Re: missing madvise functionality

[Andi Kleen]

> It might, a bit.  Both mmap() and mprotect() currently take mmap_sem() for
> writing.  If we're careful, we could probably arrange for MADV_ULRICH to
> take it for reading, which will help a little bit, hopefully.

The cache line bounces would be still there. Not sure that would help MySQL
all that much. 

Besides if the down_write is the real problem one could convert 
the code for all cases over to optimistic locking assuming most calls 
don't merge.

-Andi
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