The patch titled
Subject: mm/mempolicy.c: forbid static or relative flags for local NUMA mode
has been added to the -mm tree. Its filename is
mm-mempolicyc-forbid-static-or-relative-flags-for-local-numa-mode.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-mempolicyc-forbid-static-or-relative-flags-for-local-numa-mode.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-mempolicyc-forbid-static-or-relative-flags-for-local-numa-mode.patch
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From: Piotr Kwapulinski <kwapulinski.piotr@xxxxxxxxx>
Subject: mm/mempolicy.c: forbid static or relative flags for local NUMA mode
The MPOL_F_STATIC_NODES and MPOL_F_RELATIVE_NODES flags are irrelevant
when setting them for MPOL_LOCAL NUMA memory policy via set_mempolicy or
mbind.
Return the "invalid argument" from set_mempolicy and mbind whenever any of
these flags is passed along with MPOL_LOCAL.
It is consistent with MPOL_PREFERRED passed with empty nodemask.
It slightly shortens the execution time in paths where these flags are
used e.g. when trying to rebind the NUMA nodes for changes in cgroups
cpuset mems (mpol_rebind_preferred()) or when just printing the mempolicy
structure (/proc/PID/numa_maps). Isolated tests done.
Link: http://lkml.kernel.org/r/20161027163037.4089-1-kwapulinski.piotr@xxxxxxxxx
Signed-off-by: Piotr Kwapulinski <kwapulinski.piotr@xxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Liang Chen <liangchen.linux@xxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Nathan Zimmer <nzimmer@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempolicy.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff -puN mm/mempolicy.c~mm-mempolicyc-forbid-static-or-relative-flags-for-local-numa-mode mm/mempolicy.c
--- a/mm/mempolicy.c~mm-mempolicyc-forbid-static-or-relative-flags-for-local-numa-mode
+++ a/mm/mempolicy.c
@@ -276,7 +276,9 @@ static struct mempolicy *mpol_new(unsign
return ERR_PTR(-EINVAL);
}
} else if (mode == MPOL_LOCAL) {
- if (!nodes_empty(*nodes))
+ if (!nodes_empty(*nodes) ||
+ (flags & MPOL_F_STATIC_NODES) ||
+ (flags & MPOL_F_RELATIVE_NODES))
return ERR_PTR(-EINVAL);
mode = MPOL_PREFERRED;
} else if (nodes_empty(*nodes))
_
Patches currently in -mm which might be from kwapulinski.piotr@xxxxxxxxx are
mm-mempolicyc-forbid-static-or-relative-flags-for-local-numa-mode.patch
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