[Qemu-devel] [PATCH V2 9/9] NUMA: show host memory policy info in info numa command

[Wanlong Gao <gaowanlong@cn.fujitsu.com>]

Show host memory policy of nodes in the info numa monitor command.
After this patch, the monitor command "info numa" will show the
information like following if the host numa support is enabled:

    (qemu) info numa
    2 nodes
    node 0 cpus: 0
    node 0 size: 1024 MB
    node 0 mempolicy: membind=0,1
    node 1 cpus: 1
    node 1 size: 1024 MB
    node 1 mempolicy: interleave=1

Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
---
 monitor.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/monitor.c b/monitor.c
index 61dbebb..b6e93e5 100644
--- a/monitor.c
+++ b/monitor.c
@@ -74,6 +74,11 @@
 #endif
 #include "hw/lm32/lm32_pic.h"
 
+#ifdef CONFIG_NUMA
+#include <numa.h>
+#include <numaif.h>
+#endif
+
 //#define DEBUG
 //#define DEBUG_COMPLETION
 
@@ -1807,6 +1812,7 @@ static void do_info_numa(Monitor *mon, const QDict *qdict)
     int i;
     CPUArchState *env;
     CPUState *cpu;
+    unsigned long first, next;
 
     monitor_printf(mon, "%d nodes\n", nb_numa_nodes);
     for (i = 0; i < nb_numa_nodes; i++) {
@@ -1820,6 +1826,42 @@ static void do_info_numa(Monitor *mon, const QDict *qdict)
         monitor_printf(mon, "\n");
         monitor_printf(mon, "node %d size: %" PRId64 " MB\n", i,
             numa_info[i].node_mem >> 20);
+
+#ifdef CONFIG_NUMA
+        monitor_printf(mon, "node %d mempolicy: ", i);
+        switch (numa_info[i].flags & NODE_HOST_POLICY_MASK) {
+        case NODE_HOST_BIND:
+            monitor_printf(mon, "membind=");
+            break;
+        case NODE_HOST_INTERLEAVE:
+            monitor_printf(mon, "interleave=");
+            break;
+        case NODE_HOST_PREFERRED:
+            monitor_printf(mon, "preferred=");
+            break;
+        default:
+            monitor_printf(mon, "default\n");
+            continue;
+        }
+
+        if (numa_info[i].flags & NODE_HOST_RELATIVE)
+            monitor_printf(mon, "+");
+
+        next = first = find_first_bit(numa_info[i].host_mem, MAX_CPUMASK_BITS);
+        monitor_printf(mon, "%lu", first);
+        do {
+            if (next == numa_max_node())
+                break;
+            next = find_next_bit(numa_info[i].host_mem, MAX_CPUMASK_BITS,
+                                 next + 1);
+            if (next > numa_max_node() || next == MAX_CPUMASK_BITS)
+                break;
+
+            monitor_printf(mon, ",%lu", next);
+        } while (true);
+
+        monitor_printf(mon, "\n");
+#endif
     }
 }
 
-- 
1.8.3.1.448.gfb7dfaa