Re: [PATCH 0/4] hugetlbfs: optionally reserve all fs pages at mount time

[Mike Kravetz]

On 03/03/2015 09:49 PM, David Rientjes wrote:
> On Tue, 3 Mar 2015, Mike Kravetz wrote:
> > Add a new hugetlbfs mount option 'reserved' to specify that the number
> > of pages associated with the size of the filesystem will be reserved.  If
> > there are insufficient pages, the mount will fail.  The reservation is
> > maintained for the duration of the filesystem so that as pages are
> > allocated and free'ed a sufficient number of pages remains reserved.
>
> This functionality is somewhat limited because it's not possible to
> reserve a subset of the size for a single mount point, it's either all or
> nothing.  It shouldn't be too difficult to just add a reserved=<value>
> option where <value> is <= size.  If it's done that way, you should be
> able to omit size= entirely for unlimited hugepages but always ensure that
> a low watermark of hugepages are reserved for the database.

Thanks, I like that suggestion.  You are correct in that it should not
be too difficult to pass in a size for reserved.  I'll work on the
modification.

--
Mike Kravetz
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