X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=block-migration.c;h=0936c7d5ea347de19d37afe4ae7d9956381bc6d7;hb=aad04cd024f0c59f0b96f032cde2e24eb3abba6d;hp=92349a2149c48217392c33d687cc5a9c00ec617a;hpb=c730256b331cc0494793a7b9b45d3e7496a3ebad;p=qemu.git diff --git a/block-migration.c b/block-migration.c index 92349a214..0936c7d5e 100644 --- a/block-migration.c +++ b/block-migration.c @@ -19,6 +19,7 @@ #include "monitor.h" #include "block-migration.h" #include "migration.h" +#include "blockdev.h" #include #define BLOCK_SIZE (BDRV_SECTORS_PER_DIRTY_CHUNK << BDRV_SECTOR_BITS) @@ -49,17 +50,18 @@ typedef struct BlkMigDevState { int64_t total_sectors; int64_t dirty; QSIMPLEQ_ENTRY(BlkMigDevState) entry; + unsigned long *aio_bitmap; } BlkMigDevState; typedef struct BlkMigBlock { uint8_t *buf; BlkMigDevState *bmds; int64_t sector; + int nr_sectors; struct iovec iov; QEMUIOVector qiov; BlockDriverAIOCB *aiocb; int ret; - int64_t time; QSIMPLEQ_ENTRY(BlkMigBlock) entry; } BlkMigBlock; @@ -75,6 +77,7 @@ typedef struct BlkMigState { int prev_progress; int bulk_completed; long double total_time; + long double prev_time_offset; int reads; } BlkMigState; @@ -128,29 +131,71 @@ uint64_t blk_mig_bytes_total(void) return sum << BDRV_SECTOR_BITS; } -static inline void add_avg_read_time(int64_t time) +static inline long double compute_read_bwidth(void) { - block_mig_state.reads++; - block_mig_state.total_time += time; + assert(block_mig_state.total_time != 0); + return (block_mig_state.reads / block_mig_state.total_time) * BLOCK_SIZE; } -static inline long double compute_read_bwidth(void) +static int bmds_aio_inflight(BlkMigDevState *bmds, int64_t sector) { - assert(block_mig_state.total_time != 0); - return (block_mig_state.reads * BLOCK_SIZE)/ block_mig_state.total_time; + int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; + + if ((sector << BDRV_SECTOR_BITS) < bdrv_getlength(bmds->bs)) { + return !!(bmds->aio_bitmap[chunk / (sizeof(unsigned long) * 8)] & + (1UL << (chunk % (sizeof(unsigned long) * 8)))); + } else { + return 0; + } +} + +static void bmds_set_aio_inflight(BlkMigDevState *bmds, int64_t sector_num, + int nb_sectors, int set) +{ + int64_t start, end; + unsigned long val, idx, bit; + + start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; + end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; + + for (; start <= end; start++) { + idx = start / (sizeof(unsigned long) * 8); + bit = start % (sizeof(unsigned long) * 8); + val = bmds->aio_bitmap[idx]; + if (set) { + val |= 1UL << bit; + } else { + val &= ~(1UL << bit); + } + bmds->aio_bitmap[idx] = val; + } +} + +static void alloc_aio_bitmap(BlkMigDevState *bmds) +{ + BlockDriverState *bs = bmds->bs; + int64_t bitmap_size; + + bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + + BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; + bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; + + bmds->aio_bitmap = qemu_mallocz(bitmap_size); } static void blk_mig_read_cb(void *opaque, int ret) { + long double curr_time = qemu_get_clock_ns(rt_clock); BlkMigBlock *blk = opaque; blk->ret = ret; - blk->time = qemu_get_clock_ns(rt_clock) - blk->time; - - add_avg_read_time(blk->time); + block_mig_state.reads++; + block_mig_state.total_time += (curr_time - block_mig_state.prev_time_offset); + block_mig_state.prev_time_offset = curr_time; QSIMPLEQ_INSERT_TAIL(&block_mig_state.blk_list, blk, entry); + bmds_set_aio_inflight(blk->bmds, blk->sector, blk->nr_sectors, 0); block_mig_state.submitted--; block_mig_state.read_done++; @@ -194,12 +239,15 @@ static