Messages in this thread | | | Date | Tue, 3 Apr 2007 22:09:36 +0200 | From | Andi Kleen <> | Subject | Re: missing madvise functionality |
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> 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.
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