kernel/include/trace/events/nbd.h, branch linux-5.2.y

nbd: add tracepoints for send/receive timing

2019-04-27T02:04:19Z

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 Signed-off-by: Matt Mullins Reviewed-by: Josef Bacik Signed-off-by: Alexei Starovoitov

nbd: trace sending nbd requests

2019-04-27T02:04:19Z

This adds a tracepoint that can both observe the nbd request being sent to the server, as well as modify that request , e.g., setting a flag in the request that will cause the server to collect detailed tracing data. The struct request * being handled is included to permit correlation with the block tracepoints. Signed-off-by: Matt Mullins Reviewed-by: Josef Bacik Signed-off-by: Alexei Starovoitov