mirror of https://github.com/xemu-project/xemu.git
savevm: split save_live into stage2 and stage3
We split it into 2 functions, foo_live_iterate, and foo_live_complete. At this point, we only remove the bits that are for the other stage, functionally this is equivalent to previous code. Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Juan Quintela
parent
d1315aac6e
commit
16310a3cca
74
arch_init.c
74
arch_init.c
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@ -374,12 +374,13 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
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return 0;
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}
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static int ram_save_live(QEMUFile *f, int stage, void *opaque)
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static int ram_save_iterate(QEMUFile *f, void *opaque)
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{
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uint64_t bytes_transferred_last;
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double bwidth = 0;
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int ret;
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int i;
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uint64_t expected_time;
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memory_global_sync_dirty_bitmap(get_system_memory());
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@ -424,28 +425,64 @@ static int ram_save_live(QEMUFile *f, int stage, void *opaque)
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bwidth = 0.000001;
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}
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/* try transferring iterative blocks of memory */
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if (stage == 3) {
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int bytes_sent;
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qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
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/* flush all remaining blocks regardless of rate limiting */
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while ((bytes_sent = ram_save_block(f)) != 0) {
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bytes_transferred += bytes_sent;
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expected_time = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
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DPRINTF("ram_save_live: expected(" PRIu64 ") <= max(" PRIu64 ")?\n",
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expected_time, migrate_max_downtime());
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return expected_time <= migrate_max_downtime();
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}
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static int ram_save_complete(QEMUFile *f, void *opaque)
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{
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double bwidth = 0;
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int ret;
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int i;
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int bytes_sent;
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memory_global_sync_dirty_bitmap(get_system_memory());
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bwidth = qemu_get_clock_ns(rt_clock);
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i = 0;
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while ((ret = qemu_file_rate_limit(f)) == 0) {
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bytes_sent = ram_save_block(f);
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bytes_transferred += bytes_sent;
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if (bytes_sent == 0) { /* no more blocks */
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break;
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}
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memory_global_dirty_log_stop();
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/* we want to check in the 1st loop, just in case it was the 1st time
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and we had to sync the dirty bitmap.
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qemu_get_clock_ns() is a bit expensive, so we only check each some
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iterations
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*/
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if ((i & 63) == 0) {
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uint64_t t1 = (qemu_get_clock_ns(rt_clock) - bwidth) / 1000000;
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if (t1 > MAX_WAIT) {
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DPRINTF("big wait: " PRIu64 " milliseconds, %d iterations\n",
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t1, i);
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break;
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}
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}
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i++;
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}
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if (ret < 0) {
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return ret;
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}
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/* try transferring iterative blocks of memory */
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/* flush all remaining blocks regardless of rate limiting */
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while ((bytes_sent = ram_save_block(f)) != 0) {
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bytes_transferred += bytes_sent;
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}
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memory_global_dirty_log_stop();
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qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
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if (stage == 2) {
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uint64_t expected_time;
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expected_time = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
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DPRINTF("ram_save_live: expected(" PRIu64 ") <= max(" PRIu64 ")?\n",
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expected_time, migrate_max_downtime());
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return expected_time <= migrate_max_downtime();
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}
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return 0;
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}
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@ -578,7 +615,8 @@ done:
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SaveVMHandlers savevm_ram_handlers = {
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.save_live_setup = ram_save_setup,
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.save_live_state = ram_save_live,
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.save_live_iterate = ram_save_iterate,
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.save_live_complete = ram_save_complete,
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.load_state = ram_load,
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.cancel = ram_migration_cancel,
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};
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@ -568,12 +568,12 @@ static int block_save_setup(QEMUFile *f, void *opaque)
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return 0;
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}
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static int block_save_live(QEMUFile *f, int stage, void *opaque)
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static int block_save_iterate(QEMUFile *f, void *opaque)
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{
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int ret;
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DPRINTF("Enter save live stage %d submitted %d transferred %d\n",
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stage, block_mig_state.submitted, block_mig_state.transferred);
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DPRINTF("Enter save live iterate submitted %d transferred %d\n",
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block_mig_state.submitted, block_mig_state.transferred);
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flush_blks(f);
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@ -585,56 +585,76 @@ static int block_save_live(QEMUFile *f, int stage, void *opaque)
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blk_mig_reset_dirty_cursor();
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if (stage == 2) {
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/* control the rate of transfer */
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while ((block_mig_state.submitted +
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block_mig_state.read_done) * BLOCK_SIZE <
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qemu_file_get_rate_limit(f)) {
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if (block_mig_state.bulk_completed == 0) {
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/* first finish the bulk phase */
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if (blk_mig_save_bulked_block(f) == 0) {
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/* finished saving bulk on all devices */
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block_mig_state.bulk_completed = 1;
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}
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} else {
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if (blk_mig_save_dirty_block(f, 1) == 0) {
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/* no more dirty blocks */
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break;
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}
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/* control the rate of transfer */
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while ((block_mig_state.submitted +
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block_mig_state.read_done) * BLOCK_SIZE <
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qemu_file_get_rate_limit(f)) {
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if (block_mig_state.bulk_completed == 0) {
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/* first finish the bulk phase */
