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block: add BDS field to count in-flight requests

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Unlike tracked_requests, this field also counts throttled requests,
and remains non-zero if an AIO operation needs a BH to be "really"
completed.

With this change, it is no longer necessary to have a dummy
BdrvTrackedRequest for requests that are never serialising, and
it is no longer necessary to poll the AioContext once after
bdrv_requests_pending(bs) returns false.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-Id: <1477565348-5458-5-git-send-email-pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-10-27 12:48:52 +02:00 • committed by Fam Zheng
parent 9a0cec664e
commit 9972354856
3 changed files with 75 additions and 33 deletions
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10
include/block/block_int.h
View file

@ -62,8 +62,6 @@
enum BdrvTrackedRequestType {
BDRV_TRACKED_READ,
BDRV_TRACKED_WRITE,
BDRV_TRACKED_FLUSH,
BDRV_TRACKED_IOCTL,
BDRV_TRACKED_DISCARD,
};
@ -445,7 +443,7 @@ struct BlockDriverState {
note this is a reference count */
CoQueue flush_queue; /* Serializing flush queue */
BdrvTrackedRequest *active_flush_req; /* Flush request in flight */
bool active_flush_req; /* Flush request in flight? */
unsigned int write_gen; /* Current data generation */
unsigned int flushed_gen; /* Flushed write generation */
@ -473,7 +471,8 @@ struct BlockDriverState {
/* Callback before write request is processed */
NotifierWithReturnList before_write_notifiers;
/* number of in-flight serialising requests */
/* number of in-flight requests; overall and serialising */
unsigned int in_flight;
unsigned int serialising_in_flight;
/* Offset after the highest byte written to */
@ -787,6 +786,9 @@ bool bdrv_requests_pending(BlockDriverState *bs);
void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out);
void bdrv_undo_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *in);
void bdrv_inc_in_flight(BlockDriverState *bs);
void bdrv_dec_in_flight(BlockDriverState *bs);
void blockdev_close_all_bdrv_states(void);
#endif /* BLOCK_INT_H */