[Qemu-devel] [PATCH 18/22] virtio-blk: add virtio_blk_handle_read trace event

[Kevin Wolf <kwolf@redhat.com>]

From: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

There already exists a virtio_blk_handle_write trace event as well as
completion events.  Add the virtio_blk_handle_read event so it's easy to
trace virtio-blk requests for both read and write operations.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 hw/virtio-blk.c |    2 ++
 trace-events    |    1 +
 2 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index 5b416c3..a5a4396 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -346,6 +346,8 @@ static void virtio_blk_handle_read(VirtIOBlockReq *req)
 
     bdrv_acct_start(req->dev->bs, &req->acct, req->qiov.size, BDRV_ACCT_READ);
 
+    trace_virtio_blk_handle_read(req, sector, req->qiov.size / 512);
+
     if (sector & req->dev->sector_mask) {
         virtio_blk_rw_complete(req, -EIO);
         return;
diff --git a/trace-events b/trace-events
index ad77e0a..75f6e17 100644
--- a/trace-events
+++ b/trace-events
@@ -83,6 +83,7 @@ qmp_block_stream(void *bs, void *job) "bs %p job %p"
 virtio_blk_req_complete(void *req, int status) "req %p status %d"
 virtio_blk_rw_complete(void *req, int ret) "req %p ret %d"
 virtio_blk_handle_write(void *req, uint64_t sector, size_t nsectors) "req %p sector %"PRIu64" nsectors %zu"
+virtio_blk_handle_read(void *req, uint64_t sector, size_t nsectors) "req %p sector %"PRIu64" nsectors %zu"
 
 # posix-aio-compat.c
 paio_submit(void *acb, void *opaque, int64_t sector_num, int nb_sectors, int type) "acb %p opaque %p sector_num %"PRId64" nb_sectors %d type %d"
-- 
1.7.6.5