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
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>

2 files changed, 22 insertions, 6 deletions

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 73c6b1ef0e84..c803e7300f0b 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -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:
 
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index cdbaf9b51e42..467808680ee4 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2362,12 +2362,15 @@ int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
         case EPERM:
         case EACCES:
                 return scnprintf(msg, size,
-                 "You may not have permission to collect %sstats.\n"
-                 "Consider tweaking /proc/sys/kernel/perf_event_paranoid:\n"
-                 " -1 - Not paranoid at all\n"
-                 "  0 - Disallow raw tracepoint access for unpriv\n"
-                 "  1 - Disallow cpu events for unpriv\n"
-                 "  2 - Disallow kernel profiling for unpriv",
+                 "You may not have permission to collect %sstats.\n\n"
+                 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
+                 "which controls use of the performance events system by\n"
+                 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
+                 "The default value is 1:\n\n"
+                 "  -1: Allow use of (almost) all events by all users\n"
+                 ">= 0: Disallow raw tracepoint access by users without CAP_IOC_LOCK\n"
+                 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
+                 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN",
                                  target->system_wide ? "system-wide " : "");
         case ENOENT:
                 return scnprintf(msg, size, "The %s event is not supported.",