mm: have zonelist contains structs with both a zone pointer and zone_idx

[sfrench/cifs-2.6.git] / mm / oom_kill.c

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 44b2da11bf43f75a3714761ab09217339579977d..e41504aa5da9efa8d5155e37097f425bdf0b193c 100644 (file)
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -37,6 +37,7 @@ static DEFINE_SPINLOCK(zone_scan_mutex);
  * badness - calculate a numeric value for how bad this task has been
  * @p: task struct of which task we should calculate
  * @uptime: current uptime in seconds
+ * @mem: target memory controller
  *
  * The formula used is relatively simple and documented inline in the
  * function. The main rationale is that we want to select a good task
@@ -174,12 +175,14 @@ static inline enum oom_constraint constrained_alloc(struct zonelist *zonelist,
                                                    gfp_t gfp_mask)
 {
 #ifdef CONFIG_NUMA
-       struct zone **z;
+       struct zone *zone;
+       struct zoneref *z;
+       enum zone_type high_zoneidx = gfp_zone(gfp_mask);
        nodemask_t nodes = node_states[N_HIGH_MEMORY];
 
-       for (z = zonelist->zones; *z; z++)
-               if (cpuset_zone_allowed_softwall(*z, gfp_mask))
-                       node_clear(zone_to_nid(*z), nodes);
+       for_each_zone_zonelist(zone, z, zonelist, high_zoneidx)
+               if (cpuset_zone_allowed_softwall(zone, gfp_mask))
+                       node_clear(zone_to_nid(zone), nodes);
                else
                        return CONSTRAINT_CPUSET;
 
@@ -264,6 +267,9 @@ static struct task_struct *select_bad_process(unsigned long *ppoints,
 }
 
 /**
+ * dump_tasks - dump current memory state of all system tasks
+ * @mem: target memory controller
+ *
  * Dumps the current memory state of all system tasks, excluding kernel threads.
  * State information includes task's pid, uid, tgid, vm size, rss, cpu, oom_adj
  * score, and name.
@@ -298,7 +304,7 @@ static void dump_tasks(const struct mem_cgroup *mem)
        } while_each_thread(g, p);
 }
 
-/**
+/*
  * Send SIGKILL to the selected  process irrespective of  CAP_SYS_RAW_IO
  * flag though it's unlikely that  we select a process with CAP_SYS_RAW_IO
  * set.
@@ -419,7 +425,7 @@ void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask)
        struct task_struct *p;
 
        cgroup_lock();
-       rcu_read_lock();
+       read_lock(&tasklist_lock);
 retry:
        p = select_bad_process(&points, mem);
        if (PTR_ERR(p) == -1UL)
@@ -432,7 +438,7 @@ retry:
                                "Memory cgroup out of memory"))
                goto retry;
 out:
-       rcu_read_unlock();
+       read_unlock(&tasklist_lock);
        cgroup_unlock();
 }
 #endif
@@ -456,29 +462,29 @@ EXPORT_SYMBOL_GPL(unregister_oom_notifier);
  * if a parallel OOM killing is already taking place that includes a zone in
  * the zonelist.  Otherwise, locks all zones in the zonelist and returns 1.
  */
-int try_set_zone_oom(struct zonelist *zonelist)
+int try_set_zone_oom(struct zonelist *zonelist, gfp_t gfp_mask)
 {
-       struct zone **z;
+       struct zoneref *z;
+       struct zone *zone;
        int ret = 1;
 
-       z = zonelist->zones;
-
        spin_lock(&zone_scan_mutex);
-       do {
-               if (zone_is_oom_locked(*z)) {
+       for_each_zone_zonelist(zone, z, zonelist, gfp_zone(gfp_mask)) {
+               if (zone_is_oom_locked(zone)) {
                        ret = 0;
                        goto out;
                }
-       } while (*(++z) != NULL);
+       }
+
+       for_each_zone_zonelist(zone, z, zonelist, gfp_zone(gfp_mask)) {
+               /*
+                * Lock each zone in the zonelist under zone_scan_mutex so a
+                * parallel invocation of try_set_zone_oom() doesn't succeed
+                * when it shouldn't.
+                */
+               zone_set_flag(zone, ZONE_OOM_LOCKED);
+       }
 
-       /*
-        * Lock each zone in the zonelist under zone_scan_mutex so a parallel
-        * invocation of try_set_zone_oom() doesn't succeed when it shouldn't.
-        */
-       z = zonelist->zones;
-       do {
-               zone_set_flag(*z, ZONE_OOM_LOCKED);
-       } while (*(++z) != NULL);
 out:
        spin_unlock(&zone_scan_mutex);
        return ret;
@@ -489,21 +495,23 @@ out:
  * allocation attempts with zonelists containing them may now recall the OOM
  * killer, if necessary.
  */
-void clear_zonelist_oom(struct zonelist *zonelist)
+void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_mask)
 {
-       struct zone **z;
-
-       z = zonelist->zones;
+       struct zoneref *z;
+       struct zone *zone;
 
        spin_lock(&zone_scan_mutex);
-       do {
-               zone_clear_flag(*z, ZONE_OOM_LOCKED);
-       } while (*(++z) != NULL);
+       for_each_zone_zonelist(zone, z, zonelist, gfp_zone(gfp_mask)) {
+               zone_clear_flag(zone, ZONE_OOM_LOCKED);
+       }
        spin_unlock(&zone_scan_mutex);
 }
 
 /**
  * out_of_memory - kill the "best" process when we run out of memory
+ * @zonelist: zonelist pointer
+ * @gfp_mask: memory allocation flags
+ * @order: amount of memory being requested as a power of 2
  *
  * If we run out of memory, we have the choice between either
  * killing a random task (bad), letting the system crash (worse)