Re: [patch] SMP alternatives

[Linus Torvalds]

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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/