3 files changed, 33 insertions, 1 deletions
diff --git a/libc/malloc_debug/DebugData.h b/libc/malloc_debug/DebugData.h
index 13bba48df..e81bf404e 100644
--- a/libc/malloc_debug/DebugData.h
+++ b/libc/malloc_debug/DebugData.h
@@ -98,3 +98,9 @@ class DebugData {
 };
 
 extern DebugData* g_debug;
+
+// The minimum and maximum allocation sizes
+// for which backtrace will be recorded.
+// They default to 0 and SIZE_MAX respectively
+extern size_t g_min_alloc_to_record;
+extern size_t g_max_alloc_to_record;
diff --git a/libc/malloc_debug/PointerData.cpp b/libc/malloc_debug/PointerData.cpp
index 90c913638..4c5559bb9 100644
--- a/libc/malloc_debug/PointerData.cpp
+++ b/libc/malloc_debug/PointerData.cpp
@@ -197,7 +197,10 @@ void PointerData::Add(const void* ptr, size_t pointer_size) {
   uintptr_t pointer = reinterpret_cast<uintptr_t>(ptr);
   size_t hash_index = 0;
   if (backtrace_enabled_) {
-    hash_index = AddBacktrace(g_debug->config().backtrace_frames());
+    if ((pointer_size >= g_min_alloc_to_record) &&
+        (pointer_size <= g_max_alloc_to_record)) {
+      hash_index = AddBacktrace(g_debug->config().backtrace_frames());
+    }
   }
 
   std::lock_guard<std::mutex> pointer_guard(pointer_mutex_);
diff --git a/libc/malloc_debug/malloc_debug.cpp b/libc/malloc_debug/malloc_debug.cpp
index d23ab15c3..e435f8efb 100644
--- a/libc/malloc_debug/malloc_debug.cpp
+++ b/libc/malloc_debug/malloc_debug.cpp
@@ -39,6 +39,8 @@
 #include <sys/syscall.h>
 #include <unistd.h>
 
+#include <sys/system_properties.h>
+
 #include <mutex>
 #include <vector>
 
@@ -66,6 +68,10 @@ DebugData* g_debug;
 bool* g_zygote_child;
 
 const MallocDispatch* g_dispatch;
+
+size_t g_min_alloc_to_record = 0;
+size_t g_max_alloc_to_record = SIZE_MAX;
+
 // ------------------------------------------------------------------------
 
 // ------------------------------------------------------------------------
@@ -325,6 +331,23 @@ bool debug_initialize(const MallocDispatch* malloc_dispatch, bool* zygote_child,
   // of different error cases.
   backtrace_startup();
 
+  char min_alloc_to_record[10];
+  if (__system_property_get("libc.debug.malloc.minalloctorecord", min_alloc_to_record)) {
+    g_min_alloc_to_record = atoi(min_alloc_to_record);
+  }
+
+  char max_alloc_to_record[10];
+  if (__system_property_get("libc.debug.malloc.maxalloctorecord", max_alloc_to_record)) {
+    g_max_alloc_to_record = atoi(max_alloc_to_record);
+  }
+
+  if (g_min_alloc_to_record > g_max_alloc_to_record) {
+    error_log("%s: min_alloc_to_record > max_alloc_to_record!,"
+        "reverting back to default limits", getprogname());
+    g_min_alloc_to_record = 0;
+    g_max_alloc_to_record = SIZE_MAX;
+  }
+
   if (g_debug->config().options() & VERBOSE) {
     info_log("%s: malloc debug enabled", getprogname());
   }