diff --git a/libc/malloc_debug/Android.bp b/libc/malloc_debug/Android.bp
index 24bb18a..83e4aa8 100644
--- a/libc/malloc_debug/Android.bp
+++ b/libc/malloc_debug/Android.bp
@@ -61,6 +61,7 @@
         "DebugData.cpp",
         "debug_disable.cpp",
         "GuardData.cpp",
+        "LogAllocatorStats.cpp",
         "malloc_debug.cpp",
         "PointerData.cpp",
         "RecordData.cpp",
diff --git a/libc/malloc_debug/Config.cpp b/libc/malloc_debug/Config.cpp
index 77d2f02..89a7ce7 100644
--- a/libc/malloc_debug/Config.cpp
+++ b/libc/malloc_debug/Config.cpp
@@ -204,6 +204,10 @@
         "check_unreachable_on_signal",
         {CHECK_UNREACHABLE_ON_SIGNAL, &Config::VerifyValueEmpty},
     },
+    {
+        "log_allocator_stats_on_signal",
+        {LOG_ALLOCATOR_STATS_ON_SIGNAL, &Config::VerifyValueEmpty},
+    },
 };
 
 bool Config::ParseValue(const std::string& option, const std::string& value, size_t min_value,
@@ -467,6 +471,7 @@
   backtrace_min_size_bytes_ = 0;
   backtrace_max_size_bytes_ = SIZE_MAX;
   check_unreachable_signal_ = SIGRTMAX - 16;
+  log_allocator_stats_signal_ = SIGRTMAX - 15;
 
   // Process each option name we can find.
   std::string option;
diff --git a/libc/malloc_debug/Config.h b/libc/malloc_debug/Config.h
index ef1d2a9..754970f 100644
--- a/libc/malloc_debug/Config.h
+++ b/libc/malloc_debug/Config.h
@@ -48,6 +48,7 @@
 constexpr uint64_t VERBOSE = 0x1000;
 constexpr uint64_t CHECK_UNREACHABLE_ON_SIGNAL = 0x2000;
 constexpr uint64_t BACKTRACE_SPECIFIC_SIZES = 0x4000;
+constexpr uint64_t LOG_ALLOCATOR_STATS_ON_SIGNAL = 0x8000;
 
 // In order to guarantee posix compliance, set the minimum alignment
 // to 8 bytes for 32 bit systems and 16 bytes for 64 bit systems.
@@ -100,6 +101,8 @@
 
   int check_unreachable_signal() const { return check_unreachable_signal_; }
 
+  int log_allocator_stats_signal() const { return log_allocator_stats_signal_; }
+
  private:
   struct OptionInfo {
     uint64_t option;
@@ -175,4 +178,5 @@
   uint8_t rear_guard_value_;
 
   int check_unreachable_signal_ = 0;
+  int log_allocator_stats_signal_ = 0;
 };
diff --git a/libc/malloc_debug/DebugData.cpp b/libc/malloc_debug/DebugData.cpp
index 44c4a10..885cc95 100644
--- a/libc/malloc_debug/DebugData.cpp
+++ b/libc/malloc_debug/DebugData.cpp
@@ -31,6 +31,7 @@
 #include "Config.h"
 #include "DebugData.h"
 #include "GuardData.h"
+#include "LogAllocatorStats.h"
 #include "PointerData.h"
 #include "debug_disable.h"
 #include "malloc_debug.h"
@@ -75,6 +76,13 @@
   if (config_.options() & EXPAND_ALLOC) {
     extra_bytes_ += config_.expand_alloc_bytes();
   }
+
+  if (config_.options() & LOG_ALLOCATOR_STATS_ON_SIGNAL) {
+    if (!LogAllocatorStats::Initialize(config_)) {
+      return false;
+    }
+  }
+
   return true;
 }
 