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if (blk_mig_save_bulked_block(f) == 0) {
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/* finished saving bulk on all devices */
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block_mig_state.bulk_completed = 1;
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}
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} else {
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if (blk_mig_save_dirty_block(f, 1) == 0) {
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/* no more dirty blocks */
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break;
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}
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}
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flush_blks(f);
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ret = qemu_file_get_error(f);
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if (ret) {
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blk_mig_cleanup();
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return ret;
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}
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}
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if (stage == 3) {
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/* we know for sure that save bulk is completed and
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all async read completed */
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assert(block_mig_state.submitted == 0);
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flush_blks(f);
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while (blk_mig_save_dirty_block(f, 0) != 0);
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ret = qemu_file_get_error(f);
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if (ret) {
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blk_mig_cleanup();
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/* report completion */
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qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
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ret = qemu_file_get_error(f);
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if (ret) {
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return ret;
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}
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DPRINTF("Block migration completed\n");
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return ret;
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}
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qemu_put_be64(f, BLK_MIG_FLAG_EOS);
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return ((stage == 2) && is_stage2_completed());
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return is_stage2_completed();
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}
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static int block_save_complete(QEMUFile *f, void *opaque)
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{
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int ret;
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DPRINTF("Enter save live complete submitted %d transferred %d\n",
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block_mig_state.submitted, block_mig_state.transferred);
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flush_blks(f);
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ret = qemu_file_get_error(f);
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if (ret) {
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blk_mig_cleanup();
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return ret;
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}
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blk_mig_reset_dirty_cursor();
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/* we know for sure that save bulk is completed and
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all async read completed */
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assert(block_mig_state.submitted == 0);
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while (blk_mig_save_dirty_block(f, 0) != 0) {
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/* Do nothing */
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}
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blk_mig_cleanup();
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/* report completion */
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qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
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ret = qemu_file_get_error(f);
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if (ret) {
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return ret;
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}
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DPRINTF("Block migration completed\n");
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qemu_put_be64(f, BLK_MIG_FLAG_EOS);
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return 0;
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}
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static int block_load(QEMUFile *f, void *opaque, int version_id)
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@ -731,7 +751,8 @@ static bool block_is_active(void *opaque)
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SaveVMHandlers savevm_block_handlers = {
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.set_params = block_set_params,
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.save_live_setup = block_save_setup,
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.save_live_state = block_save_live,
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.save_live_iterate = block_save_iterate,
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.save_live_complete = block_save_complete,
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.load_state = block_load,
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.cancel = block_migration_cancel,
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.is_active = block_is_active,
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10
savevm.c
10
savevm.c
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@ -1236,7 +1236,7 @@ int register_savevm_live(DeviceState *dev,
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se->vmsd = NULL;
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se->no_migrate = 0;
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/* if this is a live_savem then set is_ram */
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if (ops->save_live_state != NULL) {
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if (ops->save_live_setup != NULL) {
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se->is_ram = 1;
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}
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@ -1620,7 +1620,7 @@ int qemu_savevm_state_iterate(QEMUFile *f)
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int ret = 1;
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QTAILQ_FOREACH(se, &savevm_handlers, entry) {
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if (!se->ops || !se->ops->save_live_state) {
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if (!se->ops || !se->ops->save_live_iterate) {
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continue;
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}
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if (se->ops && se->ops->is_active) {
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@ -1636,7 +1636,7 @@ int qemu_savevm_state_iterate(QEMUFile *f)
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qemu_put_byte(f, QEMU_VM_SECTION_PART);
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qemu_put_be32(f, se->section_id);
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ret = se->ops->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
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ret = se->ops->save_live_iterate(f, se->opaque);
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trace_savevm_section_end(se->section_id);
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if (ret <= 0) {
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@ -1665,7 +1665,7 @@ int qemu_savevm_state_complete(QEMUFile *f)
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cpu_synchronize_all_states();
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QTAILQ_FOREACH(se, &savevm_handlers, entry) {
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if (!se->ops || !se->ops->save_live_state) {
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if (!se->ops || !se->ops->save_live_complete) {
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continue;
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}
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if (se->ops && se->ops->is_active) {
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@ -1678,7 +1678,7 @@ int qemu_savevm_state_complete(QEMUFile *f)
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qemu_put_byte(f, QEMU_VM_SECTION_END);
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qemu_put_be32(f, se->section_id);
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ret = se->ops->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
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ret = se->ops->save_live_complete(f, se->opaque);
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trace_savevm_section_end(se->section_id);
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if (ret < 0) {
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return ret;
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@ -33,7 +33,8 @@ typedef struct SaveVMHandlers {
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void (*set_params)(const MigrationParams *params, void * opaque);
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SaveStateHandler *save_state;
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int (*save_live_setup)(QEMUFile *f, void *opaque);
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int (*save_live_state)(QEMUFile *f, int stage, void *opaque);
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int (*save_live_iterate)(QEMUFile *f, void *opaque);
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int (*save_live_complete)(QEMUFile *f, void *opaque);
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void (*cancel)(void *opaque);
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LoadStateHandler *load_state;
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bool (*is_active)(void *opaque);
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