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| author | John Snow <jsnow@redhat.com> | 2018-03-10 03:27:30 -0500 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2018-03-19 12:01:24 +0100 |
| commit | c9de40505f257a325e76f630c203432c77795461 (patch) | |
| tree | ae91d8a3b13c7fa03c14cde589dcee016ed33210 /block/trace-events | |
| parent | 58b295ba52c97a8d9e8cb526961a43b701dd2730 (diff) | |
| download | qemu-c9de40505f257a325e76f630c203432c77795461.tar.gz | |
blockjobs: add state transition table
The state transition table has mostly been implied. We're about to make
it a bit more complex, so let's make the STM explicit instead.
Perform state transitions with a function that for now just asserts the
transition is appropriate.
Transitions:
Undefined -> Created: During job initialization.
Created -> Running: Once the job is started.
Jobs cannot transition from "Created" to "Paused"
directly, but will instead synchronously transition
to running to paused immediately.
Running -> Paused: Normal workflow for pauses.
Running -> Ready: Normal workflow for jobs reaching their sync point.
(e.g. mirror)
Ready -> Standby: Normal workflow for pausing ready jobs.
Paused -> Running: Normal resume.
Standby -> Ready: Resume of a Standby job.
+---------+
|UNDEFINED|
+--+------+
|
+--v----+
|CREATED|
+--+----+
|
+--v----+ +------+
|RUNNING<----->PAUSED|
+--+----+ +------+
|
+--v--+ +-------+
|READY<------->STANDBY|
+-----+ +-------+
Notably, there is no state presently defined as of this commit that
deals with a job after the "running" or "ready" states, so this table
will be adjusted alongside the commits that introduce those states.
Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/trace-events')
| -rw-r--r-- | block/trace-events | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/trace-events b/block/trace-events index 7493d521dc..112a8972bb 100644 --- a/block/trace-events +++ b/block/trace-events @@ -4,6 +4,9 @@ bdrv_open_common(void *bs, const char *filename, int flags, const char *format_name) "bs %p filename \"%s\" flags 0x%x format_name \"%s\"" bdrv_lock_medium(void *bs, bool locked) "bs %p locked %d" +# blockjob.c +block_job_state_transition(void *job, int ret, const char *legal, const char *s0, const char *s1) "job %p (ret: %d) attempting %s transition (%s-->%s)" + # block/block-backend.c blk_co_preadv(void *blk, void *bs, int64_t offset, unsigned int bytes, int flags) "blk %p bs %p offset %"PRId64" bytes %u flags 0x%x" blk_co_pwritev(void *blk, void *bs, int64_t offset, unsigned int bytes, int flags) "blk %p bs %p offset %"PRId64" bytes %u flags 0x%x" |