Huang Ying <ying.huang@xxxxxxxxx> writes: > 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 Hi, Colomar, Do you have time to take a look at this patch? It has been reviewed in the following thread, https://lore.kernel.org/lkml/20210120061235.148637-3-ying.huang@xxxxxxxxx/ Now the corresponding kernel change has been merged by upstream kernel. Do you have further comments? Best Regards, Huang, Ying > Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx> > Cc: "Alejandro Colomar" <alx.manpages@xxxxxxxxx> > Cc: "Michael Kerrisk" <mtk.manpages@xxxxxxxxx> > --- > man2/set_mempolicy.2 | 34 ++++++++++++++++++++++++++++------ > 1 file changed, 28 insertions(+), 6 deletions(-) > > diff --git a/man2/set_mempolicy.2 b/man2/set_mempolicy.2 > index 6e695fb13..cd543667f 100644 > --- a/man2/set_mempolicy.2 > +++ b/man2/set_mempolicy.2 > @@ -98,6 +98,28 @@ 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 +129,6 @@ 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 +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.
