linux-kernel - [PATCH -V8 2/3] NOT kernel/man2/set_mempolicy.2: Add mode flag MPOL_F_NUMA

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Message-Id: <20210106065754.17955-3-ying.huang@intel.com>
Date:   Wed,  6 Jan 2021 14:57:53 +0800
From:   Huang Ying <ying.huang@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>, Mel Gorman <mgorman@...e.de>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Huang Ying <ying.huang@...el.com>,
        "Alejandro Colomar" <alx.mailinglists@...il.com>
Subject: [PATCH -V8 2/3] NOT kernel/man2/set_mempolicy.2: Add mode flag MPOL_F_NUMA_BALANCING

Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
Cc: "Alejandro Colomar" <alx.mailinglists@...il.com>
---
 man2/set_mempolicy.2 | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/man2/set_mempolicy.2 b/man2/set_mempolicy.2
index 68011eecb..fa64a1820 100644
--- a/man2/set_mempolicy.2
+++ b/man2/set_mempolicy.2
@@ -113,6 +113,22 @@ A nonempty
 .I nodemask
 specifies node IDs that are relative to the set of
 node IDs allowed by the process's current cpuset.
+.TP
+.BR MPOL_F_NUMA_BALANCING " (since Linux 5.12)"
+When
+.I mode
+is
+.BR MPOL_BIND ,
+enable the kernel NUMA balancing for the task if it is supported by
+the kernel.
+If the flag isn't supported by the kernel, or is used with
+.I mode
+other than
+.BR MPOL_BIND ,
+return \-1 and
+.I errno
+is set to
+.BR EINVAL .
 .PP
 .I nodemask
 points to a bit mask of node IDs that contains up to
@@ -293,6 +309,12 @@ argument specified both
 .B MPOL_F_STATIC_NODES
 and
 .BR MPOL_F_RELATIVE_NODES .
+Or, the
+.B MPOL_F_NUMA_BALANCING
+isn't supported by the kernel, or is used with
+.I mode
+other than
+.BR MPOL_BIND .
 .TP
 .B ENOMEM
 Insufficient kernel memory was available.
-- 
2.29.2