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ram_find_and_save_block: 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 19:33:05 +01:00
parent 6e1dea46b8
commit 0fcd8d3140
1 changed files with 23 additions and 22 deletions
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45
arch_init.c
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@ -654,16 +654,21 @@ static int ram_save_page(QEMUFile *f, RAMBlock* block, ram_addr_t offset,
return bytes_sent;
}
/*
* ram_find_and_save_block: Finds a page to send and sends it to f
/**
* ram_find_and_save_block: Finds a dirty page and sends it to f
*
* Called within an RCU critical section.
*
* Returns: The number of bytes written.
* Returns: The number of pages written
* 0 means no dirty pages
*
* @f: QEMUFile where to send the data
* @last_stage: if we are at the completion stage
* @bytes_transferred: increase it with the number of transferred bytes
*/
static int ram_find_and_save_block(QEMUFile *f, bool last_stage)
static int ram_find_and_save_block(QEMUFile *f, bool last_stage,
uint64_t *bytes_transferred)
{
RAMBlock *block = last_seen_block;
ram_addr_t offset = last_offset;
@ -702,7 +707,10 @@ static int ram_find_and_save_block(QEMUFile *f, bool last_stage)
last_seen_block = block;
last_offset = offset;
return bytes_sent;
*bytes_transferred += bytes_sent;
return (bytes_sent != 0);
}
static uint64_t bytes_transferred;
@ -886,7 +894,7 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
int ret;
int i;
int64_t t0;
int total_sent = 0;
int pages_sent = 0;
rcu_read_lock();
if (ram_list.version != last_version) {
@ -901,14 +909,14 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
i = 0;
while ((ret = qemu_file_rate_limit(f)) == 0) {
int bytes_sent;
int pages;
bytes_sent = ram_find_and_save_block(f, false);
/* no more blocks to sent */
if (bytes_sent == 0) {
pages = ram_find_and_save_block(f, false, &bytes_transferred);
/* no more pages to sent */
if (pages == 0) {
break;
}
total_sent += bytes_sent;
pages_sent += pages;
acct_info.iterations++;
check_guest_throttling();
/* we want to check in the 1st loop, just in case it was the 1st time
@ -934,12 +942,6 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
*/
ram_control_after_iterate(f, RAM_CONTROL_ROUND);
bytes_transferred += total_sent;
/*
* Do not count these 8 bytes into total_sent, so that we can
* return 0 if no page had been dirtied.
*/
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
bytes_transferred += 8;
@ -948,7 +950,7 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
return ret;
}
return total_sent;
return pages_sent;
}
/* Called with iothread lock */
@ -964,14 +966,13 @@ static int ram_save_complete(QEMUFile *f, void *opaque)
/* flush all remaining blocks regardless of rate limiting */
while (true) {
int bytes_sent;
int pages;
bytes_sent = ram_find_and_save_block(f, true);
pages = ram_find_and_save_block(f, true, &bytes_transferred);
/* no more blocks to sent */
if (bytes_sent == 0) {
if (pages == 0) {
break;
}
bytes_transferred += bytes_sent;
}
ram_control_after_iterate(f, RAM_CONTROL_FINISH);