diff --git a/libc/malloc_debug/LogAllocatorStats.cpp b/libc/malloc_debug/LogAllocatorStats.cpp
new file mode 100644
index 0000000..6d1434e
--- /dev/null
+++ b/libc/malloc_debug/LogAllocatorStats.cpp
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <errno.h>
+#include <malloc.h>
+#include <signal.h>
+#include <unistd.h>
+
+#include "Config.h"
+#include "LogAllocatorStats.h"
+#include "debug_log.h"
+
+namespace LogAllocatorStats {
+
+static std::atomic_bool g_call_mallopt = {};
+
+static void CallMalloptLogStats(int, struct siginfo*, void*) {
+  g_call_mallopt = true;
+}
+
+void CheckIfShouldLog() {
+  bool expected = true;
+  if (g_call_mallopt.compare_exchange_strong(expected, false)) {
+    info_log("Logging allocator stats...");
+    if (mallopt(M_LOG_STATS, 0) == 0) {
+      error_log("mallopt(M_LOG_STATS, 0) call failed.");
+    }
+  }
+}
+
+bool Initialize(const Config& config) {
+  struct sigaction64 log_stats_act = {};
+  log_stats_act.sa_sigaction = CallMalloptLogStats;
+  log_stats_act.sa_flags = SA_RESTART | SA_SIGINFO | SA_ONSTACK;
+  if (sigaction64(config.log_allocator_stats_signal(), &log_stats_act, nullptr) != 0) {
+    error_log("Unable to set up log allocator stats signal function: %s", strerror(errno));
+    return false;
+  }
+
+  if (config.options() & VERBOSE) {
+    info_log("%s: Run: 'kill -%d %d' to log allocator stats.", getprogname(),
+             config.log_allocator_stats_signal(), getpid());
+  }
+
+  return true;
+}
+
+}  // namespace LogAllocatorStats
diff --git a/libc/malloc_debug/LogAllocatorStats.h b/libc/malloc_debug/LogAllocatorStats.h
new file mode 100644
index 0000000..99e0738
--- /dev/null
+++ b/libc/malloc_debug/LogAllocatorStats.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#pragma once
+
+// Forward declarations
+class ConfigData;
+
+namespace LogAllocatorStats {
+
+bool Initialize(const Config& config);
+
+void CheckIfShouldLog();
+
+}  // namespace LogAllocatorStats
diff --git a/libc/malloc_debug/README.md b/libc/malloc_debug/README.md
index 37fafa7..4e39bed 100644
--- a/libc/malloc_debug/README.md
+++ b/libc/malloc_debug/README.md
@@ -340,6 +340,16 @@
     04-15 12:35:33.305  7412  7412 E malloc_debug:           #02  pc 000a9e38  /system/lib/libc++.so
     04-15 12:35:33.305  7412  7412 E malloc_debug:           #03  pc 000a28a8  /system/lib/libc++.so
 
+### log\_allocator\_stats\_on\_signal
+As of Android V, this option will trigger a call to:
+
+    mallopt(M_LOG_STATS, 0);
+
+When a process receives the signal SIGRTMAX - 15 (which is 49 on Android
+devices). The mallopt call is not async safe and is not called from the
+signal handler directly. Instead, the next time any allocation call occurs,
+the mallopt is called.
+
 ### record\_allocs[=TOTAL\_ENTRIES]
 Keep track of every allocation/free made on every thread and dump them
 to a file when the signal SIGRTMAX - 18 (which is 46 on Android devices)
diff --git a/libc/malloc_debug/malloc_debug.cpp b/libc/malloc_debug/malloc_debug.cpp
index b06ec9e..3731a5d 100644
--- a/libc/malloc_debug/malloc_debug.cpp
+++ b/libc/malloc_debug/malloc_debug.cpp
@@ -53,6 +53,7 @@
 
 #include "Config.h"
 #include "DebugData.h"
+#include "LogAllocatorStats.h"
 #include "Unreachable.h"
 #include "UnwindBacktrace.h"
 #include "backtrace.h"
@@ -517,11 +518,15 @@
 }
 
 static TimedResult InternalMalloc(size_t size) {
-  if ((g_debug->config().options() & BACKTRACE) && g_debug->pointer->ShouldDumpAndReset()) {
+  uint64_t options = g_debug->config().options();
+  if ((options & BACKTRACE) && g_debug->pointer->ShouldDumpAndReset()) {
     debug_dump_heap(android::base::StringPrintf(
                         "%s.%d.txt", g_debug->config().backtrace_dump_prefix().c_str(), getpid())
                         .c_str());
   }
+  if (options & LOG_ALLOCATOR_STATS_ON_SIGNAL) {
+    LogAllocatorStats::CheckIfShouldLog();
+  }
 
   if (size == 0) {
     size = 1;
@@ -593,11 +598,15 @@
 }
 
 static TimedResult InternalFree(void* pointer) {
-  if ((g_debug->config().options() & BACKTRACE) && g_debug->pointer->ShouldDumpAndReset()) {
+  uint64_t options = g_debug->config().options();
+  if ((options & BACKTRACE) && g_debug->pointer->ShouldDumpAndReset()) {
     debug_dump_heap(android::base::StringPrintf(
                         "%s.%d.txt", g_debug->config().backtrace_dump_prefix().c_str(), getpid())
                         .c_str());
   }
+  if (options & LOG_ALLOCATOR_STATS_ON_SIGNAL) {
+    LogAllocatorStats::CheckIfShouldLog();
+  }
 
   void* free_pointer = pointer;
   size_t bytes;
diff --git a/libc/malloc_debug/tests/malloc_debug_config_tests.cpp b/libc/malloc_debug/tests/malloc_debug_config_tests.cpp
index a911e76..84c9145 100644
--- a/libc/malloc_debug/tests/malloc_debug_config_tests.cpp
+++ b/libc/malloc_debug/tests/malloc_debug_config_tests.cpp
@@ -824,6 +824,24 @@
   ASSERT_STREQ((log_msg + usage_string).c_str(), getFakeLogPrint().c_str());
 }
 
