[Qemu-devel] [PATCH 1/2] fixup! memory: move preallocation code out of exec.c

[Paolo Bonzini]

Since we need the page size for efficiency, move code to compute it
out of translate-all.c and into util/oslib-win32.c.

Signed-off-by: Paolo Bonzini <address@hidden>
---
 include/sysemu/os-win32.h |  2 ++
 translate-all.c           |  7 -------
 util/oslib-win32.c        | 19 +++++++++++++++++++
 3 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/include/sysemu/os-win32.h b/include/sysemu/os-win32.h
index bf8523a..af3fbc4 100644
--- a/include/sysemu/os-win32.h
+++ b/include/sysemu/os-win32.h
@@ -89,6 +89,8 @@ static inline void os_setup_post(void) {}
 void os_set_line_buffering(void);
 static inline void os_set_proc_name(const char *dummy) {}
 
+size_t getpagesize(void);
+
 #if !defined(EPROTONOSUPPORT)
 # define EPROTONOSUPPORT EINVAL
 #endif
diff --git a/translate-all.c b/translate-all.c
index 6b7b46e..5425d03 100644
--- a/translate-all.c
+++ b/translate-all.c
@@ -295,14 +295,7 @@ void page_size_init(void)
 {
     /* NOTE: we can always suppose that qemu_host_page_size >=
        TARGET_PAGE_SIZE */
-#ifdef _WIN32
-    SYSTEM_INFO system_info;
-
-    GetSystemInfo(&system_info);
-    qemu_real_host_page_size = system_info.dwPageSize;
-#else
     qemu_real_host_page_size = getpagesize();
-#endif
     if (qemu_host_page_size == 0) {
         qemu_host_page_size = qemu_real_host_page_size;
     }
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 69552f7..ee6bcf1 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -350,3 +350,22 @@ gint g_poll_fixed(GPollFD *fds, guint nfds, gint timeout)
 
     return num_completed;
 }
+
+size_t getpagesize(void)
+{
+    SYSTEM_INFO system_info;
+
+    GetSystemInfo(&system_info);
+    return system_info.dwPageSize;
+}
+
+void os_mem_prealloc(int fd, char *area, size_t memory)
+{
+    int i;
+    size_t pagesize = getpagesize();
+
+    memory = (memory + pagesize - 1) & -pagesize;
+    for (i = 0; i < memory / pagesize; i++) {
+        memset(area + pagesize * i, 0, 1);
+    }
+}
-- 
1.9.3