linux-kernel - Re: [patch 36/37] LTTng instrumentation mm

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Message-ID: <48153297.20502@redhat.com>
Date:	Sun, 27 Apr 2008 22:12:39 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC:	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Dave Hansen <haveblue@...ibm.com>
Subject: Re: [patch 36/37] LTTng instrumentation mm

Hi Mathieu,

Mathieu Desnoyers wrote:
> @@ -1844,3 +1848,22 @@ int valid_swaphandles(swp_entry_t entry,
>  	*offset = ++toff;
>  	return nr_pages? ++nr_pages: 0;
>  }
> +
> +void ltt_dump_swap_files(void *call_data)
> +{
> +	int type;
> +	struct swap_info_struct *p = NULL;
> +
> +	mutex_lock(&swapon_mutex);
> +	for (type = swap_list.head; type >= 0; type = swap_info[type].next) {
> +		p = swap_info + type;
> +		if ((p->flags & SWP_ACTIVE) != SWP_ACTIVE)
> +			continue;
> +		__trace_mark(0, statedump_swap_files, call_data,
> +			"filp %p vfsmount %p dname %s",
> +			p->swap_file, p->swap_file->f_vfsmnt,
> +			p->swap_file->f_dentry->d_name.name);
> +	}
> +	mutex_unlock(&swapon_mutex);
> +}
> +EXPORT_SYMBOL_GPL(ltt_dump_swap_files);


I'm not sure this kind of functions can be acceptable.
IMHO, you'd better use more generic method (ex. a callback function),
or just export swap_list and swapon_mutex. Thus, other subsystems can
use that interface.

Thank you,

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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