diff options
| author | Stefan Hajnoczi <stefanha@redhat.com> | 2014-03-21 13:55:19 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2014-03-25 14:09:50 +0100 |
| commit | 7b770c720b28b8ac5b82ae431f2f354b7f8add91 (patch) | |
| tree | 80ea19c13fa7c1cee21854bc1b96fdbf30fd25ac | |
| parent | cc8c9d6c6f28e4e376a6561a2a31524fd069bc2d (diff) | |
mirror: fix early wake from sleep due to aio
The mirror blockjob coroutine rate-limits itself by sleeping. The
coroutine also performs I/O asynchronously so it's important that the
aio callback doesn't wake the coroutine early as that breaks
rate-limiting.
Reported-by: Joaquim Barrera <jbarrera@ac.upc.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
| -rw-r--r-- | block/mirror.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/block/mirror.c b/block/mirror.c index adb09cf4ab..0ef41f999e 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -98,7 +98,14 @@ static void mirror_iteration_done(MirrorOp *op, int ret) qemu_iovec_destroy(&op->qiov); g_slice_free(MirrorOp, op); - qemu_coroutine_enter(s->common.co, NULL); + + /* 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) { + qemu_coroutine_enter(s->common.co, NULL); + } } static void mirror_write_complete(void *opaque, int ret) |