linux-kernel - Re: [RFC 1/3] hugetlbfs: add reserved mount fields to subpool structure

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Message-Id: <20150302151018.ce35298f22d04d6d0296e53c@linux-foundation.org>
Date:	Mon, 2 Mar 2015 15:10:18 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mike Kravetz <mike.kravetz@...cle.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Nadia Yvette Chambers <nyc@...omorphy.com>,
	Davidlohr Bueso <davidlohr@...com>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [RFC 1/3] hugetlbfs: add reserved mount fields to subpool
 structure

On Fri, 27 Feb 2015 14:58:10 -0800 Mike Kravetz <mike.kravetz@...cle.com> wrote:

> Add a boolean to the subpool structure to indicate that the pages for
> subpool have been reserved.  The hstate pointer in the subpool is
> convienient to have when it comes time to unreserve the pages.
> subool_reserved() is a handy way to check if reserved and take into
> account a NULL subpool.
> 
> ...
>
> @@ -38,6 +40,10 @@ extern int hugetlb_max_hstate __read_mostly;
>  #define for_each_hstate(h) \
>  	for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
>  
> +static inline bool subpool_reserved(struct hugepage_subpool *spool)
> +{
> +	return spool && spool->reserved;
> +}

"subpool_reserved" is not a good identifier.

>  struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
>  void hugepage_put_subpool(struct hugepage_subpool *spool);

See what they did?


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