return acct_info.xbzrle_overflows;
}
-static void save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
- int cont, int flag)
+static size_t save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
+ int cont, int flag)
{
- qemu_put_be64(f, offset | cont | flag);
- if (!cont) {
- qemu_put_byte(f, strlen(block->idstr));
- qemu_put_buffer(f, (uint8_t *)block->idstr,
- strlen(block->idstr));
- }
+ size_t size;
+
+ qemu_put_be64(f, offset | cont | flag);
+ size = 8;
+ if (!cont) {
+ qemu_put_byte(f, strlen(block->idstr));
+ qemu_put_buffer(f, (uint8_t *)block->idstr,
+ strlen(block->idstr));
+ size += 1 + strlen(block->idstr);
+ }
+ return size;
}
#define ENCODING_FLAG_XBZRLE 0x1
if (!cache_is_cached(XBZRLE.cache, current_addr)) {
if (!last_stage) {
- cache_insert(XBZRLE.cache, current_addr,
- g_memdup(current_data, TARGET_PAGE_SIZE));
+ cache_insert(XBZRLE.cache, current_addr, current_data);
}
acct_info.xbzrle_cache_miss++;
return -1;
}
/* Send XBZRLE based compressed page */
- save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_XBZRLE);
+ bytes_sent = 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_sent += encoded_len + 1 + 2;
acct_info.xbzrle_pages++;
acct_info.xbzrle_bytes += bytes_sent;
return bytes_sent;
}
-static RAMBlock *last_block;
+
+/* This is the last block that we have visited serching for dirty pages
+ */
+static RAMBlock *last_seen_block;
+/* This is the last block from where we have sent data */
+static RAMBlock *last_sent_block;
static ram_addr_t last_offset;
static unsigned long *migration_bitmap;
static uint64_t migration_dirty_pages;
+static uint32_t last_version;
-static inline bool migration_bitmap_test_and_reset_dirty(MemoryRegion *mr,
- ram_addr_t offset)
+static inline
+ram_addr_t migration_bitmap_find_and_reset_dirty(MemoryRegion *mr,
+ ram_addr_t start)
{
- bool ret;
- int nr = (mr->ram_addr + offset) >> TARGET_PAGE_BITS;
+ unsigned long base = mr->ram_addr >> TARGET_PAGE_BITS;
+ unsigned long nr = base + (start >> TARGET_PAGE_BITS);
+ unsigned long size = base + (int128_get64(mr->size) >> TARGET_PAGE_BITS);
- ret = test_and_clear_bit(nr, migration_bitmap);
+ unsigned long next = find_next_bit(migration_bitmap, size, nr);
- if (ret) {
+ if (next < size) {
+ clear_bit(next, migration_bitmap);
migration_dirty_pages--;
}
- return ret;
+ return (next - base) << TARGET_PAGE_BITS;
}
static inline bool migration_bitmap_set_dirty(MemoryRegion *mr,
return ret;
}
+/* Needs iothread lock! */
+
static void migration_bitmap_sync(void)
{
RAMBlock *block;
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
for (addr = 0; addr < block->length; addr += TARGET_PAGE_SIZE) {
- if (memory_region_get_dirty(block->mr, addr, TARGET_PAGE_SIZE,
- DIRTY_MEMORY_MIGRATION)) {
+ if (memory_region_test_and_clear_dirty(block->mr,
+ addr, TARGET_PAGE_SIZE,
+ DIRTY_MEMORY_MIGRATION)) {
migration_bitmap_set_dirty(block->mr, addr);
}
}
- memory_region_reset_dirty(block->mr, 0, block->length,
- DIRTY_MEMORY_MIGRATION);
}
trace_migration_bitmap_sync_end(migration_dirty_pages
- num_dirty_pages_init);
if (end_time > start_time + 1000) {
s->dirty_pages_rate = num_dirty_pages_period * 1000
/ (end_time - start_time);
+ s->dirty_bytes_rate = s->dirty_pages_rate * TARGET_PAGE_SIZE;
start_time = end_time;
num_dirty_pages_period = 0;
}
}
-
/*
* ram_save_block: Writes a page of memory to the stream f
*
- * Returns: 0: if the page hasn't changed
- * -1: if there are no more dirty pages
- * n: the amount of bytes written in other case
+ * Returns: The number of bytes written.
