commit 16b6099476078feb6da54ef4789f2a0ff569b6db
author Todd Poynor <toddpoynor@google.com> Mon Sep 16 19:26:47 2013 -0700
committer Todd Poynor <toddpoynor@google.com> Mon Sep 23 18:32:02 2013 +0000
tree e07b2666952eb57a654f8082ac5c885353c81855
parent cae02657be05e7f016cb261fc9fffdc96dd1b9cd

low memory killer: switch to kernel oom_score_adj interface

Use oom_score_adj for setting OOM score adjustment values instead
of the older, deprecated oom_adj interface.

Change-Id: I5ba7801d4b8971be092b31ae0fd8af8c3001d613

lmkd/lmkd.c

diff --git a/lmkd/lmkd.c b/lmkd/lmkd.c
index 376410b..e489e81 100644
--- a/lmkd/lmkd.c
+++ b/lmkd/lmkd.c
@@ -75,6 +75,10 @@
 #define OOM_ADJUST_MIN (-16)
 #define OOM_ADJUST_MAX 15
 
+/* kernel OOM score values */
+#define OOM_SCORE_ADJ_MIN       (-1000)
+#define OOM_SCORE_ADJ_MAX       1000
+
 static int lowmem_adj[MAX_TARGETS];
 static int lowmem_minfree[MAX_TARGETS];
 static int lowmem_targets_size;
@@ -116,6 +120,14 @@
 /* PAGE_SIZE / 1024 */
 static long page_k;
 
+static int lowmem_oom_adj_to_oom_score_adj(int oom_adj)
+{
+    if (oom_adj == OOM_ADJUST_MAX)
+        return OOM_SCORE_ADJ_MAX;
+    else
+        return (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE;
+}
+
 static struct proc *pid_lookup(int pid) {
     struct proc *procp;
 
@@ -219,8 +231,8 @@
         return;
     }
 
-    snprintf(path, sizeof(path), "/proc/%d/oom_adj", pid);
-    snprintf(val, sizeof(val), "%d", oomadj);
+    snprintf(path, sizeof(path), "/proc/%d/oom_score_adj", pid);
+    snprintf(val, sizeof(val), "%d", lowmem_oom_adj_to_oom_score_adj(oomadj));
     writefilestring(path, val);
 
     if (use_inkernel_interface)