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Re: [Qemu-block] [PATCH v2] migration/block:limit the time used for bloc
From: |
858585 jemmy |
Subject: |
Re: [Qemu-block] [PATCH v2] migration/block:limit the time used for block migration |
Date: |
Wed, 5 Apr 2017 17:03:37 +0800 |
sorry, i make a mistake, ignore this patch.
On Wed, Apr 5, 2017 at 4:58 PM, <address@hidden> wrote:
> From: Lidong Chen <address@hidden>
>
> when migration with quick speed, mig_save_device_bulk invoke
> bdrv_is_allocated too frequently, and cause vnc reponse slowly.
> this patch limit the time used for bdrv_is_allocated.
>
> Signed-off-by: Lidong Chen <address@hidden>
> ---
> migration/block.c | 38 ++++++++++++++++++++++++++++++--------
> 1 file changed, 30 insertions(+), 8 deletions(-)
>
> diff --git a/migration/block.c b/migration/block.c
> index 7734ff7..9d7a8ee 100644
> --- a/migration/block.c
> +++ b/migration/block.c
> @@ -39,6 +39,7 @@
> #define MAX_IS_ALLOCATED_SEARCH 65536
>
> #define MAX_INFLIGHT_IO 512
> +#define BIG_DELAY 500000
>
> //#define DEBUG_BLK_MIGRATION
>
> @@ -110,6 +111,7 @@ typedef struct BlkMigState {
> int transferred;
> int prev_progress;
> int bulk_completed;
> + int64_t time_ns_used;
>
> /* Lock must be taken _inside_ the iothread lock and any AioContexts. */
> QemuMutex lock;
> @@ -272,16 +274,32 @@ static int mig_save_device_bulk(QEMUFile *f,
> BlkMigDevState *bmds)
> BlockBackend *bb = bmds->blk;
> BlkMigBlock *blk;
> int nr_sectors;
> + uint64_t ts1, ts2;
> + int ret = 0;
> + bool timeout_flag = false;
>
> if (bmds->shared_base) {
> qemu_mutex_lock_iothread();
> aio_context_acquire(blk_get_aio_context(bb));
> /* Skip unallocated sectors; intentionally treats failure as
> * an allocated sector */
> - while (cur_sector < total_sectors &&
> - !bdrv_is_allocated(blk_bs(bb), cur_sector,
> - MAX_IS_ALLOCATED_SEARCH, &nr_sectors)) {
> - cur_sector += nr_sectors;
> + while (cur_sector < total_sectors) {
> + ts1 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
> + ret = bdrv_is_allocated(blk_bs(bb), cur_sector,
> + MAX_IS_ALLOCATED_SEARCH, &nr_sectors);
> + ts2 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
> +
> + block_mig_state.time_ns_used += ts2 - ts1;
> +
> + if (!ret) {
> + cur_sector += nr_sectors;
> + if (block_mig_state.time_ns_used > BIG_DELAY) {
> + timeout_flag = true;
> + break;
> + }
> + } else {
> + break;
> + }
> }
> aio_context_release(blk_get_aio_context(bb));
> qemu_mutex_unlock_iothread();
> @@ -292,6 +310,11 @@ static int mig_save_device_bulk(QEMUFile *f,
> BlkMigDevState *bmds)
> return 1;
> }
>
> + if (timeout_flag) {
> + bmds->cur_sector = bmds->completed_sectors = cur_sector;
> + return 0;
> + }
> +
> bmds->completed_sectors = cur_sector;
>
> cur_sector &= ~((int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK - 1);
> @@ -576,9 +599,6 @@ static int mig_save_device_dirty(QEMUFile *f,
> BlkMigDevState *bmds,
> }
>
> bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, sector, nr_sectors);
> - sector += nr_sectors;
> - bmds->cur_dirty = sector;
> -
> break;
> }
> sector += BDRV_SECTORS_PER_DIRTY_CHUNK;
> @@ -756,6 +776,7 @@ static int block_save_iterate(QEMUFile *f, void *opaque)
> }
>
> blk_mig_reset_dirty_cursor();
> + block_mig_state.time_ns_used = 0;
>
> /* control the rate of transfer */
> blk_mig_lock();
> @@ -764,7 +785,8 @@ static int block_save_iterate(QEMUFile *f, void *opaque)
> qemu_file_get_rate_limit(f) &&
> (block_mig_state.submitted +
> block_mig_state.read_done) <
> - MAX_INFLIGHT_IO) {
> + MAX_INFLIGHT_IO &&
> + block_mig_state.time_ns_used <= BIG_DELAY) {
> blk_mig_unlock();
> if (block_mig_state.bulk_completed == 0) {
> /* first finish the bulk phase */
> --
> 1.8.3.1
>