+TEST_F(MallocDebugConfigTest, log_allocator_stats_on_signal) {
+  ASSERT_TRUE(InitConfig("log_allocator_stats_on_signal")) << getFakeLogPrint();
+  ASSERT_EQ(LOG_ALLOCATOR_STATS_ON_SIGNAL, config->options());
+
+  ASSERT_STREQ("", getFakeLogBuf().c_str());
+  ASSERT_STREQ("", getFakeLogPrint().c_str());
+}
+
+TEST_F(MallocDebugConfigTest, trigger_log_allocator_stats_on_signal_fail) {
+  ASSERT_FALSE(InitConfig("log_allocator_stats_on_signal=200")) << getFakeLogPrint();
+
+  ASSERT_STREQ("", getFakeLogBuf().c_str());
+  std::string log_msg(
+      "6 malloc_debug malloc_testing: value set for option 'log_allocator_stats_on_signal' "
+      "which does not take a value\n");
+  ASSERT_STREQ((log_msg + usage_string).c_str(), getFakeLogPrint().c_str());
+}
+
 TEST_F(MallocDebugConfigTest, size) {
   ASSERT_TRUE(InitConfig("backtrace_size=37")) << getFakeLogPrint();
   ASSERT_EQ(BACKTRACE_SPECIFIC_SIZES, config->options());
diff --git a/libc/malloc_debug/tests/malloc_debug_unit_tests.cpp b/libc/malloc_debug/tests/malloc_debug_unit_tests.cpp
index bf3ed14..334dada 100644
--- a/libc/malloc_debug/tests/malloc_debug_unit_tests.cpp
+++ b/libc/malloc_debug/tests/malloc_debug_unit_tests.cpp
@@ -267,6 +267,9 @@
         "4 malloc_debug malloc_testing: Run: 'kill -%d %d' to dump the allocation records.\n",
         SIGRTMAX - 18, getpid());
     expected_log += android::base::StringPrintf(
+        "4 malloc_debug malloc_testing: Run: 'kill -%d %d' to log allocator stats.\n",
+        SIGRTMAX - 15, getpid());
+    expected_log += android::base::StringPrintf(
         "4 malloc_debug malloc_testing: Run: 'kill -%d %d' to check for unreachable memory.\n",
         SIGRTMAX - 16, getpid());
   }
@@ -348,6 +351,16 @@
   ASSERT_STREQ(expected_log.c_str(), getFakeLogPrint().c_str());
 }
 
+TEST_F(MallocDebugTest, verbose_log_allocator_stats_on_signal) {
+  Init("verbose log_allocator_stats_on_signal");
+
+  std::string expected_log = android::base::StringPrintf(
+      "4 malloc_debug malloc_testing: Run: 'kill -%d %d' to log allocator stats.\n", SIGRTMAX - 15,
+      getpid());
+  expected_log += "4 malloc_debug malloc_testing: malloc debug enabled\n";
+  ASSERT_STREQ(expected_log.c_str(), getFakeLogPrint().c_str());
+}
+
 TEST_F(MallocDebugTest, fill_on_free) {
   Init("fill_on_free free_track free_track_backtrace_num_frames=0");
 
@@ -411,7 +424,8 @@
 TEST_F(MallocDebugTest, all_options) {
   Init(
       "guard backtrace backtrace_enable_on_signal fill expand_alloc free_track leak_track "
-      "record_allocs verify_pointers abort_on_error verbose check_unreachable_on_signal");
+      "record_allocs verify_pointers abort_on_error verbose check_unreachable_on_signal "
+      "log_allocator_stats_on_signal");
   VerifyAllocCalls(true);
 }
 
@@ -2781,6 +2795,27 @@
       getFakeLogPrint().c_str());
 }
 
+TEST_F(MallocDebugTest, log_allocator_stats_on_signal) {
+  Init("log_allocator_stats_on_signal");
+
+  ASSERT_TRUE(kill(getpid(), SIGRTMAX - 15) == 0);
+  sleep(1);
+
+  // The first unreachable check will pass.
+  void* pointer = debug_malloc(110);
+  ASSERT_TRUE(pointer != nullptr);
+  debug_free(pointer);
+
+  ASSERT_STREQ("", getFakeLogBuf().c_str());
+  if (!running_with_hwasan()) {
+    // Do an exact match because the mallopt should not fail in normal operation.
+    ASSERT_STREQ("4 malloc_debug Logging allocator stats...\n", getFakeLogPrint().c_str());
+  } else {
+    // mallopt fails with hwasan, so just verify that the message is present.
+    ASSERT_MATCH(getFakeLogPrint(), "4 malloc_debug Logging allocator stats...\\n");
+  }
+}
+
 TEST_F(MallocDebugTest, backtrace_only_some_sizes_with_backtrace_size) {
   Init("leak_track backtrace backtrace_size=120");