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save_xbzrle_page: change calling convention 

Add a parameter to pass the number of bytes written, and make it return
the number of pages written instead.

Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Juan Quintela 2015-02-12 20:16:33 +01:00
parent 87cf878b2e
commit f4be0f75f6
1 changed files with 25 additions and 19 deletions
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44
arch_init.c
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@ -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