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ram_save_page: change calling covention 

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 20:03:45 +01:00
parent 0fcd8d3140
commit 87cf878b2e
1 changed files with 38 additions and 19 deletions
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57
arch_init.c
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@ -575,15 +575,21 @@ static void migration_bitmap_sync(void)
}
}
/*
/**
* ram_save_page: Send the given page to the stream
*
* Returns: Number of bytes written.
* 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
* @last_stage: if we are at the completion stage
* @bytes_transferred: increase it with the number of transferred bytes
*/
static int ram_save_page(QEMUFile *f, RAMBlock* block, ram_addr_t offset,
bool last_stage)
bool last_stage, uint64_t *bytes_transferred)
{
int bytes_sent;
int pages = -1;
uint64_t bytes_xmit;
int cont;
ram_addr_t current_addr;
@ -597,12 +603,12 @@ static int ram_save_page(QEMUFile *f, RAMBlock* block, ram_addr_t offset,
p = memory_region_get_ram_ptr(mr) + offset;
/* In doubt sent page as normal */
bytes_sent = -1;
bytes_xmit = 0;
ret = ram_control_save_page(f, block->offset,
offset, TARGET_PAGE_SIZE, &bytes_xmit);
if (bytes_xmit) {
bytes_sent = bytes_xmit;
*bytes_transferred += bytes_xmit;
pages = 1;
}
XBZRLE_cache_lock();
@ -618,17 +624,29 @@ static int ram_save_page(QEMUFile *f, RAMBlock* block, ram_addr_t offset,
}
} else if (is_zero_range(p, TARGET_PAGE_SIZE)) {
acct_info.dup_pages++;
bytes_sent = save_block_hdr(f, block, offset, cont,
RAM_SAVE_FLAG_COMPRESS);
*bytes_transferred += save_block_hdr(f, block, offset, cont,
RAM_SAVE_FLAG_COMPRESS);
qemu_put_byte(f, 0);
bytes_sent++;
*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()) {
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;
}
if (!last_stage) {
/* Can't send this cached data async, since the cache page
* might get updated before it gets to the wire
@ -638,20 +656,22 @@ static int ram_save_page(QEMUFile *f, RAMBlock* block, ram_addr_t offset,
}
/* XBZRLE overflow or normal page */
if (bytes_sent == -1) {
bytes_sent = save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
if (pages == -1) {
*bytes_transferred += save_block_hdr(f, block, offset, cont,
RAM_SAVE_FLAG_PAGE);
if (send_async) {
qemu_put_buffer_async(f, p, TARGET_PAGE_SIZE);
} else {
qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
}
bytes_sent += TARGET_PAGE_SIZE;
*bytes_transferred += TARGET_PAGE_SIZE;
pages = 1;
acct_info.norm_pages++;
}
XBZRLE_cache_unlock();
return bytes_sent;
return pages;
}
/**
@ -673,7 +693,7 @@ static int ram_find_and_save_block(QEMUFile *f, bool last_stage,
RAMBlock *block = last_seen_block;
ram_addr_t offset = last_offset;
bool complete_round = false;
int bytes_sent = 0;
int pages = 0;
MemoryRegion *mr;
if (!block)
@ -695,10 +715,11 @@ static int ram_find_and_save_block(QEMUFile *f, bool last_stage,
ram_bulk_stage = false;
}
} else {
bytes_sent = ram_save_page(f, block, offset, last_stage);
pages = ram_save_page(f, block, offset, last_stage,
bytes_transferred);
/* if page is unmodified, continue to the next */
if (bytes_sent > 0) {
if (pages > 0) {
last_sent_block = block;
break;
}
@ -708,9 +729,7 @@ static int ram_find_and_save_block(QEMUFile *f, bool last_stage,
last_seen_block = block;
last_offset = offset;
*bytes_transferred += bytes_sent;
return (bytes_sent != 0);
return pages;
}
static uint64_t bytes_transferred;