Re: Missing exceptions:page_fault_user event?

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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

 # 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:
> Any help or pointers would be greatly appreciated!

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