+ * 0 means no dirty pages
*/
static int ram_save_block(QEMUFile *f, bool last_stage)
{
- RAMBlock *block = last_block;
+ RAMBlock *block = last_seen_block;
ram_addr_t offset = last_offset;
- int bytes_sent = -1;
+ bool complete_round = false;
+ int bytes_sent = 0;
MemoryRegion *mr;
ram_addr_t current_addr;
if (!block)
block = QTAILQ_FIRST(&ram_list.blocks);
- do {
+ while (true) {
mr = block->mr;
- if (migration_bitmap_test_and_reset_dirty(mr, offset)) {
+ offset = migration_bitmap_find_and_reset_dirty(mr, offset);
+ if (complete_round && block == last_seen_block &&
+ offset >= last_offset) {
+ break;
+ }
+ if (offset >= block->length) {
+ offset = 0;
+ block = QTAILQ_NEXT(block, next);
+ if (!block) {
+ block = QTAILQ_FIRST(&ram_list.blocks);
+ complete_round = true;
+ }
+ } else {
uint8_t *p;
- int cont = (block == last_block) ? RAM_SAVE_FLAG_CONTINUE : 0;
+ int cont = (block == last_sent_block) ?
+ RAM_SAVE_FLAG_CONTINUE : 0;
p = memory_region_get_ram_ptr(mr) + offset;
+ /* In doubt sent page as normal */
+ bytes_sent = -1;
if (is_dup_page(p)) {
acct_info.dup_pages++;
- save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_COMPRESS);
+ bytes_sent = save_block_hdr(f, block, offset, cont,
+ RAM_SAVE_FLAG_COMPRESS);
qemu_put_byte(f, *p);
- bytes_sent = 1;
+ bytes_sent += 1;
} else if (migrate_use_xbzrle()) {
current_addr = block->offset + offset;
bytes_sent = save_xbzrle_page(f, p, current_addr, block,
}
}
- /* either we didn't send yet (we may have had XBZRLE overflow) */
+ /* XBZRLE overflow or normal page */
if (bytes_sent == -1) {
- save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
+ bytes_sent = save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
- bytes_sent = TARGET_PAGE_SIZE;
+ bytes_sent += TARGET_PAGE_SIZE;
acct_info.norm_pages++;
}
/* if page is unmodified, continue to the next */
- if (bytes_sent != 0) {
+ if (bytes_sent > 0) {
+ last_sent_block = block;
break;
}
}
-
- offset += TARGET_PAGE_SIZE;
- if (offset >= block->length) {
- offset = 0;
- block = QTAILQ_NEXT(block, next);
- if (!block)
- block = QTAILQ_FIRST(&ram_list.blocks);
- }
- } while (block != last_block || offset != last_offset);
-
- last_block = block;
+ }
+ last_seen_block = block;
last_offset = offset;
return bytes_sent;
return total;
}
-static int block_compar(const void *a, const void *b)
-{
- RAMBlock * const *ablock = a;
- RAMBlock * const *bblock = b;
-
- return strcmp((*ablock)->idstr, (*bblock)->idstr);
-}
-
-static void sort_ram_list(void)
-{
- RAMBlock *block, *nblock, **blocks;
- int n;
- n = 0;
- QTAILQ_FOREACH(block, &ram_list.blocks, next) {
- ++n;
- }
- blocks = g_malloc(n * sizeof *blocks);
- n = 0;
- QTAILQ_FOREACH_SAFE(block, &ram_list.blocks, next, nblock) {
- blocks[n++] = block;
- QTAILQ_REMOVE(&ram_list.blocks, block, next);
- }
- qsort(blocks, n, sizeof *blocks, block_compar);
- while (--n >= 0) {
- QTAILQ_INSERT_HEAD(&ram_list.blocks, blocks[n], next);
- }
- g_free(blocks);
-}
-
static void migration_end(void)
{
if (migration_bitmap) {
migration_end();
}
-
static void reset_ram_globals(void)
{
- last_block = NULL;
+ last_seen_block = NULL;
+ last_sent_block = NULL;
last_offset = 0;
- sort_ram_list();
+ last_version = ram_list.version;
}
#define MAX_WAIT 50 /* ms, half buffered_file limit */
bitmap_set(migration_bitmap, 0, ram_pages);
migration_dirty_pages = ram_pages;
- bytes_transferred = 0;
- reset_ram_globals();
-
if (migrate_use_xbzrle()) {
XBZRLE.cache = cache_init(migrate_xbzrle_cache_size() /
TARGET_PAGE_SIZE,
acct_clear();
}
+ qemu_mutex_lock_iothread();
+ qemu_mutex_lock_ramlist();
+ bytes_transferred = 0;
+ reset_ram_globals();
+
memory_global_dirty_log_start();
migration_bitmap_sync();
+ qemu_mutex_unlock_iothread();
qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
qemu_put_be64(f, block->length);
}
+ qemu_mutex_unlock_ramlist();
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
return 0;
static int ram_save_iterate(QEMUFile *f, void *opaque)
{
- uint64_t bytes_transferred_last;
- double bwidth = 0;
int ret;
int i;
- uint64_t expected_downtime;
- MigrationState *s = migrate_get_current();
+ int64_t t0;
+ int total_sent = 0;
- bytes_transferred_last = bytes_transferred;
- bwidth = qemu_get_clock_ns(rt_clock);
+ qemu_mutex_lock_ramlist();
+ if (ram_list.version != last_version) {
+ reset_ram_globals();
+ }
+
+ t0 = qemu_get_clock_ns(rt_clock);
i = 0;
while ((ret = qemu_file_rate_limit(f)) == 0) {
int bytes_sent;
bytes_sent = ram_save_block(f, false);
/* no more blocks to sent */
- if (bytes_sent < 0) {
+ if (bytes_sent == 0) {
break;
}
- bytes_transferred += bytes_sent;
+ total_sent += bytes_sent;
acct_info.iterations++;
/* we want to check in the 1st loop, just in case it was the 1st time
and we had to sync the dirty bitmap.
iterations
*/
if ((i & 63) == 0) {
- uint64_t t1 = (qemu_get_clock_ns(rt_clock) - bwidth) / 1000000;
+ uint64_t t1 = (qemu_get_clock_ns(rt_clock) - t0) / 1000000;
if (t1 > MAX_WAIT) {
DPRINTF("big wait: %" PRIu64 " milliseconds, %d iterations\n",
t1, i);
i++;
}
+ qemu_mutex_unlock_ramlist();
+
if (ret < 0) {
+ bytes_transferred += total_sent;
return ret;
}
- bwidth = qemu_get_clock_ns(rt_clock) - bwidth;
- bwidth = (bytes_transferred - bytes_transferred_last) / bwidth;
-
- /* if we haven't transferred anything this round, force
- * expected_downtime to a very high value, but without
- * crashing */
- if (bwidth == 0) {
- bwidth = 0.000001;
- }
-
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
+ total_sent += 8;
+ bytes_transferred += total_sent;
- expected_downtime = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
- DPRINTF("ram_save_live: expected(%" PRIu64 ") <= max(" PRIu64 ")?\n",
- expected_downtime, migrate_max_downtime());
-
- if (expected_downtime <= migrate_max_downtime()) {
- migration_bitmap_sync();
- expected_downtime = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
- s->expected_downtime = expected_downtime / 1000000; /* ns -> ms */
-
- return expected_downtime <= migrate_max_downtime();
- }
- return 0;
+ return total_sent;
}
static int ram_save_complete(QEMUFile *f, void *opaque)
{
+ qemu_mutex_lock_ramlist();
migration_bitmap_sync();
/* try transferring iterative blocks of memory */
bytes_sent = ram_save_block(f, true);
/* no more blocks to sent */
- if (bytes_sent < 0) {
+ if (bytes_sent == 0) {
break;
}
bytes_transferred += bytes_sent;
}
migration_end();
+ qemu_mutex_unlock_ramlist();
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
return 0;
}
+static uint64_t ram_save_pending(QEMUFile *f, void *opaque, uint64_t max_size)
+{
+ uint64_t remaining_size;
+
+ remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE;
+
+ if (remaining_size < max_size) {
+ qemu_mutex_lock_iothread();
+ migration_bitmap_sync();
+ qemu_mutex_unlock_iothread();
+ remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE;
+ }
+ return remaining_size;
+}
+
static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host)
{
int ret, rc = 0;
qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
} else if (flags & RAM_SAVE_FLAG_XBZRLE) {
- if (!migrate_use_xbzrle()) {
- return -EINVAL;
- }
void *host = host_from_stream_offset(f, addr, flags);
if (!host) {
return -EINVAL;
.save_live_setup = ram_save_setup,
.save_live_iterate = ram_save_iterate,
.save_live_complete = ram_save_complete,
+ .save_live_pending = ram_save_pending,
.load_state = ram_load,
.cancel = ram_migration_cancel,
};
projects / qemu.git / blobdiff