K(ret)probe for TCP time to connect?

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I'm working on instrumenting a TCP connections to assist in making
load balancing decisions elsewhere. Specifically, I'm looking to get
statistics for the time to connect, and notification of failed
connects. I initially tried to put kretprobes around
inet_stream_connect, but if the socket is in non-blocking mode that
notification happens asynchronously. I can't figure out a (good) way
to keep track of this data. Any suggestions?

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