Commit a8cc75dd authored Nov 29, 2021 by Anshuman Khandual Committed by Zheng Zengkai Nov 29, 2021

mm: Enable Buddy allocation isolation for CDM nodes

ascend inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4JMLR


CVE: NA
-------------------

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@linux.vnet.ibm.com>
Signed-off-by: Lijun Fang <fanglijun3@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>

parent 5f387449

mm/page_alloc.c

+15 −0

Original line number	Original line	Diff line number	Diff line
	@@ -3812,6 +3812,21 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags,
	struct page *page;		struct page *page;
	unsigned long mark;		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() &&		if (cpusets_enabled() &&
	(alloc_flags & ALLOC_CPUSET) &&		(alloc_flags & ALLOC_CPUSET) &&
	!__cpuset_zone_allowed(zone, gfp_mask))		!__cpuset_zone_allowed(zone, gfp_mask))