On Thu, 2011-06-23 at 23:11 -0700, Nitin Gupta wrote: > Much of this vpage functionality seems to be already present in mainline > as "flexible arrays"[1] That's a good observation. I don't know who wrote that junk, but I bet they never thought of using it for this purpose. :) FWIW, for flex_arrays, the biggest limitation is that the objects currently can not cross page boundaries. The current API also doesn't have any concept of a release function. We'd need those to do the unmapping after a get(). It certainly wouldn't be impossible to fix, but it would probably make it quite a bit more complicated. The other limitation is that each array can only hold a small number of megabytes worth of data in each array. We only have a single-level table lookup, and that first-level table is limited to PAGE_SIZE (minus a wee bit of metadata). -- Dave -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>