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trace: Trace bdrv_aio_{readv,writev} 

Observing block layer aio readv/writev operations is useful for
debugging image formats or understanding guest disk I/O patterns.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Stefan Hajnoczi 2010-10-05 14:28:53 +01:00 committed by Blue Swirl
parent ea9c16989b
commit bbf0a44081
2 changed files with 6 additions and 0 deletions
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4
block.c
View File

@ -1983,6 +1983,8 @@ BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
BlockDriver *drv = bs->drv;
BlockDriverAIOCB *ret;
trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque);
if (!drv)
return NULL;
if (bdrv_check_request(bs, sector_num, nb_sectors))
@ -2007,6 +2009,8 @@ BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
BlockDriver *drv = bs->drv;
BlockDriverAIOCB *ret;
trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque);
if (!drv)
return NULL;
if (bs->read_only)

2
trace-events
View File

@ -51,6 +51,8 @@ disable multiwrite_cb(void *mcb, int ret) "mcb %p ret %d"
disable bdrv_aio_multiwrite(void *mcb, int num_callbacks, int num_reqs) "mcb %p num_callbacks %d num_reqs %d"
disable bdrv_aio_multiwrite_earlyfail(void *mcb) "mcb %p"
disable bdrv_aio_multiwrite_latefail(void *mcb, int i) "mcb %p i %d"
disable bdrv_aio_readv(void *bs, int64_t sector_num, int nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
disable bdrv_aio_writev(void *bs, int64_t sector_num, int nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
# hw/virtio-blk.c
disable virtio_blk_req_complete(void *req, int status) "req %p status %d"