Re: do we want to kill VM_RESERVED or not? [was Re: 2.6.5-rc1-aa3]

[Andrea Arcangeli]

On Sun, Mar 21, 2004 at 03:24:27PM -0800, Andrew Morton wrote:
> I'd prefer to retain VM_RESERVED and work toward removing PageReserved(). 
> The latter has a real and measurable cost in put_page().

agreed. Unfortunately removing PageReserved won't be so trivial since
it'll be a change to userspace API too, today a PageReserved page
through fork() will act as a MAP_SHARED even if it's under a
MAP_PRIVATE, so slightly subtle userspace stuff can break then.
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