diff --git a/lmkd/lmkd.c b/lmkd/lmkd.c
index 5cfa2c8..87e674a 100644
--- a/lmkd/lmkd.c
+++ b/lmkd/lmkd.c
@@ -44,8 +44,6 @@
 #define MEMCG_SYSFS_PATH "/dev/memcg/"
 #define MEMCG_MEMORY_USAGE "/dev/memcg/memory.usage_in_bytes"
 #define MEMCG_MEMORYSW_USAGE "/dev/memcg/memory.memsw.usage_in_bytes"
-#define MEMPRESSURE_WATCH_MEDIUM_LEVEL "medium"
-#define MEMPRESSURE_WATCH_CRITICAL_LEVEL "critical"
 #define ZONEINFO_PATH "/proc/zoneinfo"
 #define LINE_MAX 128
 
@@ -72,13 +70,22 @@
 static int use_inkernel_interface = 1;
 static bool has_inkernel_module;
 
-/* memory pressure level medium event */
-static int mpevfd[2];
-#define CRITICAL_INDEX 1
-#define MEDIUM_INDEX 0
+/* memory pressure levels */
+enum vmpressure_level {
+    VMPRESS_LEVEL_LOW = 0,
+    VMPRESS_LEVEL_MEDIUM,
+    VMPRESS_LEVEL_CRITICAL,
+    VMPRESS_LEVEL_COUNT
+};
 
-static int medium_oomadj;
-static int critical_oomadj;
+static const char *level_name[] = {
+    "low",
+    "medium",
+    "critical"
+};
+
+static int level_oomadj[VMPRESS_LEVEL_COUNT];
+static int mpevfd[VMPRESS_LEVEL_COUNT];
 static bool debug_process_killing;
 static bool enable_pressure_upgrade;
 static int64_t upgrade_pressure;
@@ -90,8 +97,8 @@
 static int ctrl_dfd = -1;
 static int ctrl_dfd_reopened; /* did we reopen ctrl conn on this loop? */
 
-/* 2 memory pressure levels, 1 ctrl listen socket, 1 ctrl data socket */
-#define MAX_EPOLL_EVENTS 4
+/* 3 memory pressure levels, 1 ctrl listen socket, 1 ctrl data socket */
+#define MAX_EPOLL_EVENTS 5
 static int epollfd;
 static int maxevents;
 
@@ -226,7 +233,7 @@
     return 0;
 }
 
-static void writefilestring(char *path, char *s) {
+static void writefilestring(const char *path, char *s) {
     int fd = open(path, O_WRONLY | O_CLOEXEC);
     int len = strlen(s);
     int ret;
@@ -587,7 +594,8 @@
 }
 
 /* Kill one process specified by procp.  Returns the size of the process killed */
-static int kill_one_process(struct proc* procp, int min_score_adj, bool is_critical) {
+static int kill_one_process(struct proc* procp, int min_score_adj,
+                            enum vmpressure_level level) {
     int pid = procp->pid;
     uid_t uid = procp->uid;
     char *taskname;
@@ -606,12 +614,12 @@
         return -1;
     }
 
+    r = kill(pid, SIGKILL);
     ALOGI(
         "Killing '%s' (%d), uid %d, adj %d\n"
         "   to free %ldkB because system is under %s memory pressure oom_adj %d\n",
-        taskname, pid, uid, procp->oomadj, tasksize * page_k, is_critical ? "critical" : "medium",
-        min_score_adj);
-    r = kill(pid, SIGKILL);
+        taskname, pid, uid, procp->oomadj, tasksize * page_k,
+        level_name[level], min_score_adj);
     pid_remove(pid);
 
     if (r) {
@@ -626,10 +634,10 @@
  * Find a process to kill based on the current (possibly estimated) free memory
  * and cached memory sizes.  Returns the size of the killed processes.
  */
-static int find_and_kill_process(bool is_critical) {
+static int find_and_kill_process(enum vmpressure_level level) {
     int i;
     int killed_size = 0;
-    int min_score_adj = is_critical ? critical_oomadj : medium_oomadj;
+    int min_score_adj = level_oomadj[level];
 
     for (i = OOM_SCORE_ADJ_MAX; i >= min_score_adj; i--) {
         struct proc *procp;
@@ -638,7 +646,7 @@
         procp = proc_adj_lru(i);
 
         if (procp) {
-            killed_size = kill_one_process(procp, min_score_adj, is_critical);
+            killed_size = kill_one_process(procp, min_score_adj, level);
             if (killed_size < 0) {
                 goto retry;
             } else {
@@ -674,14 +682,23 @@
     return mem_usage;
 }
 
-static void mp_event_common(bool is_critical) {
+enum vmpressure_level upgrade_level(enum vmpressure_level level) {
+    return (enum vmpressure_level)((level < VMPRESS_LEVEL_CRITICAL) ?
+        level + 1 : level);
+}
+
+enum vmpressure_level downgrade_level(enum vmpressure_level level) {
+    return (enum vmpressure_level)((level > VMPRESS_LEVEL_LOW) ?
+        level - 1 : level);
+}
+
+static void mp_event_common(enum vmpressure_level level) {
     int ret;
     unsigned long long evcount;
-    int index = is_critical ? CRITICAL_INDEX : MEDIUM_INDEX;
     int64_t mem_usage, memsw_usage;
     int64_t mem_pressure;
 
-    ret = read(mpevfd[index], &evcount, sizeof(evcount));
+    ret = read(mpevfd[level], &evcount, sizeof(evcount));
     if (ret < 0)
         ALOGE("Error reading memory pressure event fd; errno=%d",
               errno);
@@ -689,18 +706,19 @@
     mem_usage = get_memory_usage(MEMCG_MEMORY_USAGE);
     memsw_usage = get_memory_usage(MEMCG_MEMORYSW_USAGE);
     if (memsw_usage < 0 || mem_usage < 0) {
-        find_and_kill_process(is_critical);
-        return;
+        goto do_kill;
     }
 
