Re: [RFC 2/3] hugetlbfs: coordinate global and subpool reserve accounting

[Mike Kravetz]

On 03/02/2015 03:10 PM, Andrew Morton wrote:
> On Fri, 27 Feb 2015 14:58:11 -0800 Mike Kravetz <mike.kravetz@xxxxxxxxxx> wrote:
>
> > If the pages for a subpool are reserved, then the reservations have
> > already been accounted for in the global pool.  Therefore, when
> > requesting a new reservation (such as for a mapping) for the subpool
> > do not count again in global pool.  However, when actually allocating
> > a page for the subpool decrement global reserve count to correspond to
> > with decrement in global free pages.
>
> The last sentence made my brain hurt.

Sorry.  I was trying to point out that the global free and reserve
accounting is still the same when doing a page allocation, even
though the entire size of the subpool was reserved.  For example,
when allocating a page the global free and reserve counts are both
decremented.

--
Mike Kravetz
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