On Mon, Oct 08, 2012 at 11:39:19PM -0700, Kent Overstreet wrote: > It simplifies a lot of stuff if the ringbuffer is contiguously mapped > into kernel space, and we can delete a lot of code - in particular, this > is useful for converting read_events() to cmpxchg. 1) I'm concerned that Our Favourite Database Benchmarkers will see an effect of having more TLB pressure from that mapping. kmap_atomic() should be cheaper. We'll need to measure the difference. 2) I'm not at all convinced that the current ring semantics are safe with cmpxchg(), more in the next patch. - z -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
