Reduce oom_score_adj to zero for perfprofd.

Up until this point perfprofd has inherited a
decreased OOM score of -1000 from init -- this
doens't make sense given that perfprofd is not
a critical system service. This fixes perfprofd to
reduce its oom_score_adj to 0.

Bug: 25216630
Change-Id: Ica8a300d8c33016bcbd3b0ecd25393828654878e

1 files changed, 9 insertions, 0 deletions

diff --git a/perfprofd/perfprofdcore.cc b/perfprofd/perfprofdcore.cc
index 3fb532c1..d9ed2b03 100644
--- a/perfprofd/perfprofdcore.cc
+++ b/perfprofd/perfprofdcore.cc
@@ -828,6 +828,15 @@ static void init(ConfigReader &config)
             config.getConfigFilePath());
   }
 
+  // Children of init inherit an artificially low OOM score -- this is not
+  // desirable for perfprofd (its OOM score should be on par with
+  // other user processes).
+  std::stringstream oomscore_path;
+  oomscore_path << "/proc/" << getpid() << "/oom_score_adj";
+  if (!android::base::WriteStringToFile("0", oomscore_path.str())) {
+    W_ALOGE("unable to write to %s", oomscore_path.str().c_str());
+  }
+
   set_seed(config);
   cleanup_destination_dir(config);