David Gibson wrote on Wednesday, March 08, 2006 4:23 PM
> > But you already make reservation at mmap time. If you reserve it again
> > when extending the file, won't you double count?
>
> Well, I'd generally expect extending truncate() to come before mmap(),
> but in any case hugetlb_extend_reservation() is safe against double
> counting (it's idempotent if called twice with the same number of
> pages). The semantics are "ensure the this many pages total are
> guaranteed available, that is, either reserved or already
> instantiated".
It's kind of peculiar that kernel reserve hugetlb page at the time of
extending truncate. Maybe there is a close correlation between mmap
size to the file size. But these two aren't the same and and shouldn't
be mixed.
- Ken
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