Re: [patch] SMP alternatives

On Wed, 23 Nov 2005, H. Peter Anvin wrote:
> 
> Yes.  Any shared mmaps may require working lock.

Not "any". Only writable shared mmap. Which is actually the rare case.

Even then, we might want to have such processes have a way to say "I don't 
do futexes in this mmap" or similar. Quite often, writable shared mmaps 
aren't interested in locked cycles - they are there to just write things 
to disk, and all the serialization is done in the kernel when the user 
does a "munmap()" or a "msync()".

		Linus
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