Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> writes: >> >> Considering that we have architectures that won't support migrating >> explicit hugepages with this patch series, is it ok to use >> GFP_HIGHUSER_MOVABLE for hugepage allocation ? > > Originally this parameter was introduced to make hugepage pool on ZONE_MOVABLE. > The benefit is that we can extend the hugepage pool more easily, > because external fragmentation less likely happens than other zone type > by rearranging fragmented pages with page migration/reclaim. > > So I think using ZONE_MOVABLE for hugepage allocation by default makes sense > even on the architectures which don't support hugepage migration. But allocating hugepages from ZONE_MOVABLE means we have pages in that zone which we can't migrate. Doesn't that impact other features like hotplug ? -aneesh -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>