staging: android, lowmemorykiller: convert to use oom_score_adj

/proc/pid/oom_adj is deprecated and will be removed in August 2012
according to Documentation/feature-removal-schedule.txt.  Convert its
usage in the lowmemorykiller to use the new interface, oom_score_adj,
instead.

Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c
index 8b8a537..cf4c6f7 100644 (file)
--- a/drivers/staging/android/lowmemorykiller.c
+++ b/drivers/staging/android/lowmemorykiller.c
@@ -1,16 +1,17 @@
 /* drivers/misc/lowmemorykiller.c
  *
  * The lowmemorykiller driver lets user-space specify a set of memory thresholds
- * where processes with a range of oom_adj values will get killed. Specify the
- * minimum oom_adj values in /sys/module/lowmemorykiller/parameters/adj and the
- * number of free pages in /sys/module/lowmemorykiller/parameters/minfree. Both
- * files take a comma separated list of numbers in ascending order.
+ * where processes with a range of oom_score_adj values will get killed. Specify
+ * the minimum oom_score_adj values in
+ * /sys/module/lowmemorykiller/parameters/adj and the number of free pages in
+ * /sys/module/lowmemorykiller/parameters/minfree. Both files take a comma
+ * separated list of numbers in ascending order.
  *
  * For example, write "0,8" to /sys/module/lowmemorykiller/parameters/adj and
  * "1024,4096" to /sys/module/lowmemorykiller/parameters/minfree to kill
- * processes with a oom_adj value of 8 or higher when the free memory drops
- * below 4096 pages and kill processes with a oom_adj value of 0 or higher
- * when the free memory drops below 1024 pages.
+ * processes with a oom_score_adj value of 8 or higher when the free memory
+ * drops below 4096 pages and kill processes with a oom_score_adj value of 0 or
+ * higher when the free memory drops below 1024 pages.
  *
  * The driver considers memory used for caches to be free, but if a large
  * percentage of the cached memory is locked this can be very inaccurate
@@ -88,9 +89,9 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
        int rem = 0;
        int tasksize;
        int i;
-       int min_adj = OOM_ADJUST_MAX + 1;
+       int min_score_adj = OOM_SCORE_ADJ_MAX + 1;
        int selected_tasksize = 0;
-       int selected_oom_adj;
+       int selected_oom_score_adj;
        int array_size = ARRAY_SIZE(lowmem_adj);
        int other_free = global_page_state(NR_FREE_PAGES);
        int other_file = global_page_state(NR_FILE_PAGES) -
@@ -116,29 +117,29 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
        for (i = 0; i < array_size; i++) {
                if (other_free < lowmem_minfree[i] &&
                    other_file < lowmem_minfree[i]) {
-                       min_adj = lowmem_adj[i];
+                       min_score_adj = lowmem_adj[i];
                        break;
                }
        }
        if (sc->nr_to_scan > 0)
                lowmem_print(3, "lowmem_shrink %lu, %x, ofree %d %d, ma %d\n",
                                sc->nr_to_scan, sc->gfp_mask, other_free,
-                               other_file, min_adj);
+                               other_file, min_score_adj);
        rem = global_page_state(NR_ACTIVE_ANON) +
                global_page_state(NR_ACTIVE_FILE) +
                global_page_state(NR_INACTIVE_ANON) +
                global_page_state(NR_INACTIVE_FILE);
-       if (sc->nr_to_scan <= 0 || min_adj == OOM_ADJUST_MAX + 1) {
+       if (sc->nr_to_scan <= 0 || min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
                lowmem_print(5, "lowmem_shrink %lu, %x, return %d\n",
                             sc->nr_to_scan, sc->gfp_mask, rem);
                return rem;
        }
-       selected_oom_adj = min_adj;
+       selected_oom_score_adj = min_score_adj;
 
        rcu_read_lock();
        for_each_process(tsk) {
                struct task_struct *p;
-               int oom_adj;
+               int oom_score_adj;
 
                if (tsk->flags & PF_KTHREAD)
                        continue;
@@ -147,8 +148,8 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
                if (!p)
                        continue;
 
-               oom_adj = p->signal->oom_adj;
-               if (oom_adj < min_adj) {
+               oom_score_adj = p->signal->oom_score_adj;
+               if (oom_score_adj < min_score_adj) {
                        task_unlock(p);
                        continue;
                }
@@ -157,22 +158,22 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
                if (tasksize <= 0)
                        continue;
                if (selected) {
-                       if (oom_adj < selected_oom_adj)
+                       if (oom_score_adj < selected_oom_score_adj)
                                continue;
-                       if (oom_adj == selected_oom_adj &&
+                       if (oom_score_adj == selected_oom_score_adj &&
                            tasksize <= selected_tasksize)
                                continue;
                }
                selected = p;
                selected_tasksize = tasksize;
-               selected_oom_adj = oom_adj;
+               selected_oom_score_adj = oom_score_adj;
                lowmem_print(2, "select %d (%s), adj %d, size %d, to kill\n",
-                            p->pid, p->comm, oom_adj, tasksize);
+                            p->pid, p->comm, oom_score_adj, tasksize);
        }
        if (selected) {
                lowmem_print(1, "send sigkill to %d (%s), adj %d, size %d\n",
                             selected->pid, selected->comm,
-                            selected_oom_adj, selected_tasksize);
+                            selected_oom_score_adj, selected_tasksize);
                /*
                 * If CONFIG_PROFILING is off, then task_handoff_register()
                 * is a nop. In that case we don't want to stall the killer