On Mon, 26 Nov 2018 18:49:19 -0800 Trip Volpe <trip.volpe@xxxxxxxxx> wrote: > Hey all; I'm trying to use `perf record` to get detailed information > about user page faults, including the addresses at which the faults > occurred. I've done this before with, e.g., `perf record -e > exceptions:page_fault_user -p 12345 sleep 1`. > > However, on the system I'm examining now, I just get an "unknown > tracepoint" error. I checked > /sys/kernel/debug/tracing/events/exceptions, and sure enough, that I'm guessing that debugfs is mounted. What other event systems are there? # ls /sys/kernel/debug/tracing/event What does the above produce? -- Steve > path does not exist. Does anybody happen to know under what > circumstances these tracepoints could be disabled or omitted? I've > looked through the kconfigs and sysctls for anything that might seem > relevant but have had no luck so far. > > I'm running Ubuntu 16.04 with kernel 4.13 on a dual Xeon Gold 6126 system. > > # uname -a > Linux test 4.13.0-37-generic #42~16.04.1 SMP Sat May 12 06:21:13 UTC > 2018 x86_64 x86_64 x86_64 GNU/Linux > > My kernel config is here: https://pastebin.com/raw/A62FDFd6 > > Any help or pointers would be greatly appreciated!
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