diff --git a/libbacktrace/UnwindStack.cpp b/libbacktrace/UnwindStack.cpp
index 3b2f38e..61812ab 100644
--- a/libbacktrace/UnwindStack.cpp
+++ b/libbacktrace/UnwindStack.cpp
@@ -41,8 +41,7 @@
 #include "UnwindStack.h"
 #include "UnwindStackMap.h"
 
-static std::string GetFunctionName(pid_t pid, BacktraceMap* back_map, uintptr_t pc,
-                                   uintptr_t* offset) {
+static std::string GetFunctionName(BacktraceMap* back_map, uintptr_t pc, uintptr_t* offset) {
   *offset = 0;
   unwindstack::Maps* maps = reinterpret_cast<UnwindStackMap*>(back_map)->stack_maps();
 
@@ -52,7 +51,8 @@
     return "";
   }
 
-  unwindstack::Elf* elf = map_info->GetElf(pid, true);
+  UnwindStackMap* stack_map = reinterpret_cast<UnwindStackMap*>(back_map);
+  unwindstack::Elf* elf = map_info->GetElf(stack_map->process_memory(), true);
 
   std::string name;
   uint64_t func_offset;
@@ -68,10 +68,10 @@
   return library == "libunwindstack.so" || library == "libbacktrace.so";
 }
 
-static bool Unwind(pid_t pid, unwindstack::Memory* memory, unwindstack::Regs* regs,
-                   BacktraceMap* back_map, std::vector<backtrace_frame_data_t>* frames,
-                   size_t num_ignore_frames) {
-  unwindstack::Maps* maps = reinterpret_cast<UnwindStackMap*>(back_map)->stack_maps();
+static bool Unwind(unwindstack::Regs* regs, BacktraceMap* back_map,
+                   std::vector<backtrace_frame_data_t>* frames, size_t num_ignore_frames) {
+  UnwindStackMap* stack_map = reinterpret_cast<UnwindStackMap*>(back_map);
+  unwindstack::Maps* maps = stack_map->stack_maps();
   bool adjust_rel_pc = false;
   size_t num_frames = 0;
   frames->clear();
@@ -84,7 +84,7 @@
       break;
     }
 
-    unwindstack::Elf* elf = map_info->GetElf(pid, true);
+    unwindstack::Elf* elf = map_info->GetElf(stack_map->process_memory(), true);
     uint64_t rel_pc = elf->GetRelPc(regs->pc(), map_info);
 
     bool skip_frame = num_frames == 0 && IsUnwindLibrary(map_info->name);
@@ -137,7 +137,7 @@
       break;
     }
 
-    if (!elf->Step(rel_pc + map_info->elf_offset, regs, memory)) {
+    if (!elf->Step(rel_pc + map_info->elf_offset, regs, stack_map->process_memory().get())) {
       break;
     }
   }
@@ -146,10 +146,10 @@
 }
 
 UnwindStackCurrent::UnwindStackCurrent(pid_t pid, pid_t tid, BacktraceMap* map)
-    : BacktraceCurrent(pid, tid, map), memory_(new unwindstack::MemoryLocal) {}
+    : BacktraceCurrent(pid, tid, map) {}
 
 std::string UnwindStackCurrent::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
-  return ::GetFunctionName(Pid(), GetMap(), pc, offset);
+  return ::GetFunctionName(GetMap(), pc, offset);
 }
 
 bool UnwindStackCurrent::UnwindFromContext(size_t num_ignore_frames, ucontext_t* ucontext) {
@@ -165,14 +165,14 @@
   }
 
   error_ = BACKTRACE_UNWIND_NO_ERROR;
-  return ::Unwind(getpid(), memory_.get(), regs.get(), GetMap(), &frames_, num_ignore_frames);
+  return ::Unwind(regs.get(), GetMap(), &frames_, num_ignore_frames);
 }
 
 UnwindStackPtrace::UnwindStackPtrace(pid_t pid, pid_t tid, BacktraceMap* map)
-    : BacktracePtrace(pid, tid, map), memory_(new unwindstack::MemoryRemote(pid)) {}
+    : BacktracePtrace(pid, tid, map) {}
 
 std::string UnwindStackPtrace::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
-  return ::GetFunctionName(Pid(), GetMap(), pc, offset);
+  return ::GetFunctionName(GetMap(), pc, offset);
 }
 
 bool UnwindStackPtrace::Unwind(size_t num_ignore_frames, ucontext_t* context) {
@@ -185,7 +185,7 @@
   }
 
   error_ = BACKTRACE_UNWIND_NO_ERROR;
-  return ::Unwind(Pid(), memory_.get(), regs.get(), GetMap(), &frames_, num_ignore_frames);
+  return ::Unwind(regs.get(), GetMap(), &frames_, num_ignore_frames);
 }
 
 Backtrace* Backtrace::CreateNew(pid_t pid, pid_t tid, BacktraceMap* map) {
diff --git a/libbacktrace/UnwindStack.h b/libbacktrace/UnwindStack.h
index 32d1f51..be9ef63 100644
--- a/libbacktrace/UnwindStack.h
+++ b/libbacktrace/UnwindStack.h
@@ -35,9 +35,6 @@
   std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) override;
 
   bool UnwindFromContext(size_t num_ignore_frames, ucontext_t* ucontext) override;
-
- private:
-  std::unique_ptr<unwindstack::Memory> memory_;
 };
 
 class UnwindStackPtrace : public BacktracePtrace {
@@ -48,9 +45,6 @@
   bool Unwind(size_t num_ignore_frames, ucontext_t* context) override;
 
   std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset);
-
- private:
-  std::unique_ptr<unwindstack::Memory> memory_;
 };
 
 #endif  // _LIBBACKTRACE_UNWIND_STACK_H
diff --git a/libbacktrace/UnwindStackMap.cpp b/libbacktrace/UnwindStackMap.cpp
index ba9fd87..d4a2444 100644
--- a/libbacktrace/UnwindStackMap.cpp
+++ b/libbacktrace/UnwindStackMap.cpp
@@ -36,6 +36,9 @@
     stack_maps_.reset(new unwindstack::RemoteMaps(pid_));
   }
 
+  // Create the process memory object.
+  process_memory_ = unwindstack::Memory::CreateProcessMemory(pid_);
+
   if (!stack_maps_->Parse()) {
     return false;
   }
@@ -68,7 +71,7 @@
   if (map_info == nullptr) {
     return;
   }
-  unwindstack::Elf* elf = map_info->GetElf(pid_, true);
+  unwindstack::Elf* elf = map_info->GetElf(process_memory_, true);
   map->load_bias = elf->GetLoadBias();
 }
 
diff --git a/libbacktrace/UnwindStackMap.h b/libbacktrace/UnwindStackMap.h
index 7885b74..b93b340 100644
--- a/libbacktrace/UnwindStackMap.h
+++ b/libbacktrace/UnwindStackMap.h
@@ -20,6 +20,8 @@
 #include <stdint.h>
 #include <sys/types.h>
 
+#include <memory>
+
 #include <backtrace/BacktraceMap.h>
 #include <unwindstack/Maps.h>
 
@@ -34,8 +36,11 @@
 
   unwindstack::Maps* stack_maps() { return stack_maps_.get(); }
 
+  const std::shared_ptr<unwindstack::Memory>& process_memory() { return process_memory_; }
+
  protected:
   std::unique_ptr<unwindstack::Maps> stack_maps_;
+  std::shared_ptr<unwindstack::Memory> process_memory_;
 };
 
 #endif  // _LIBBACKTRACE_UNWINDSTACK_MAP_H