diff options
| author | Christoph Hellwig <hch@lst.de> | 2011-08-25 08:26:01 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2011-08-25 18:18:42 +0200 |
| commit | a597e79ce14ea62266924acc7b8a7030a42ed29b (patch) | |
| tree | 2dfae8672b7a3b85d3fa5e138c2ffe361e97cf29 /block_int.h | |
| parent | 2f4b7593674e986e60b0b0f1a46707e0e149eb6d (diff) | |
block: explicit I/O accounting
Decouple the I/O accounting from bdrv_aio_readv/writev/flush and
make the hardware models call directly into the accounting helpers.
This means:
- we do not count internal requests from image formats in addition
to guest originating I/O
- we do not double count I/O ops if the device model handles it
chunk wise
- we only account I/O once it actuall is done
- can extent I/O accounting to synchronous or coroutine I/O easily
- implement I/O latency tracking easily (see the next patch)
I've conveted the existing device model callers to the new model,
device models that are using synchronous I/O and weren't accounted
before haven't been updated yet. Also scsi hasn't been converted
to the end-to-end accounting as I want to defer that after the pending
scsi layer overhaul.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block_int.h')
| -rw-r--r-- | block_int.h | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/block_int.h b/block_int.h index f1480d6ddd..5f8050db34 100644 --- a/block_int.h +++ b/block_int.h @@ -184,11 +184,8 @@ struct BlockDriverState { void *sync_aiocb; /* I/O stats (display with "info blockstats"). */ - uint64_t rd_bytes; - uint64_t wr_bytes; - uint64_t rd_ops; - uint64_t wr_ops; - uint64_t flush_ops; + uint64_t nr_bytes[BDRV_MAX_IOTYPE]; + uint64_t nr_ops[BDRV_MAX_IOTYPE]; uint64_t wr_highest_sector; /* Whether the disk can expand beyond total_sectors */ |