On 11/18/2013 10:54 AM, Naoya Horiguchi wrote: > diff --git a/mm/migrate.c b/mm/migrate.c > index cb5d152b58bc..661ff5f66591 100644 > --- a/mm/migrate.c > +++ b/mm/migrate.c > @@ -454,7 +454,8 @@ static void __copy_gigantic_page(struct page *dst, struct > page *src, > struct page *src_base = src; > > for (i = 0; i < nr_pages; ) { > - cond_resched(); > + if (i % MAX_ORDER_NR_PAGES == 0) > + cond_resched(); > copy_highpage(dst, src);
This is certainly OK on x86, but remember that MAX_ORDER can be overridden by a config variable. Just picking one at random: config FORCE_MAX_ZONEORDER int "Maximum zone order" range 9 64 if PPC64 && PPC_64K_PAGES ... Would it be OK to only resched once every 2^63 pages? ;) Really, though, a lot of things seem to have MAX_ORDER set up so that it's at 256MB or 512MB. That's an awful lot to do between rescheds. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/