[PATCH] man2/set_mempolicy.2: Add mode flag MPOL_F_NUMA_BALANCING

[Alejandro Colomar <alx.manpages@gmail.com>]

From: Huang Ying <ying.huang@intel.com>

In Linux kernel 5.12, a new mode flag MPOL_F_NUMA_BALANCING is added
to set_mempolicy() to optimize the page placement among the NUMA nodes
with the NUMA balancing mechanism even if the memory of the
applications are bound with MPOL_BIND.  This patch update the man page
for the new mode flag.

Related kernel commits:
bda420b985054a3badafef23807c4b4fa38a3dff

Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Cc: "Michael Kerrisk" <mtk.manpages@gmail.com>
[ alx: srcfix ]
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
---
 man2/set_mempolicy.2 | 33 +++++++++++++++++++++++++++------
 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/man2/set_mempolicy.2 b/man2/set_mempolicy.2
index 6e695fb13..746858720 100644
--- a/man2/set_mempolicy.2
+++ b/man2/set_mempolicy.2
@@ -98,6 +98,27 @@ The supported
 .I "mode flags"
 are:
 .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 ,
+\-1 is returned and
+.I errno
+is set to
+.BR EINVAL .
+.TP
+.BR MPOL_F_RELATIVE_NODES " (since Linux 2.6.26)"
+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_STATIC_NODES " (since Linux 2.6.26)"
 A nonempty
 .I nodemask
@@ -107,12 +128,6 @@ Linux will not remap the
 when the process moves to a different cpuset context,
 nor when the set of nodes allowed by the process's
 current cpuset context changes.
-.TP
-.BR MPOL_F_RELATIVE_NODES " (since Linux 2.6.26)"
-A nonempty
-.I nodemask
-specifies node IDs that are relative to the set of
-node IDs allowed by the process's current cpuset.
 .PP
 .I nodemask
 points to a bit mask of node IDs that contains up to
@@ -293,6 +308,12 @@ 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.
-- 
2.30.1