4 files changed, 49 insertions, 4 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 581703d86fbd..1f82adc85352 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -859,7 +859,14 @@ extern void pagefault_out_of_memory(void);
 
 #define offset_in_page(p)       ((unsigned long)(p) & ~PAGE_MASK)
 
+/*
+ * Flags passed to __show_mem() and __show_free_areas() to suppress output in
+ * various contexts.
+ */
+#define SHOW_MEM_FILTER_NODES   (0x0001u)       /* filter disallowed nodes */
+
 extern void show_free_areas(void);
+extern void __show_free_areas(unsigned int flags);
 
 int shmem_lock(struct file *file, int lock, struct user_struct *user);
 struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags);
@@ -1348,6 +1355,7 @@ extern void calculate_zone_inactive_ratio(struct zone *zone);
 extern void mem_init(void);
 extern void __init mmap_init(void);
 extern void show_mem(void);
+extern void __show_mem(unsigned int flags);
 extern void si_meminfo(struct sysinfo * val);
 extern void si_meminfo_node(struct sysinfo *val, int nid);
 extern int after_bootmem;
diff --git a/lib/show_mem.c b/lib/show_mem.c
index fdc77c82f922..d8d602b58c31 100644
--- a/lib/show_mem.c
+++ b/lib/show_mem.c
@@ -9,14 +9,14 @@
 #include <linux/nmi.h>
 #include <linux/quicklist.h>
 
-void show_mem(void)
+void __show_mem(unsigned int filter)
 {
         pg_data_t *pgdat;
         unsigned long total = 0, reserved = 0, shared = 0,
                 nonshared = 0, highmem = 0;
 
         printk("Mem-Info:\n");
-        show_free_areas();
+        __show_free_areas(filter);
 
         for_each_online_pgdat(pgdat) {
                 unsigned long i, flags;
@@ -61,3 +61,8 @@ void show_mem(void)
                 quicklist_total_size());
 #endif
 }
+
+void show_mem(void)
+{
+        __show_mem(0);
+}
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 33b58615072c..3100bc57036b 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -406,7 +406,7 @@ static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order,
         task_unlock(current);
         dump_stack();
         mem_cgroup_print_oom_info(mem, p);
-        show_mem();
+        __show_mem(SHOW_MEM_FILTER_NODES);
         if (sysctl_oom_dump_tasks)
                 dump_tasks(mem, nodemask);
 }
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7945247b1e53..36be3ba4bbed 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2411,19 +2411,42 @@ void si_meminfo_node(struct sysinfo *val, int nid)
 }
 #endif
 
+/*
+ * Determine whether the zone's node should be displayed or not, depending on
+ * whether SHOW_MEM_FILTER_NODES was passed to __show_free_areas().
+ */
+static bool skip_free_areas_zone(unsigned int flags, const struct zone *zone)
+{
+        bool ret = false;
+
+        if (!(flags & SHOW_MEM_FILTER_NODES))
+                goto out;
+
+        get_mems_allowed();
+        ret = !node_isset(zone->zone_pgdat->node_id,
+                                cpuset_current_mems_allowed);
+        put_mems_allowed();
+out:
+        return ret;
+}
+
 #define K(x) ((x) << (PAGE_SHIFT-10))
 
 /*
  * Show free area list (used inside shift_scroll-lock stuff)
  * We also calculate the percentage fragmentation. We do this by counting the
  * memory on each free list with the exception of the first item on the list.
+ * Suppresses nodes that are not allowed by current's cpuset if
+ * SHOW_MEM_FILTER_NODES is passed.
  */
-void show_free_areas(void)
+void __show_free_areas(unsigned int filter)
 {
         int cpu;
         struct zone *zone;
 
         for_each_populated_zone(zone) {
+                if (skip_free_areas_zone(filter, zone))
+                        continue;
                 show_node(zone);
                 printk("%s per-cpu:\n", zone->name);
 
@@ -2465,6 +2488,8 @@ void show_free_areas(void)
         for_each_populated_zone(zone) {
                 int i;
 
+                if (skip_free_areas_zone(filter, zone))
+                        continue;
                 show_node(zone);
                 printk("%s"
                         " free:%lukB"
@@ -2532,6 +2557,8 @@ void show_free_areas(void)
         for_each_populated_zone(zone) {
                 unsigned long nr[MAX_ORDER], flags, order, total = 0;
 
+                if (skip_free_areas_zone(filter, zone))
+                        continue;
                 show_node(zone);
                 printk("%s: ", zone->name);
 
@@ -2551,6 +2578,11 @@ void show_free_areas(void)
         show_swap_cache_info();
 }
 
+void show_free_areas(void)
+{
+        __show_free_areas(0);
+}
+
 static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref)
 {
         zoneref->zone = zone;