diff options
| author | Ben Hutchings <ben@decadent.org.uk> | 2016-01-19 21:35:15 +0000 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2016-09-10 15:04:41 +0200 |
| commit | 92d745ec71fa18beeff5a9c8bda5f2183b910ce2 (patch) | |
| tree | 7515493e47504394c942cb506a6f7c7e08034b9d /tools/perf | |
| parent | 3333eb9da4a3970255dec1ca52fa43fd4663397e (diff) | |
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
Documentation/sysctl/kernel.txt.
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>
Bug: 29054680
Change-Id: I13e73cfb2ad761c94762d0c8196df7725abdf5c5
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/util/evsel.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 63b6f8c8e..54494df33 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1515,12 +1515,15 @@ int perf_evsel__open_strerror(struct perf_evsel *evsel, 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.", |