int mig_save_device_bulk(Monitor *mon, QEMUFile *f, blk->buf = qemu_malloc(BLOCK_SIZE); blk->bmds = bmds; blk->sector = cur_sector; + blk->nr_sectors = nr_sectors; blk->iov.iov_base = blk->buf; blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; qemu_iovec_init_external(&blk->qiov, &blk->iov, 1); - blk->time = qemu_get_clock_ns(rt_clock); + if (block_mig_state.submitted == 0) { + block_mig_state.prev_time_offset = qemu_get_clock_ns(rt_clock); + } blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov, nr_sectors, blk_mig_read_cb, blk); @@ -230,12 +278,45 @@ static void set_dirty_tracking(int enable) } } -static void init_blk_migration(Monitor *mon, QEMUFile *f) +static void init_blk_migration_it(void *opaque, BlockDriverState *bs) { + Monitor *mon = opaque; BlkMigDevState *bmds; - BlockDriverState *bs; int64_t sectors; + if (!bdrv_is_read_only(bs)) { + sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; + if (sectors <= 0) { + return; + } + + bmds = qemu_mallocz(sizeof(BlkMigDevState)); + bmds->bs = bs; + bmds->bulk_completed = 0; + bmds->total_sectors = sectors; + bmds->completed_sectors = 0; + bmds->shared_base = block_mig_state.shared_base; + alloc_aio_bitmap(bmds); + drive_get_ref(drive_get_by_blockdev(bs)); + bdrv_set_in_use(bs, 1); + + block_mig_state.total_sector_sum += sectors; + + if (bmds->shared_base) { + monitor_printf(mon, "Start migration for %s with shared base " + "image\n", + bs->device_name); + } else { + monitor_printf(mon, "Start full migration for %s\n", + bs->device_name); + } + + QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry); + } +} + +static void init_blk_migration(Monitor *mon, QEMUFile *f) +{ block_mig_state.submitted = 0; block_mig_state.read_done = 0; block_mig_state.transferred = 0; @@ -245,34 +326,7 @@ static void init_blk_migration(Monitor *mon, QEMUFile *f) block_mig_state.total_time = 0; block_mig_state.reads = 0; - for (bs = bdrv_first; bs != NULL; bs = bs->next) { - if (bs->type == BDRV_TYPE_HD) { - sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; - if (sectors == 0) { - continue; - } - - bmds = qemu_mallocz(sizeof(BlkMigDevState)); - bmds->bs = bs; - bmds->bulk_completed = 0; - bmds->total_sectors = sectors; - bmds->completed_sectors = 0; - bmds->shared_base = block_mig_state.shared_base; - - block_mig_state.total_sector_sum += sectors; - - if (bmds->shared_base) { - monitor_printf(mon, "Start migration for %s with shared base " - "image\n", - bs->device_name); - } else { - monitor_printf(mon, "Start full migration for %s\n", - bs->device_name); - } - - QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry); - } - } + bdrv_iterate(init_blk_migration_it, mon); } static int blk_mig_save_bulked_block(Monitor *mon, QEMUFile *f) @@ -296,7 +350,12 @@ static int blk_mig_save_bulked_block(Monitor *mon, QEMUFile *f) } } - progress = completed_sector_sum * 100 / block_mig_state.total_sector_sum; + if (block_mig_state.total_sector_sum != 0) { + progress = completed_sector_sum * 100 / + block_mig_state.total_sector_sum; + } else { + progress = 100; + } if (progress != block_mig_state.prev_progress) { block_mig_state.prev_progress = progress; qemu_put_be64(f, (progress << BDRV_SECTOR_BITS) @@ -326,6 +385,9 @@ static int mig_save_device_dirty(Monitor *mon, QEMUFile *f, int nr_sectors; for (sector = bmds->cur_dirty; sector < bmds->total_sectors;) { + if (bmds_aio_inflight(bmds, sector)) { + qemu_aio_flush(); + } if (bdrv_get_dirty(bmds->bs, sector)) { if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) { @@ -337,13 +399,16 @@ static int