linux-kernel - [PATCH 1/1] mm/mempolicy.c: add MPOL_LOCAL NUMA memory policy documentation

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Message-Id: <20160927132254.12050-1-kwapulinski.piotr@gmail.com>
Date:   Tue, 27 Sep 2016 15:22:54 +0200
From:   Piotr Kwapulinski <kwapulinski.piotr@...il.com>
To:     akpm@...ux-foundation.org
Cc:     kirill.shutemov@...ux.intel.com, vbabka@...e.cz,
        rientjes@...gle.com, mhocko@...nel.org,
        mgorman@...hsingularity.net, liangchen.linux@...il.com,
        nzimmer@....com, a.p.zijlstra@...llo.nl, cl@...ux.com,
        riel@...hat.com, lee.schermerhorn@...com, jmarchan@...hat.com,
        joe@...ches.com, corbet@....net, iamyooon@...il.com,
        n-horiguchi@...jp.nec.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-man@...r.kernel.org,
        mtk.manpages@...il.com, linux-doc@...r.kernel.org,
        linux-api@...r.kernel.org, kwapulinski.piotr@...il.com
Subject: [PATCH 1/1] mm/mempolicy.c: add MPOL_LOCAL NUMA memory policy documentation

The MPOL_LOCAL mode has been implemented by
Peter Zijlstra <a.p.zijlstra@...llo.nl>
(commit: 479e2802d09f1e18a97262c4c6f8f17ae5884bd8).
Add the documentation for this mode.

Signed-off-by: Piotr Kwapulinski <kwapulinski.piotr@...il.com>
---
 Documentation/vm/numa_memory_policy.txt | 8 ++++++++
 mm/mempolicy.c                          | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/Documentation/vm/numa_memory_policy.txt b/Documentation/vm/numa_memory_policy.txt
index 622b927..dcb490e 100644
--- a/Documentation/vm/numa_memory_policy.txt
+++ b/Documentation/vm/numa_memory_policy.txt
@@ -212,6 +212,14 @@ Components of Memory Policies
 	    the temporary interleaved system default policy works in this
 	    mode.
 
+	MPOL_LOCAL: This mode specifies "local allocation". It must be
+	used along with an empty nodemask. It acts like the MPOL_PREFERRED
+	mode specified with an empty nodemask. For details refer to
+	the MPOL_PREFERRED mode described above.
+
+	    Internally, it is transformed into MPOL_PREFERRED mode with an
+	    empty nodemask.
+
    Linux memory policy supports the following optional mode flags:
 
 	MPOL_F_STATIC_NODES:  This flag specifies that the nodemask passed by
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 2da72a5..02dc43e 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -35,6 +35,10 @@
  *                use the process policy. This is what Linux always did
  *		  in a NUMA aware kernel and still does by, ahem, default.
  *
+ * local          "Local allocation". It acts like a special case of
+ *                "preferred" memory policy: NUMA_NO_NODE (see above
+ *                for details).
+ *
  * The process policy is applied for most non interrupt memory allocations
  * in that process' context. Interrupts ignore the policies and always
  * try to allocate on the local CPU. The VMA policy is only applied for memory
-- 
2.10.0