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[09/10] doc: add description for MPOL_HYBRID mode

Message ID 1553316275-21985-10-git-send-email-yang.shi@linux.alibaba.com (mailing list archive)
State New, archived
Headers show
Series Another Approach to Use PMEM as NUMA Node | expand

Commit Message

Yang Shi March 23, 2019, 4:44 a.m. UTC 
Add description for MPOL_HYBRID mode in kernel documentation.

Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
---
 Documentation/admin-guide/mm/numa_memory_policy.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox series

Patch

diff --git a/Documentation/admin-guide/mm/numa_memory_policy.rst b/Documentation/admin-guide/mm/numa_memory_policy.rst
index d78c5b3..3db8257 100644
--- a/Documentation/admin-guide/mm/numa_memory_policy.rst
+++ b/Documentation/admin-guide/mm/numa_memory_policy.rst
@@ -198,6 +198,16 @@  MPOL_BIND
 	the node in the set with sufficient free memory that is
 	closest to the node where the allocation takes place.
 
+MPOL_HYBRID
+        This mode specifies that the page allocation must happen on the
+        nodes specified by the policy.  If both DRAM and non-DRAM nodes
+        are specified, NUMA balancing may promote the pages from non-DRAM
+        nodes to the specified DRAM nodes.  If only non-DRAM nodes are
+        specified, NUMA balancing may promote the pages to any available
+        DRAM nodes.  Any other policy doesn't do such page promotion.  The
+        default mode may do NUMA balancing, but non-DRAM nodes are masked
+        off for default mode.
+
 MPOL_PREFERRED
 	This mode specifies that the allocation should be attempted
 	from the single node specified in the policy.  If that