On 11/06/2012 11:53 AM, Srivatsa S. Bhat wrote: > This is the main change - we keep the pageblocks in region-sorted order, > where pageblocks belonging to region-0 come first, followed by those belonging > to region-1 and so on. But the pageblocks within a given region need *not* be > sorted, since we need them to be only region-sorted and not fully > address-sorted. > > This sorting is performed when adding pages back to the freelists, thus > avoiding any region-related overhead in the critical page allocation > paths.
It's probably _better_ to do it at free time than alloc, but it's still pretty bad to be doing a linear walk over a potentially 256-entry array holding the zone lock. The overhead is going to show up somewhere. How does this do with a kernel compile? Looks like exit() when a process has a bunch of memory might get painful. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
