2 files changed, 70 insertions, 0 deletions

diff --git a/SD-VBS/tools/preload b/SD-VBS/tools/preload
new file mode 100755
index 0000000..b2e70fc
--- /dev/null
+++ b/SD-VBS/tools/preload
diff --git a/SD-VBS/tools/preload.c b/SD-VBS/tools/preload.c
new file mode 100644
index 0000000..24cf428
--- /dev/null
+++ b/SD-VBS/tools/preload.c
@@ -0,0 +1,70 @@
+#include "stdio.h"
+#include "stdlib.h"
+#include "unistd.h"
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <signal.h>
+
+
+static void sig_int(int signo){
+        return;
+}
+int main(int argc, char* argv[]){
+        if(argc < 2){
+                printf("Too few arguments!\n");
+                exit(1);
+        }
+        int fd = open(argv[1], O_RDONLY);
+        if(fd < 0){
+                printf("open failure\n");
+                exit(1);
+        }
+
+        struct stat st;
+        if(fstat(fd, &st) < 0){
+                printf("stat error\n");
+                exit(1);
+        }
+        int len = st.st_size;
+        printf("size = %d\n", len);
+        void* pmap;
+        pmap = mmap(0, len, PROT_READ,MAP_SHARED | MAP_POPULATE,fd, 0);
+
+        printf("pmap = 0x%016x\n", pmap);
+        if(!pmap){
+                printf("map error\n");
+                close(fd);
+                exit(1);
+        }
+
+
+        for(int i = 0; i < len;i++){
+                char c = ((char*)pmap)[i];
+        }
+        printf("pinning pages...\n");
+        if(mlock(pmap, len) == -1){
+                printf("mlock error");
+                close(fd);
+                exit(1);
+        }
+
+        printf("done pinning...\n");
+
+
+
+        sigset_t set;
+        sigemptyset(&set);
+        sigaddset(&set,SIGINT);
+        int sig;
+        signal(SIGINT, sig_int);
+        sigwait(&set, &sig);
+        printf("unpinning pages...\n");
+
+        if(munlock(pmap, len) < 0){
+                printf("munlock error\n");
+        }
+        munmap(pmap, len);
+        close(fd);
+        return 0;
+}