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authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>2017-08-20 14:39:20 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-08-22 13:24:54 -0300
commitac0bb6b72f4bbab08f270a919406d971e73698b5 (patch)
tree4d287b876d31e0e4cb27401bc222aee61e177fb7 /Documentation/sysctl
parent2826478a6660158d261bc49ad8954a8f5c39be07 (diff)
downloadlinux-ac0bb6b72f4bbab08f270a919406d971e73698b5.tar.bz2
perf: Fix documentation for sysctls perf_event_paranoid and perf_event_mlock_kb
Fix misprint CAP_IOC_LOCK -> CAP_IPC_LOCK. This capability have nothing to do with raw tracepoints. This part is about bypassing mlock limits. Sysctl kernel.perf_event_paranoid = -1 allows raw and ftrace function tracepoints without CAP_SYS_ADMIN. Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/150322916080.129746.11285255474738558340.stgit@buzz Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'Documentation/sysctl')
-rw-r--r--Documentation/sysctl/kernel.txt13
1 files changed, 12 insertions, 1 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index bac23c198360..ce61d1fe08ca 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -61,6 +61,7 @@ show up in /proc/sys/kernel:
- perf_cpu_time_max_percent
- perf_event_paranoid
- perf_event_max_stack
+- perf_event_mlock_kb
- perf_event_max_contexts_per_stack
- pid_max
- powersave-nap [ PPC only ]
@@ -654,7 +655,9 @@ Controls use of the performance events system by unprivileged
users (without CAP_SYS_ADMIN). The default value is 2.
-1: Allow use of (almost) all events by all users
->=0: Disallow raw tracepoint access by users without CAP_IOC_LOCK
+ Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK
+>=0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN
+ Disallow raw tracepoint access by users without CAP_SYS_ADMIN
>=1: Disallow CPU event access by users without CAP_SYS_ADMIN
>=2: Disallow kernel profiling by users without CAP_SYS_ADMIN
@@ -673,6 +676,14 @@ The default value is 127.
==============================================================
+perf_event_mlock_kb:
+
+Control size of per-cpu ring buffer not counted agains mlock limit.
+
+The default value is 512 + 1 page
+
+==============================================================
+
perf_event_max_contexts_per_stack:
Controls maximum number of stack frame context entries for