs.

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve

> 
> Signed-off-by: Dario Faggioli <raistlin@...ux.it>
> ---
>  include/linux/init_task.h |    9 ++++++++-
>  include/linux/sched.h     |    2 ++
>  kernel/sched.c            |    2 ++
>  3 files changed, 12 insertions(+), 1 deletions(-)
> 
> diff --git a/include/linux/init_task.h b/include/linux/init_task.h
> index 1f8c06c..6ed8812 100644
> --- a/include/linux/init_task.h
> +++ b/include/linux/init_task.h
> @@ -12,6 +12,13 @@
>  #include <linux/securebits.h>
>  #include <net/net_namespace.h>
>  
> +#ifdef CONFIG_SMP
> +# define INIT_PUSHABLE_TASKS(tsk)					\
> +	.pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO),
> +#else
> +# define INIT_PUSHABLE_TASKS(tsk)
> +#endif
> +
>  extern struct files_struct init_files;
>  extern struct fs_struct init_fs;
>  
> @@ -137,7 +144,7 @@ extern struct cred init_cred;
>  		.nr_cpus_allowed = NR_CPUS,				\
>  	},								\
>  	.tasks		= LIST_HEAD_INIT(tsk.tasks),			\
> -	.pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO), \
> +	INIT_PUSHABLE_TASKS(tsk)					\
>  	.ptraced	= LIST_HEAD_INIT(tsk.ptraced),			\
>  	.ptrace_entry	= LIST_HEAD_INIT(tsk.ptrace_entry),		\
>  	.real_parent	= &tsk,						\
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index b0fc8ee..eae4131 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1244,7 +1244,9 @@ struct task_struct {
>  #endif
>  
>  	struct list_head tasks;
> +#ifdef CONFIG_SMP
>  	struct plist_node pushable_tasks;
> +#endif
>  
>  	struct mm_struct *mm, *active_mm;
>  #if defined(SPLIT_RSS_COUNTING)
> diff --git a/kernel/sched.c b/kernel/sched.c
> index 0debad9..166f9f8 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -2595,7 +2595,9 @@ void sched_fork(struct task_struct *p, int clone_flags)
>  	/* Want to start with kernel preemption disabled. */
>  	task_thread_info(p)->preempt_count = 1;
>  #endif
> +#ifdef CONFIG_SMP
>  	plist_node_init(&p->pushable_tasks, MAX_PRIO);
> +#endif
>  
>  	put_cpu();
>  }
> -- 
> 1.7.2.3
> 


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