BACKPORT: perf tools: Document the perf sysctls

perf_event_paranoid was only documented in source code and a perf error
message.  Copy the documentation from the error message to

perf_cpu_time_max_percent was already documented but missing from the
list at the top, so add it there.

Signed-off-by: Ben Hutchings <>
Cc: Peter Zijlstra <>
[ Remove reference to external Documentation file, provide info inline, as before ]
Signed-off-by: Arnaldo Carvalho de Melo <>

Bug: 29054680
Patchset: perf-lockdown

(backported from 3379e0c3effa87d7734fc06277a7023292aadb0c)
Signed-off-by: Mattias Nissler <>

Change-Id: I0373a15cfa0aae9123570af7095994b5cf8cd9ef
2 files changed