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From:   Yang Shi <yang.shi@linux.alibaba.com>
To:     mhocko@suse.com, mgorman@techsingularity.net, riel@surriel.com,
        hannes@cmpxchg.org, akpm@linux-foundation.org,
        dave.hansen@intel.com, keith.busch@intel.com,
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Cc:     yang.shi@linux.alibaba.com, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH 09/10] doc: add description for MPOL_HYBRID mode
Date:   Sat, 23 Mar 2019 12:44:34 +0800
Message-Id: <1553316275-21985-10-git-send-email-yang.shi@linux.alibaba.com>
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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 --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
-- 
1.8.3.1