Re: [Lse-tech] Re: Hugetlbpages in very large memory machines.......

From: William Lee Irwin III
Date: Sun Mar 14 2004 - 04:08:57 EST

On Sun, Mar 14, 2004 at 12:57:37AM -0800, Andrew Morton wrote:
> Well that's just a dumb implementation. hugetlb_prefault() doesn't need
> page_table_lock while it is zeroing the page: just drop it, test for
> -EEXIST returned from add_to_page_cache().
> In fact we need to do that anyway: the current code is buggy if some other
> process with a different mm gets in there and instantiates the page in the
> pagecache before this process does: hugetlb_prefault() will return -EEXIST
> instead of simply accepting the race and using the page which someone else
> put there.

Don't blame me. I didn't write the expand-on-mmap() code.

-- wli
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