This implements allocation isolation for CDM nodes in buddy allocator by discarding CDM memory zones all the time except in the cases where the gfp flag has got __GFP_THISNODE or the nodemask contains CDM nodes in cases where it is non NULL (explicit allocation request in the kernel or user process MPOL_BIND policy based requests). Signed-off-by: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx> --- mm/page_alloc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 84d61bb..392c24a 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -64,6 +64,7 @@ #include <linux/page_owner.h> #include <linux/kthread.h> #include <linux/memcontrol.h> +#include <linux/node.h> #include <asm/sections.h> #include <asm/tlbflush.h> @@ -2908,6 +2909,21 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags, struct page *page; unsigned long mark; + /* + * CDM nodes get skipped if the requested gfp flag + * does not have __GFP_THISNODE set or the nodemask + * does not have any CDM nodes in case the nodemask + * is non NULL (explicit allocation requests from + * kernel or user process MPOL_BIND policy which has + * CDM nodes). + */ + if (is_cdm_node(zone->zone_pgdat->node_id)) { + if (!(gfp_mask & __GFP_THISNODE)) { + if (!ac->nodemask) + continue; + } + } + if (cpusets_enabled() && (alloc_flags & ALLOC_CPUSET) && !__cpuset_zone_allowed(zone, gfp_mask)) -- 2.9.3 -- 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>