Re: [PATCH 1/6] mlock: only hold mmap_sem in shared mode whenfaulting in pages

[Linus Torvalds]

On Wednesday, December 8, 2010, Michel Lespinasse <walken@xxxxxxxxxx> wrote:
>
> Yes, patch 1/6 changes the long hold time to be in read mode instead
> of write mode, which is only a band-aid. But, this prepares for patch
> 5/6, which releases mmap_sem whenever there is contention on it or
> when blocking on disk reads.

I have to say that I'm not a huge fan of that horribly kludgy
contention check case.

The "move page-in to read-locked sequence" and the changes to
get_user_pages look fine, but the contention thing is just disgusting.
I'd really like to see some other approach if at all possible.
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