pre-page mapped files

1 files changed, 9 insertions, 0 deletions

diff --git a/src/mapping.c b/src/mapping.c
index 45fde9a..e4ce96c 100644
--- a/src/mapping.c
+++ b/src/mapping.c
@@ -5,6 +5,8 @@
 #include <errno.h>
 #include <unistd.h>
 
+#include <stdio.h>
+
 #include "mapping.h"
 
 static int _map_file(const char* filename, void **addr, size_t *size, int writable)
@@ -26,6 +28,13 @@ static int _map_file(const char* filename, void **addr, size_t *size, int writab
                                              fd, 0);
                                 if (*addr == MAP_FAILED)
                                         error = -1;
+                else {
+                        /* tell kernel to start getting the pages */
+                        error = madvise(*addr, *size, MADV_SEQUENTIAL | MADV_WILLNEED);
+                        if (error) {
+                                perror("madvise");
+                        }
+                }
                                 close(fd);
                         } else
                                 error = fd;