From 79ba7c05e35b18aa2dc24da57399cfbb94a07d0e Mon Sep 17 00:00:00 2001
From: Tuowen Zhao <ztuowen@gmail.com>
Date: Wed, 4 Dec 2019 12:56:58 -0700
Subject: initial commit

---
 .gitignore     | 15 +++++++++++++++
 CMakeLists.txt |  6 ++++++
 main.cpp       | 28 ++++++++++++++++++++++++++++
 3 files changed, 49 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 CMakeLists.txt
 create mode 100644 main.cpp

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..01275f2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,15 @@
+# CLion stuff
+/.idea
+cmake-build-*
+
+# Vim stuff
+*.swp
+
+# My CMake build
+build
+
+# Test artifacts
+*.o
+*.optrpt
+*.s
+*.ll
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..58e7603
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.15)
+project(atsmmap)
+
+set(CMAKE_CXX_STANDARD 14)
+
+add_executable(atsmmap main.cpp)
\ No newline at end of file
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..43aba7f
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,28 @@
+#include <iostream>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <string>
+
+#define GIG (1024*1024*1024ul)
+#define VOLUME (2ul*GIG)
+
+// Real values is in the ~65536, only use half of it to be safe
+// sysctl vm.max_map_count
+#define MAXMMAPS 32768
+
+int main(int argc, char **argv) {
+  auto page_size = sysconf(_SC_PAGESIZE);
+  std::cout << "The system have a page size of " << page_size << std::endl;
+  auto dst = (long*)malloc(VOLUME);
+  // Src is using anonymous mapping
+  long nmaps = std::stoi(argv[1]);
+  if (GIG % (page_size * nmaps) != 0) {
+    std::cout << "nmaps is not perfect multiple" << std::endl;
+    nmaps = GIG / (page_size * nmaps);
+  }
+  std::cout << argv[1] << std::endl;
+  uint8_t *hint = (uint8_t*)0x600000000000UL;
+  mmap(hint);
+  auto src =
+  return 0;
+}
-- 
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