[PATCH v3 05/14] mm/mempolicy: refactor rebind code for PREFERRED_MANY
From: Feng Tang <hidden>
Date: 2021-03-03 15:46:13
Also in:
lkml
Subsystem:
memory management, memory management - memory policy and migration, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
From: Dave Hansen <dave.hansen@linux.intel.com> Again, this extracts the "only one node must be set" behavior of MPOL_PREFERRED. It retains virtually all of the existing code so it can be used by MPOL_PREFERRED_MANY as well. v2: Fixed typos in commit message. (Ben) Merged bits from other patches. (Ben) annotate mpol_rebind_preferred_many as unused (Ben) Link: https://lore.kernel.org/r/20200630212517.308045-6-ben.widawsky@intel.com (local) Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Ben Widawsky <redacted> Signed-off-by: Feng Tang <redacted> --- mm/mempolicy.c | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 19ec954..0103c20 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c@@ -363,14 +363,11 @@ static void mpol_rebind_nodemask(struct mempolicy *pol, const nodemask_t *nodes) pol->v.nodes = tmp; } -static void mpol_rebind_preferred(struct mempolicy *pol, - const nodemask_t *nodes) +static void mpol_rebind_preferred_common(struct mempolicy *pol, + const nodemask_t *preferred_nodes, + const nodemask_t *nodes) { nodemask_t tmp; - nodemask_t preferred_node; - - /* MPOL_PREFERRED uses only the first node in the mask */ - preferred_node = nodemask_of_node(first_node(*nodes)); if (pol->flags & MPOL_F_STATIC_NODES) { int node = first_node(pol->w.user_nodemask);
@@ -385,12 +382,30 @@ static void mpol_rebind_preferred(struct mempolicy *pol, pol->v.preferred_nodes = tmp; } else if (!(pol->flags & MPOL_F_LOCAL)) { nodes_remap(tmp, pol->v.preferred_nodes, - pol->w.cpuset_mems_allowed, preferred_node); + pol->w.cpuset_mems_allowed, *preferred_nodes); pol->v.preferred_nodes = tmp; pol->w.cpuset_mems_allowed = *nodes; } } +/* MPOL_PREFERRED_MANY allows multiple nodes to be set in 'nodes' */ +static void __maybe_unused mpol_rebind_preferred_many(struct mempolicy *pol, + const nodemask_t *nodes) +{ + mpol_rebind_preferred_common(pol, nodes, nodes); +} + +static void mpol_rebind_preferred(struct mempolicy *pol, + const nodemask_t *nodes) +{ + nodemask_t preferred_node; + + /* MPOL_PREFERRED uses only the first node in 'nodes' */ + preferred_node = nodemask_of_node(first_node(*nodes)); + + mpol_rebind_preferred_common(pol, &preferred_node, nodes); +} + /* * mpol_rebind_policy - Migrate a policy to a different set of nodes *
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2.7.4