linux-kernel - Re: [PATCH v2 1/2] mm/hugetlb: compute/return the number of regions added by region

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Date:	Mon, 25 May 2015 13:29:45 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Mike Kravetz <mike.kravetz@...cle.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	David Rientjes <rientjes@...gle.com>,
	Luiz Capitulino <lcapitulino@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 1/2] mm/hugetlb: compute/return the number of regions
 added by region_add()

On Fri, 2015-05-22 at 20:55 -0700, Mike Kravetz wrote:
> + * The region data structures are embedded into a resv_map and protected
> + * by a resv_map's lock.  The set of regions within the resv_map represent
> + * reservations for huge pages, or huge pages that have already been
> + * instantiated within the map.  The from and to elements are huge page
> + * indicies into the associated mapping.  from indicates the starting index
> + * of the region.  to represents the first index past the end of  the region.

newline

> + * For example, a file region structure with from == 0 and to == 4 represents
> + * four huge pages in a mapping.  It is important to note that the to element
> + * represents the first element past the end of the region. This is used in
> + * arithmetic as 4(to) - 0(from) = 4 huge pages in the region.
>   */
>  struct file_region {
>  	struct list_head link;
> @@ -221,10 +229,23 @@ struct file_region {
>  	long to;
>  };
>  
> +/*
> + * Add the huge page range represented by indicies f (from)
> + * and t (to) to the reserve map.  Existing regions will be

How about simply renaming those parameters to from and to across the
entire hugetlb code.

Thanks,
Davidlohr

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