     // Calculate percent for swappinness.
     mem_pressure = (mem_usage * 100) / memsw_usage;
 
-    if (enable_pressure_upgrade && !is_critical) {
+    if (enable_pressure_upgrade && level != VMPRESS_LEVEL_CRITICAL) {
         // We are swapping too much.
         if (mem_pressure < upgrade_pressure) {
-            ALOGI("Event upgraded to critical.");
-            is_critical = true;
+            level = upgrade_level(level);
+            if (debug_process_killing) {
+                ALOGI("Event upgraded to %s", level_name[level]);
+            }
         }
     }
 
@@ -708,41 +726,51 @@
     // kill any process, since enough memory is available.
     if (mem_pressure > downgrade_pressure) {
         if (debug_process_killing) {
-            ALOGI("Ignore %s memory pressure", is_critical ? "critical" : "medium");
+            ALOGI("Ignore %s memory pressure", level_name[level]);
         }
         return;
-    } else if (is_critical && mem_pressure > upgrade_pressure) {
+    } else if (level == VMPRESS_LEVEL_CRITICAL &&
+               mem_pressure > upgrade_pressure) {
         if (debug_process_killing) {
             ALOGI("Downgrade critical memory pressure");
         }
-        // Downgrade event to medium, since enough memory available.
-        is_critical = false;
+        // Downgrade event, since enough memory available.
+        level = downgrade_level(level);
     }
 
-    if (find_and_kill_process(is_critical) == 0) {
+do_kill:
+    if (find_and_kill_process(level) == 0) {
         if (debug_process_killing) {
             ALOGI("Nothing to kill");
         }
     }
 }
 
-static void mp_event(uint32_t events __unused) {
-    mp_event_common(false);
+static void mp_event_low(uint32_t events __unused) {
+    mp_event_common(VMPRESS_LEVEL_LOW);
+}
+
+static void mp_event_medium(uint32_t events __unused) {
+    mp_event_common(VMPRESS_LEVEL_MEDIUM);
 }
 
 static void mp_event_critical(uint32_t events __unused) {
-    mp_event_common(true);
+    mp_event_common(VMPRESS_LEVEL_CRITICAL);
 }
 
-static int init_mp_common(char *levelstr, void *event_handler, bool is_critical)
-{
+static bool init_mp_common(void *event_handler, enum vmpressure_level level) {
     int mpfd;
     int evfd;
     int evctlfd;
     char buf[256];
     struct epoll_event epev;
     int ret;
-    int mpevfd_index = is_critical ? CRITICAL_INDEX : MEDIUM_INDEX;
+    const char *levelstr = level_name[level];
+
+    if (level_oomadj[level] > OOM_SCORE_ADJ_MAX) {
+        ALOGI("%s pressure events are disabled", levelstr);
+        return true;
+    }
 
     mpfd = open(MEMCG_SYSFS_PATH "memory.pressure_level", O_RDONLY | O_CLOEXEC);
     if (mpfd < 0) {
@@ -783,8 +811,8 @@
         goto err;
     }
     maxevents++;
-    mpevfd[mpevfd_index] = evfd;
-    return 0;
+    mpevfd[level] = evfd;
+    return true;
 
 err:
     close(evfd);
@@ -793,17 +821,7 @@
 err_open_evctlfd:
     close(mpfd);
 err_open_mpfd:
-    return -1;
-}
-
-static int init_mp_medium()
-{
-    return init_mp_common(MEMPRESSURE_WATCH_MEDIUM_LEVEL, (void *)&mp_event, false);
-}
-
-static int init_mp_critical()
-{
-    return init_mp_common(MEMPRESSURE_WATCH_CRITICAL_LEVEL, (void *)&mp_event_critical, true);
+    return false;
 }
 
 static int init(void) {
@@ -848,10 +866,13 @@
     if (use_inkernel_interface) {
         ALOGI("Using in-kernel low memory killer interface");
     } else {
-        ret = init_mp_medium();
-        ret |= init_mp_critical();
-        if (ret)
+        if (!init_mp_common((void *)&mp_event_low, VMPRESS_LEVEL_LOW) ||
+            !init_mp_common((void *)&mp_event_medium, VMPRESS_LEVEL_MEDIUM) ||
+            !init_mp_common((void *)&mp_event_critical,
+                            VMPRESS_LEVEL_CRITICAL)) {
             ALOGE("Kernel does not support memory pressure events or in-kernel low memory killer");
+            return -1;
+        }
     }
 
     for (i = 0; i <= ADJTOSLOT(OOM_SCORE_ADJ_MAX); i++) {
@@ -892,8 +913,13 @@
             .sched_priority = 1,
     };
 
-    medium_oomadj = property_get_int32("ro.lmk.medium", 800);
-    critical_oomadj = property_get_int32("ro.lmk.critical", 0);
+    /* By default disable low level vmpressure events */
+    level_oomadj[VMPRESS_LEVEL_LOW] =
+        property_get_int32("ro.lmk.low", OOM_SCORE_ADJ_MAX + 1);
+    level_oomadj[VMPRESS_LEVEL_MEDIUM] =
+        property_get_int32("ro.lmk.medium", 800);
+    level_oomadj[VMPRESS_LEVEL_CRITICAL] =
+        property_get_int32("ro.lmk.critical", 0);
     debug_process_killing = property_get_bool("ro.lmk.debug", false);
     enable_pressure_upgrade = property_get_bool("ro.lmk.critical_upgrade", false);
     upgrade_pressure = (int64_t)property_get_int32("ro.lmk.upgrade_pressure", 50);