mig_save_device_dirty(Monitor *mon, QEMUFile *f, blk->buf = qemu_malloc(BLOCK_SIZE); blk->bmds = bmds; blk->sector = sector; + blk->nr_sectors = nr_sectors; if (is_async) { blk->iov.iov_base = blk->buf; blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; qemu_iovec_init_external(&blk->qiov, &blk->iov, 1); - blk->time = qemu_get_clock_ns(rt_clock); + if (block_mig_state.submitted == 0) { + block_mig_state.prev_time_offset = qemu_get_clock_ns(rt_clock); + } blk->aiocb = bdrv_aio_readv(bmds->bs, sector, &blk->qiov, nr_sectors, blk_mig_read_cb, blk); @@ -351,6 +416,7 @@ static int mig_save_device_dirty(Monitor *mon, QEMUFile *f, goto error; } block_mig_state.submitted++; + bmds_set_aio_inflight(bmds, sector, nr_sectors, 1); } else { if (bdrv_read(bmds->bs, sector, blk->buf, nr_sectors) < 0) { @@ -446,13 +512,13 @@ static int is_stage2_completed(void) if (block_mig_state.bulk_completed == 1) { remaining_dirty = get_remaining_dirty(); - if (remaining_dirty == 0) { - return 1; - } + if (remaining_dirty == 0) { + return 1; + } - bwidth = compute_read_bwidth(); + bwidth = compute_read_bwidth(); - if ((remaining_dirty / bwidth) <= + if ((remaining_dirty / bwidth) <= migrate_max_downtime()) { /* finish stage2 because we think that we can finish remaing work below max_downtime */ @@ -469,8 +535,13 @@ static void blk_mig_cleanup(Monitor *mon) BlkMigDevState *bmds; BlkMigBlock *blk; + set_dirty_tracking(0); + while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) { QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry); + bdrv_set_in_use(bmds->bs, 0); + drive_put_ref(drive_get_by_blockdev(bmds->bs)); + qemu_free(bmds->aio_bitmap); qemu_free(bmds); } @@ -480,8 +551,6 @@ static void blk_mig_cleanup(Monitor *mon) qemu_free(blk); } - set_dirty_tracking(0); - monitor_printf(mon, "\n"); } @@ -573,8 +642,10 @@ static int block_load(QEMUFile *f, void *opaque, int version_id) int len, flags; char device_name[256]; int64_t addr; - BlockDriverState *bs; + BlockDriverState *bs, *bs_prev = NULL; uint8_t *buf; + int64_t total_sectors = 0; + int nr_sectors; do { addr = qemu_get_be64(f); @@ -583,6 +654,7 @@ static int block_load(QEMUFile *f, void *opaque, int version_id) addr >>= BDRV_SECTOR_BITS; if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) { + int ret; /* get device name */ len = qemu_get_byte(f); qemu_get_buffer(f, (uint8_t *)device_name, len); @@ -595,12 +667,31 @@ static int block_load(QEMUFile *f, void *opaque, int version_id) return -EINVAL; } + if (bs != bs_prev) { + bs_prev = bs; + total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; + if (total_sectors <= 0) { + error_report("Error getting length of block device %s", + device_name); + return -EINVAL; + } + } + + if (total_sectors - addr < BDRV_SECTORS_PER_DIRTY_CHUNK) { + nr_sectors = total_sectors - addr; + } else { + nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; + } + buf = qemu_malloc(BLOCK_SIZE); qemu_get_buffer(f, buf, BLOCK_SIZE); - bdrv_write(bs, addr, buf, BDRV_SECTORS_PER_DIRTY_CHUNK); + ret = bdrv_write(bs, addr, buf, nr_sectors); qemu_free(buf); + if (ret < 0) { + return ret; + } } else if (flags & BLK_MIG_FLAG_PROGRESS) { if (!banner_printed) { printf("Receiving block device images\n"); @@ -635,6 +726,6 @@ void blk_mig_init(void) QSIMPLEQ_INIT(&block_mig_state.bmds_list); QSIMPLEQ_INIT(&block_mig_state.blk_list); - register_savevm_live("block", 0, 1, block_set_params, block_save_live, - NULL, block_load, &block_mig_state); + register_savevm_live(NULL, "block", 0, 1, block_set_params, + block_save_live, NULL, block_load, &block_mig_state); }