From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: [PATCH] xen/balloon: export balloon hotplug page
	stats to sysfs
Date: Thu, 20 Mar 2014 13:21:17 +0000
Message-ID: <532AEB4D.1050900@citrix.com>
References: <1395320213-29921-1-git-send-email-wei.liu2@citrix.com>
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To: Wei Liu <wei.liu2@citrix.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>, xen-devel@lists.xen.org
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On 20/03/14 12:56, Wei Liu wrote:
> --- a/drivers/xen/xen-balloon.c
> +++ b/drivers/xen/xen-balloon.c
> @@ -129,6 +129,11 @@ module_exit(balloon_exit);
>  BALLOON_SHOW(current_kb, "%lu\n", PAGES2KB(balloon_stats.current_pages));
>  BALLOON_SHOW(low_kb, "%lu\n", PAGES2KB(balloon_stats.balloon_low));
>  BALLOON_SHOW(high_kb, "%lu\n", PAGES2KB(balloon_stats.balloon_high));
> +#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
> +BALLOON_SHOW(hotplug_kb, "%lu\n", PAGES2KB(balloon_stats.hotplug_pages));
> +BALLOON_SHOW(balloon_hotplug_kb, "%lu\n",
> +	     PAGES2KB(balloon_stats.balloon_hotplug));
> +#endif

Extending the kernel's ABI requires justification.  How are these values
useful for userspace tools?  If it's just for debug purposes, using
debugfs would be preferred.

David