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set_mempolicy.2: Add mode flag MPOL_F_NUMA_BALANCING 

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 is bound with MPOL_BIND.  This patch updates the
man page for the new mode flag.

Related kernel commits:
bda420b985054a3badafef23807c4b4fa38a3dff

[mtk: Minor fixes to commit message]

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>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Huang Ying 2021-03-20 00:57:12 +01:00 committed by Michael Kerrisk
parent a198453571
commit 5858ad9ca8
1 changed files with 27 additions and 6 deletions
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33
man2/set_mempolicy.2
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@ -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.