linux-kernel - Re: [PATCH] cpumask: modifiy oprofile initialization

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Date:	Thu, 22 Jan 2009 08:56:51 -0800
From:	Mike Travis <travis@....com>
To:	Robert Richter <robert.richter@....com>
CC:	Ingo Molnar <mingo@...e.hu>, Tony Luck <tony.luck@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH] cpumask: modifiy oprofile initialization

Robert Richter wrote:
> Delta patch to f7df8ed164996cd2c6aca9674388be6ef78d8b37 for
> tip/cpus4096.
> 
> Moved initialization to sync_start()/sync_stop(). No changes needed in
> buffer_sync.h and oprof.c anymore.

Great, thanks Robert!

Are you pushing this via some upstream queue so I can drop it from mine?

Thanks,
Mike

> 
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Mike Travis <travis@....com>
> Signed-off-by: Robert Richter <robert.richter@....com>
> ---
>  drivers/oprofile/buffer_sync.c |   20 ++++++--------------
>  drivers/oprofile/buffer_sync.h |    4 ----
>  drivers/oprofile/oprof.c       |    9 +--------
>  3 files changed, 7 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/oprofile/buffer_sync.c b/drivers/oprofile/buffer_sync.c
> index c3ea5fa..8574622 100644
> --- a/drivers/oprofile/buffer_sync.c
> +++ b/drivers/oprofile/buffer_sync.c
> @@ -154,6 +154,10 @@ int sync_start(void)
>  {
>  	int err;
>  
> +	if (!alloc_cpumask_var(&marked_cpus, GFP_KERNEL))
> +		return -ENOMEM;
> +	cpumask_clear(marked_cpus);
> +
>  	start_cpu_work();
>  
>  	err = task_handoff_register(&task_free_nb);
> @@ -179,6 +183,7 @@ out2:
>  	task_handoff_unregister(&task_free_nb);
>  out1:
>  	end_sync();
> +	free_cpumask_var(marked_cpus);
>  	goto out;
>  }
>  
> @@ -190,6 +195,7 @@ void sync_stop(void)
>  	profile_event_unregister(PROFILE_TASK_EXIT, &task_exit_nb);
>  	task_handoff_unregister(&task_free_nb);
>  	end_sync();
> +	free_cpumask_var(marked_cpus);
>  }
>  
>  
> @@ -565,20 +571,6 @@ void sync_buffer(int cpu)
>  	mutex_unlock(&buffer_mutex);
>  }
>  
> -int __init buffer_sync_init(void)
> -{
> -	if (!alloc_cpumask_var(&marked_cpus, GFP_KERNEL))
> -		return -ENOMEM;
> -
> -	cpumask_clear(marked_cpus);
> -		return 0;
> -}
> -
> -void __exit buffer_sync_cleanup(void)
> -{
> -	free_cpumask_var(marked_cpus);
> -}
> -
>  /* The function can be used to add a buffer worth of data directly to
>   * the kernel buffer. The buffer is assumed to be a circular buffer.
>   * Take the entries from index start and end at index end, wrapping
> diff --git a/drivers/oprofile/buffer_sync.h b/drivers/oprofile/buffer_sync.h
> index 0ebf5db..3110732 100644
> --- a/drivers/oprofile/buffer_sync.h
> +++ b/drivers/oprofile/buffer_sync.h
> @@ -19,8 +19,4 @@ void sync_stop(void);
>  /* sync the given CPU's buffer */
>  void sync_buffer(int cpu);
>  
> -/* initialize/destroy the buffer system. */
> -int buffer_sync_init(void);
> -void buffer_sync_cleanup(void);
> -
>  #endif /* OPROFILE_BUFFER_SYNC_H */
> diff --git a/drivers/oprofile/oprof.c b/drivers/oprofile/oprof.c
> index ced39f6..3cffce9 100644
> --- a/drivers/oprofile/oprof.c
> +++ b/drivers/oprofile/oprof.c
> @@ -183,10 +183,6 @@ static int __init oprofile_init(void)
>  {
>  	int err;
>  
> -	err = buffer_sync_init();
> -	if (err)
> -		return err;
> -
>  	err = oprofile_arch_init(&oprofile_ops);
>  
>  	if (err < 0 || timer) {
> @@ -195,10 +191,8 @@ static int __init oprofile_init(void)
>  	}
>  
>  	err = oprofilefs_register();
> -	if (err) {
> +	if (err)
>  		oprofile_arch_exit();
> -		buffer_sync_cleanup();
> -	}
>  
>  	return err;
>  }
> @@ -208,7 +202,6 @@ static void __exit oprofile_exit(void)
>  {
>  	oprofilefs_unregister();
>  	oprofile_arch_exit();
> -	buffer_sync_cleanup();
>  }
>  
>  

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