From 0ee935dd7218449594e25f2fda9d7e3a74ae84ed Mon Sep 17 00:00:00 2001
From: Michael Vines <mvines@gmail.com>
Date: Tue, 7 Aug 2018 10:23:38 -0700
Subject: [PATCH] Adjust fullnode/drone oom_score_adj to goad the kernel into
 killing it first

---
 multinode-demo/common.sh    | 15 +++++++++++++++
 multinode-demo/drone.sh     |  1 +
 multinode-demo/leader.sh    |  1 +
 multinode-demo/validator.sh |  1 +
 4 files changed, 18 insertions(+)

diff --git a/multinode-demo/common.sh b/multinode-demo/common.sh
index f93a2600a..b636c2c01 100644
--- a/multinode-demo/common.sh
+++ b/multinode-demo/common.sh
@@ -173,6 +173,21 @@ tune_networking() {
   fi
 }
 
+oom_score_adj() {
+  declare pid=$1
+  declare score=$2
+  if [[ $(uname) != Linux ]]; then
+    return
+  fi
+
+  (
+    echo "$score" > "/proc/$pid/oom_score_adj"
+    if [[ $score != $(cat "/proc/$pid/oom_score_adj") ]]; then
+      echo "Failed to set oom_score_adj for pid $pid"
+    fi
+  )
+}
+
 SOLANA_CONFIG_DIR=${SNAP_DATA:-$PWD}/config
 SOLANA_CONFIG_PRIVATE_DIR=${SNAP_DATA:-$PWD}/config-private
 SOLANA_CONFIG_VALIDATOR_DIR=${SNAP_DATA:-$PWD}/config-validator
diff --git a/multinode-demo/drone.sh b/multinode-demo/drone.sh
index 3d811aee3..1bee18dcf 100755
--- a/multinode-demo/drone.sh
+++ b/multinode-demo/drone.sh
@@ -42,4 +42,5 @@ $solana_drone \
   -l "$SOLANA_CONFIG_DIR"/leader.json -k "$SOLANA_CONFIG_PRIVATE_DIR"/mint.json \
   > >($drone_logger) 2>&1 &
 pid=$!
+oom_score_adj "$pid" 1000
 wait "$pid"
diff --git a/multinode-demo/leader.sh b/multinode-demo/leader.sh
index b0b031e1f..692318d8e 100755
--- a/multinode-demo/leader.sh
+++ b/multinode-demo/leader.sh
@@ -31,4 +31,5 @@ $program \
   --ledger "$SOLANA_CONFIG_DIR"/ledger \
   > >($leader_logger) 2>&1 &
 pid=$!
+oom_score_adj "$pid" 1000
 wait "$pid"
diff --git a/multinode-demo/validator.sh b/multinode-demo/validator.sh
index 4ef18f62d..c6215463e 100755
--- a/multinode-demo/validator.sh
+++ b/multinode-demo/validator.sh
@@ -108,4 +108,5 @@ $program \
   --ledger "$SOLANA_LEADER_CONFIG_DIR"/ledger \
   > >($validator_logger) 2>&1 &
 pid=$!
+oom_score_adj "$pid" 1000
 wait "$pid"