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-rw-r--r--arch_init.c44
1 files changed, 25 insertions, 19 deletions
diff --git a/arch_init.c b/arch_init.c
index 990c88ea7d..d30fd137a5 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -353,11 +353,27 @@ static void xbzrle_cache_zero_page(ram_addr_t current_addr)
#define ENCODING_FLAG_XBZRLE 0x1
+/**
+ * save_xbzrle_page: compress and send current page
+ *
+ * Returns: 1 means that we wrote the page
+ * 0 means that page is identical to the one already sent
+ * -1 means that xbzrle would be longer than normal
+ *
+ * @f: QEMUFile where to send the data
+ * @current_data:
+ * @current_addr:
+ * @block: block that contains the page we want to send
+ * @offset: offset inside the block for the page
+ * @last_stage: if we are at the completion stage
+ * @bytes_transferred: increase it with the number of transferred bytes
+ */
static int save_xbzrle_page(QEMUFile *f, uint8_t **current_data,
ram_addr_t current_addr, RAMBlock *block,
- ram_addr_t offset, int cont, bool last_stage)
+ ram_addr_t offset, int cont, bool last_stage,
+ uint64_t *bytes_transferred)
{
- int encoded_len = 0, bytes_sent = -1;
+ int encoded_len = 0, bytes_xbzrle;
uint8_t *prev_cached_page;
if (!cache_is_cached(XBZRLE.cache, current_addr, bitmap_sync_count)) {
@@ -404,15 +420,16 @@ static int save_xbzrle_page(QEMUFile *f, uint8_t **current_data,
}
/* Send XBZRLE based compressed page */
- bytes_sent = save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_XBZRLE);
+ bytes_xbzrle = save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_XBZRLE);
qemu_put_byte(f, ENCODING_FLAG_XBZRLE);
qemu_put_be16(f, encoded_len);
qemu_put_buffer(f, XBZRLE.encoded_buf, encoded_len);
- bytes_sent += encoded_len + 1 + 2;
+ bytes_xbzrle += encoded_len + 1 + 2;
acct_info.xbzrle_pages++;
- acct_info.xbzrle_bytes += bytes_sent;
+ acct_info.xbzrle_bytes += bytes_xbzrle;
+ *bytes_transferred += bytes_xbzrle;
- return bytes_sent;
+ return 1;
}
static inline
@@ -634,19 +651,8 @@ static int ram_save_page(QEMUFile *f, RAMBlock* block, ram_addr_t offset,
*/
xbzrle_cache_zero_page(current_addr);
} else if (!ram_bulk_stage && migrate_use_xbzrle()) {
- int bytes_sent;
-
- bytes_sent = save_xbzrle_page(f, &p, current_addr, block,
- offset, cont, last_stage);
-
- if (bytes_sent > 0) {
- *bytes_transferred += bytes_sent;
- pages = 1;
- } else if (bytes_sent == 0) {
- pages = 0;
- } else {
- pages = -1;
- }
+ pages = save_xbzrle_page(f, &p, current_addr, block,
+ offset, cont, last_stage, bytes_transferred);
if (!last_stage) {
/* Can't send this cached data async, since the cache page
* might get updated before it gets to the wire