diff options
| -rw-r--r-- | block/mirror.c | 19 | ||||
| -rw-r--r-- | trace-events | 1 |
2 files changed, 15 insertions, 5 deletions
diff --git a/block/mirror.c b/block/mirror.c index fc4d8f561e..94744432eb 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -60,6 +60,7 @@ typedef struct MirrorBlockJob { int sectors_in_flight; int ret; bool unmap; + bool waiting_for_io; } MirrorBlockJob; typedef struct MirrorOp { @@ -114,11 +115,7 @@ static void mirror_iteration_done(MirrorOp *op, int ret) qemu_iovec_destroy(&op->qiov); g_slice_free(MirrorOp, op); - /* Enter coroutine when it is not sleeping. The coroutine sleeps to - * rate-limit itself. The coroutine will eventually resume since there is - * a sleep timeout so don't wake it early. - */ - if (s->common.busy) { + if (s->waiting_for_io) { qemu_coroutine_enter(s->common.co, NULL); } } @@ -203,7 +200,9 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s) /* Wait for I/O to this cluster (from a previous iteration) to be done. */ while (test_bit(next_chunk, s->in_flight_bitmap)) { trace_mirror_yield_in_flight(s, sector_num, s->in_flight); + s->waiting_for_io = true; qemu_coroutine_yield(); + s->waiting_for_io = false; } do { @@ -239,12 +238,18 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s) */ while (nb_chunks == 0 && s->buf_free_count < added_chunks) { trace_mirror_yield_buf_busy(s, nb_chunks, s->in_flight); + s->waiting_for_io = true; qemu_coroutine_yield(); + s->waiting_for_io = false; } if (s->buf_free_count < nb_chunks + added_chunks) { trace_mirror_break_buf_busy(s, nb_chunks, s->in_flight); break; } + if (IOV_MAX < nb_chunks + added_chunks) { + trace_mirror_break_iov_max(s, nb_chunks, added_chunks); + break; + } /* We have enough free space to copy these sectors. */ bitmap_set(s->in_flight_bitmap, next_chunk, added_chunks); @@ -333,7 +338,9 @@ static void mirror_free_init(MirrorBlockJob *s) static void mirror_drain(MirrorBlockJob *s) { while (s->in_flight > 0) { + s->waiting_for_io = true; qemu_coroutine_yield(); + s->waiting_for_io = false; } } @@ -506,7 +513,9 @@ static void coroutine_fn mirror_run(void *opaque) if (s->in_flight == MAX_IN_FLIGHT || s->buf_free_count == 0 || (cnt == 0 && s->in_flight > 0)) { trace_mirror_yield(s, s->in_flight, s->buf_free_count, cnt); + s->waiting_for_io = true; qemu_coroutine_yield(); + s->waiting_for_io = false; continue; } else if (cnt != 0) { delay_ns = mirror_iteration(s); diff --git a/trace-events b/trace-events index 94bf3bb184..8f9614adb5 100644 --- a/trace-events +++ b/trace-events @@ -94,6 +94,7 @@ mirror_yield(void *s, int64_t cnt, int buf_free_count, int in_flight) "s %p dirt mirror_yield_in_flight(void *s, int64_t sector_num, int in_flight) "s %p sector_num %"PRId64" in_flight %d" mirror_yield_buf_busy(void *s, int nb_chunks, int in_flight) "s %p requested chunks %d in_flight %d" mirror_break_buf_busy(void *s, int nb_chunks, int in_flight) "s %p requested chunks %d in_flight %d" +mirror_break_iov_max(void *s, int nb_chunks, int added_chunks) "s %p requested chunks %d added_chunks %d" # block/backup.c backup_do_cow_enter(void *job, int64_t start, int64_t sector_num, int nb_sectors) "job %p start %"PRId64" sector_num %"PRId64" nb_sectors %d" |