linux-stable/Documentation/trace/events-msr.rst
Alexander A. Klimov 93431e0607 Replace HTTP links with HTTPS ones: documentation
Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  For each line:
    If doesn't contain `\bxmlns\b`:
      For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
        If both the HTTP and HTTPS versions
        return 200 OK and serve the same content:
          Replace HTTP with HTTPS.

Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de>
Link: https://lore.kernel.org/r/20200526060544.25127-1-grandmaster@al2klimov.de
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2020-06-08 09:30:19 -06:00

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================
MSR Trace Events
================
The x86 kernel supports tracing most MSR (Model Specific Register) accesses.
To see the definition of the MSRs on Intel systems please see the SDM
at https://www.intel.com/sdm (Volume 3)
Available trace points:
/sys/kernel/debug/tracing/events/msr/
Trace MSR reads:
read_msr
- msr: MSR number
- val: Value written
- failed: 1 if the access failed, otherwise 0
Trace MSR writes:
write_msr
- msr: MSR number
- val: Value written
- failed: 1 if the access failed, otherwise 0
Trace RDPMC in kernel:
rdpmc
The trace data can be post processed with the postprocess/decode_msr.py script::
cat /sys/kernel/debug/tracing/trace | decode_msr.py /usr/src/linux/include/asm/msr-index.h
to add symbolic MSR names.