I cannot find any documentation on the kflushd such as what it does exactly, how it is involved in network IO and how I could use it/call it from my own code.
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kflushd AFAIK handles writing out pending I/O in memory to their corresponding devices. If you want to flush pending I/O’s you can always call flush, fflush, or sync to force a write to the I/O device.
To call it from your code simply use one of the calls I mentioned (although I think there might be one more I’m forgetting).