improve gem5 memory model and cpufreq experiments

userland/c/malloc_touch.c

@@ -0,0 +1,28 @@
+/* https://cirosantilli.com/linux-kernel-module-cheat#gem5-memory-latency  */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv) {
+    size_t nbytes, step;
+    if (argc > 1) {
+        nbytes = strtoull(argv[1], NULL, 0);
+    } else {
+        nbytes = 0x10;
+    }
+    if (argc > 2) {
+        step = strtoull(argv[2], NULL, 0);
+    } else {
+        step = 1;
+    }
+
+    char *base = malloc(nbytes);
+    assert(base);
+    char *i = base;
+    while (i < base + nbytes) {
+        *i = 13;
+        i += step;
+    }
+    return EXIT_SUCCESS;
+}