Re: [PATCH 17/20] FRV: Better mmap support in uClinux

[Matt Mackall]

On Mon, Nov 08, 2004 at 02:34:20PM +0000, dhowells@xxxxxxxxxx wrote:

>  (3) Files (and blockdevs) cannot be mapped shared since it is not
>  really possible to honour this by writing any changes back to the
>  backing device.

[way behind on email]

I think this could be done at msync, munmap and exit time? You end up
flushing the entire mapping, but it's still correct (and POSIX
compliant).

And, if you wanted to be really clever, you could store a hash of each
page to detect changes and avoid the extra I/O.

-- 
Mathematics is the supreme nostalgia of our time.
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