linux-kernel - Re: [PATCH 2/5] vtime: Provide an irq safe version of vtime_account

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Message-ID: <20121025074815.GC3712@gmail.com>
Date:	Thu, 25 Oct 2012 09:48:15 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-s390@...r.kernel.org
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: Re: [PATCH 2/5] vtime: Provide an irq safe version of
 vtime_account_system()


I've Cc:-ed the S390 folks - patch is quoted below.

Thanks,

	Ingo

* Frederic Weisbecker <fweisbec@...il.com> wrote:

> vtime_account_system() currently has only one caller with
> vtime_account() that is irq safe.
> 
> Now we are going to call it from other places like kvm, so
> let's provide an irqsafe version.
> 
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
> ---
>  arch/s390/kernel/vtime.c |    4 ++++
>  include/linux/vtime.h    |    2 ++
>  kernel/sched/cputime.c   |    9 +++++++++
>  3 files changed, 15 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
> index 7903344..80d1dbc 100644
> --- a/arch/s390/kernel/vtime.c
> +++ b/arch/s390/kernel/vtime.c
> @@ -140,6 +140,10 @@ void vtime_account(struct task_struct *tsk)
>  }
>  EXPORT_SYMBOL_GPL(vtime_account);
>  
> +void vtime_account_system(struct task_struct *tsk)
> +__attribute__((alias("vtime_account")));
> +EXPORT_SYMBOL_GPL(vtime_account_system);
> +
>  void __kprobes vtime_stop_cpu(void)
>  {
>  	struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
> diff --git a/include/linux/vtime.h b/include/linux/vtime.h
> index 7199c24..57f290e 100644
> --- a/include/linux/vtime.h
> +++ b/include/linux/vtime.h
> @@ -6,9 +6,11 @@ struct task_struct;
>  #ifdef CONFIG_VIRT_CPU_ACCOUNTING
>  extern void vtime_task_switch(struct task_struct *prev);
>  extern void vtime_account_system(struct task_struct *tsk);
> +extern void vtime_account_system_irqsafe(struct task_struct *tsk);
>  extern void vtime_account_idle(struct task_struct *tsk);
>  #else
>  static inline void vtime_task_switch(struct task_struct *prev) { }
> +static inline void vtime_account_system_irqsafe(struct task_struct *tsk) { }
>  #endif
>  
>  #if !defined(CONFIG_VIRT_CPU_ACCOUNTING) && !defined(CONFIG_IRQ_TIME_ACCOUNTING)
> diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
> index 81b763b..3ccbea0 100644
> --- a/kernel/sched/cputime.c
> +++ b/kernel/sched/cputime.c
> @@ -433,6 +433,15 @@ void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
>  	*st = cputime.stime;
>  }
>  
> +void vtime_account_system_irqsafe(struct task_struct *tsk)
> +{
> +	unsigned long flags;
> +
> +	local_irq_save(flags);
> +	vtime_account_system(tsk);
> +	local_irq_restore(flags);
> +}
> +
>  /*
>   * Archs that account the whole time spent in the idle task
>   * (outside irq) as idle time can rely on this and just implement
> -- 
> 1.7.5.4
> 
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