diff options
| author |   Andrew Hall <hall@fb.com> | 2019-04-26 11:49:49 -0700 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2019-04-26 19:04:19 -0700 |
| commit | 2abd2de712cd891321a06b0890a85aef1e506cb5 (patch) | |
| tree | 0e133410f9fb1335c41ef94ee5e8a822206c14bb /drivers/block | |
| parent | nbd: trace sending nbd requests (diff) | |
| download | linux-dev-2abd2de712cd891321a06b0890a85aef1e506cb5.tar.xz linux-dev-2abd2de712cd891321a06b0890a85aef1e506cb5.zip | |
nbd: add tracepoints for send/receive timing
This adds four tracepoints to nbd, enabling separate tracing of payload
and header sending/receipt.
In the send path for headers that have already been sent, we also
explicitly initialize the handle so it can be referenced by the later
tracepoint.
Signed-off-by: Andrew Hall <hall@fb.com>
Signed-off-by: Matt Mullins <mmullins@fb.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/nbd.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 24cc10d1f0b4..3e6c3d5dadc8 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -513,6 +513,10 @@ static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index) if (sent) { if (sent >= sizeof(request)) { skip = sent - sizeof(request); + + /* initialize handle for tracing purposes */ + handle = nbd_cmd_handle(cmd); + goto send_pages; } iov_iter_advance(&from, sent); @@ -536,6 +540,7 @@ static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index) (unsigned long long)blk_rq_pos(req) << 9, blk_rq_bytes(req)); result = sock_xmit(nbd, index, 1, &from, (type == NBD_CMD_WRITE) ? MSG_MORE : 0, &sent); + trace_nbd_header_sent(req, handle); if (result <= 0) { if (was_interrupted(result)) { /* If we havne't sent anything we can just return BUSY, @@ -608,6 +613,7 @@ send_pages: bio = next; } out: + trace_nbd_payload_sent(req, handle); nsock->pending = NULL; nsock->sent = 0; return 0; @@ -655,6 +661,7 @@ static struct nbd_cmd *nbd_read_stat(struct nbd_device *nbd, int index) tag, req); return ERR_PTR(-ENOENT); } + trace_nbd_header_received(req, handle); cmd = blk_mq_rq_to_pdu(req); mutex_lock(&cmd->lock); @@ -708,6 +715,7 @@ static struct nbd_cmd *nbd_read_stat(struct nbd_device *nbd, int index) } } out: + trace_nbd_payload_received(req, handle); mutex_unlock(&cmd->lock); return ret ? ERR_PTR(ret) : cmd; } |