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perf tools: Document the perf sysctls

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perf_event_paranoid was only documented in source code and a perf error
message.  Copy the documentation from the error message to
Documentation/sysctl/kernel.txt.

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 <ben@decadent.org.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-doc@vger.kernel.org
Link: http://lkml.kernel.org/r/20160119213515.GG2637@decadent.org.uk
[ Remove reference to external Documentation file, provide info inline, as before ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ben Hutchings 2016-01-19 21:35:15 +00:00 • committed by Arnaldo Carvalho de Melo
parent 1f7c254132
commit 3379e0c3ef
2 changed files with 22 additions and 6 deletions
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13
Documentation/sysctl/kernel.txt
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@ -58,6 +58,8 @@ show up in /proc/sys/kernel:
- panic_on_stackoverflow
- panic_on_unrecovered_nmi
- panic_on_warn
- perf_cpu_time_max_percent
- perf_event_paranoid
- pid_max
- powersave-nap [ PPC only ]
- printk
@ -639,6 +641,17 @@ allowed to execute.
==============================================================
perf_event_paranoid:
Controls use of the performance events system by unprivileged
users (without CAP_SYS_ADMIN). The default value is 1.
-1: Allow use of (almost) all events by all users
>=0: Disallow raw tracepoint access by users without CAP_IOC_LOCK
>=1: Disallow CPU event access by users without CAP_SYS_ADMIN
>=2: Disallow kernel profiling by users without CAP_SYS_ADMIN
==============================================================
pid_max: