From: Xiao Guangrong <xiaoguangr...@tencent.com>
It will be used by the compression threads
Reviewed-by: Peter Xu <pet...@redhat.com>
Signed-off-by: Xiao Guangrong <xiaoguangr...@tencent.com>
---
migration/ram.c | 40 ++++++++++++++++++++++++++++++----------
1 file changed, 30 insertions(+), 10 deletions(-)
diff --git a/migration/ram.c b/migration/ram.c
index d631b9a6fe..49ace30614 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1667,27 +1667,47 @@ static void migration_bitmap_sync(RAMState *rs)
/**
* save_zero_page: send the zero page to the stream
*
- * Returns the number of pages written.
+ * Returns the size of data written to the file, 0 means the page is not
+ * a zero page
*
* @rs: current RAM state
+ * @file: the file where the data is saved
* @block: block that contains the page we want to send
* @offset: offset inside the block for the page
*/
-static int save_zero_page(RAMState *rs, RAMBlock *block, ram_addr_t offset)
+static int save_zero_page_to_file(RAMState *rs, QEMUFile *file,
+ RAMBlock *block, ram_addr_t offset)
{
uint8_t *p = block->host + offset;
- int pages = -1;
+ int len = 0;
if (is_zero_range(p, TARGET_PAGE_SIZE)) {
- ram_counters.duplicate++;
- ram_counters.transferred +=
- save_page_header(rs, rs->f, block, offset | RAM_SAVE_FLAG_ZERO);
- qemu_put_byte(rs->f, 0);
- ram_counters.transferred += 1;
- pages = 1;
+ len += save_page_header(rs, file, block, offset | RAM_SAVE_FLAG_ZERO);
+ qemu_put_byte(file, 0);
+ len += 1;
}
+ return len;
+}
- return pages;
+/**
+ * save_zero_page: send the zero page to the stream
+ *
+ * Returns the number of pages written.
+ *
+ * @rs: current RAM state
+ * @block: block that contains the page we want to send
+ * @offset: offset inside the block for the page
+ */
+static int save_zero_page(RAMState *rs, RAMBlock *block, ram_addr_t offset)
+{
+ int len = save_zero_page_to_file(rs, rs->f, block, offset);
+
+ if (len) {
+ ram_counters.duplicate++;
+ ram_counters.transferred += len;
+ return 1;
+ }
+ return -1;
}
static void ram_release_pages(const char *rbname, uint64_t offset, int pages)
--
2.14.4
