This QMP command allows user set guest node's memory policy
through the QMP protocol. The qmp-shell command is like:
set-mem-policy nodeid=0 policy=membind relative=true host-nodes=0-1
Signed-off-by: Wanlong Gao <gaowanl...@cn.fujitsu.com>
---
numa.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
qapi-schema.json | 21 +++++++++++++++++++
qmp-commands.hx | 41 +++++++++++++++++++++++++++++++++++++
3 files changed, 124 insertions(+)
diff --git a/numa.c b/numa.c
index 4a9c368..04b6444 100644
--- a/numa.c
+++ b/numa.c
@@ -29,6 +29,7 @@
#include "qapi/opts-visitor.h"
#include "qapi/dealloc-visitor.h"
#include "exec/memory.h"
+#include "qmp-commands.h"
#ifdef CONFIG_NUMA
#include <numa.h>
@@ -322,3 +323,64 @@ void set_numa_modes(void)
}
}
}
+
+void qmp_set_mem_policy(uint16_t nodeid, bool has_policy, NumaNodePolicy
policy,
+ bool has_relative, bool relative,
+ bool has_host_nodes, uint16List *host_nodes,
+ Error **errp)
+{
+ NumaNodePolicy old_policy;
+ bool old_relative;
+ DECLARE_BITMAP(host_mem, MAX_CPUMASK_BITS);
+ uint16List *nodes;
+
+ if (nodeid >= nb_numa_nodes) {
+ error_setg(errp, "Only has '%d' NUMA nodes", nb_numa_nodes);
+ return;
+ }
+
+ bitmap_copy(host_mem, numa_info[nodeid].host_mem, MAX_CPUMASK_BITS);
+ old_policy = numa_info[nodeid].policy;
+ old_relative = numa_info[nodeid].relative;
+
+ numa_info[nodeid].policy = NUMA_NODE_POLICY_DEFAULT;
+ numa_info[nodeid].relative = false;
+ bitmap_zero(numa_info[nodeid].host_mem, MAX_CPUMASK_BITS);
+
+ if (!has_policy) {
+ if (set_node_mem_policy(nodeid) == -1) {
+ error_setg(errp, "Failed to set memory policy for node%" PRIu16,
+ nodeid);
+ goto error;
+ }
+ return;
+ }
+
+ numa_info[nodeid].policy = policy;
+
+ if (has_relative) {
+ numa_info[nodeid].relative = relative;
+ }
+
+ if (!has_host_nodes) {
+ bitmap_fill(numa_info[nodeid].host_mem, MAX_CPUMASK_BITS);
+ }
+
+ for (nodes = host_nodes; nodes; nodes = nodes->next) {
+ bitmap_set(numa_info[nodeid].host_mem, nodes->value, 1);
+ }
+
+ if (set_node_mem_policy(nodeid) == -1) {
+ error_setg(errp, "Failed to set memory policy for node%" PRIu16,
+ nodeid);
+ goto error;
+ }
+
+ return;
+
+error:
+ bitmap_copy(numa_info[nodeid].host_mem, host_mem, MAX_CPUMASK_BITS);
+ numa_info[nodeid].policy = old_policy;
+ numa_info[nodeid].relative = old_relative;
+ return;
+}
diff --git a/qapi-schema.json b/qapi-schema.json
index 650741f..3c0bdfe 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -3847,3 +3847,24 @@
'*policy': 'NumaNodePolicy',
'*relative': 'bool',
'*host-nodes': ['uint16'] }}
+
+##
+# @set-mem-policy:
+#
+# Set the host memory binding policy for guest NUMA node.
+#
+# @nodeid: The node ID of guest NUMA node to set memory policy to.
+#
+# @policy: #optional The memory policy to be set (default 'default').
+#
+# @relative: #optional If the specified nodes are relative (default 'false')
+#
+# @host-nodes: #optional The host nodes range for memory policy.
+#
+# Returns: Nothing on success
+#
+# Since: 1.7
+##
+{ 'command': 'set-mem-policy',
+ 'data': {'nodeid': 'uint16', '*policy': 'NumaNodePolicy',
+ '*relative': 'bool', '*host-nodes': ['uint16'] } }
diff --git a/qmp-commands.hx b/qmp-commands.hx
index cf47e3f..52e6ff3 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -3061,6 +3061,7 @@ Example:
<- { "return": {} }
EQMP
+
{
.name = "query-rx-filter",
.args_type = "name:s?",
@@ -3124,3 +3125,43 @@ Example:
}
EQMP
+
+ {
+ .name = "set-mem-policy",
+ .args_type = "nodeid:i,policy:s?,relative:b?,host-nodes:q?",
+ .help = "Set the host memory binding policy for guest NUMA node",
+ .mhandler.cmd_new = qmp_marshal_input_set_mem_policy,
+ },
+
+SQMP
+set-mem-policy
+------
+
+Set the host memory binding policy for guest NUMA node
+
+Arguments:
+
+- "nodeid": The nodeid of guest NUMA node to set memory policy to.
+ (json-int)
+- "policy": The memory policy to set.
+ (json-string, optional)
+- "relative": If the specified nodes are relative.
+ (json-bool, optional)
+- "host-nodes": The host nodes contained to this memory policy.
+ (a json-array of int, optional)
+
+Example:
+
+-> { "execute": "set-mem-policy", "arguments": { "nodeid": 0,
+ "policy": "membind",
+ "relative": true,
+ "host-nodes": [0, 1] } }
+<- { "return": {} }
+
+Notes:
+ 1. If "policy" is not set, the memory policy of this "nodeid" will be set
+ to "default".
+ 2. If "host-nodes" is not set, the node mask of this "policy" will be set
+ to all available host nodes.
+
+EQMP
--
1.8.4.rc4
