linux-kernel - [PATCH 09/10] doc: add description for MPOL

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Message-Id: <1553316275-21985-10-git-send-email-yang.shi@linux.alibaba.com>
Date:   Sat, 23 Mar 2019 12:44:34 +0800
From:   Yang Shi <yang.shi@...ux.alibaba.com>
To:     mhocko@...e.com, mgorman@...hsingularity.net, riel@...riel.com,
        hannes@...xchg.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, keith.busch@...el.com,
        dan.j.williams@...el.com, fengguang.wu@...el.com, fan.du@...el.com,
        ying.huang@...el.com
Cc:     yang.shi@...ux.alibaba.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 09/10] doc: add description for MPOL_HYBRID mode

Add description for MPOL_HYBRID mode in kernel documentation.

Signed-off-by: Yang Shi <yang.shi@...ux.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