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migration: Split save_zero_page from ram_save_page 

Split the function save_zero_page from ram_save_page so that we can
reuse it later.

Signed-off-by: Liang Li <liang.z.li@intel.com>
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Liang Li 2015-03-23 16:32:22 +08:00 committed by Juan Quintela
parent 3caf633dbd
commit e2102428c0
1 changed files with 43 additions and 18 deletions
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61
arch_init.c
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@ -715,6 +715,34 @@ static void migration_bitmap_sync(void)
}
}
/**
* save_zero_page: Send the zero page to the stream
*
* Returns: Number of pages written.
*
* @f: QEMUFile where to send the data
* @block: block that contains the page we want to send
* @offset: offset inside the block for the page
* @p: pointer to the page
* @bytes_transferred: increase it with the number of transferred bytes
*/
static int save_zero_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
uint8_t *p, uint64_t *bytes_transferred)
{
int pages = -1;
if (is_zero_range(p, TARGET_PAGE_SIZE)) {
acct_info.dup_pages++;
*bytes_transferred += save_page_header(f, block,
offset | RAM_SAVE_FLAG_COMPRESS);
qemu_put_byte(f, 0);
*bytes_transferred += 1;
pages = 1;
}
return pages;
}
/**
* ram_save_page: Send the given page to the stream
*
@ -763,25 +791,22 @@ static int ram_save_page(QEMUFile *f, RAMBlock* block, ram_addr_t offset,
acct_info.dup_pages++;
}
}
} else if (is_zero_range(p, TARGET_PAGE_SIZE)) {
acct_info.dup_pages++;
*bytes_transferred += save_page_header(f, block,
offset | RAM_SAVE_FLAG_COMPRESS);
qemu_put_byte(f, 0);
*bytes_transferred += 1;
pages = 1;
/* Must let xbzrle know, otherwise a previous (now 0'd) cached
* page would be stale
*/
xbzrle_cache_zero_page(current_addr);
} else if (!ram_bulk_stage && migrate_use_xbzrle()) {
pages = save_xbzrle_page(f, &p, current_addr, block,
offset, 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
} else {
pages = save_zero_page(f, block, offset, p, bytes_transferred);
if (pages > 0) {
/* Must let xbzrle know, otherwise a previous (now 0'd) cached
* page would be stale
*/
send_async = false;
xbzrle_cache_zero_page(current_addr);
} else if (!ram_bulk_stage && migrate_use_xbzrle()) {
pages = save_xbzrle_page(f, &p, current_addr, block,
offset, 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
*/
send_async = false;
}
}
}