Find out which task is generating a lot of context switches on linux
The 't' option shows the threads also. It might be a thread who is doing the context switches .
Well, quite interesting case. Try observing
watch -tdn1 cat /proc/interrupts. Do you see any valuable changes there?
In newer kernel version
sudo perf record -e context-switches -a # record the events
# then ctrl+c
sudo perf report # inspect the result
This will give you the exactly result about context-switches events.
And you may be find the reason caused the context-switches by append "-g" flags (The readable result determined by symbol information)
sudo perf record -e context-switches -a -g