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| author | Linux Build Service Account <lnxbuild@localhost> | 2016-09-19 23:27:57 -0700 |
|---|---|---|
| committer | Gerrit - the friendly Code Review server <code-review@localhost> | 2016-09-19 23:27:57 -0700 |
| commit | f6ee052d8011b249e34d782e018bfa222b78a8e3 (patch) | |
| tree | 9b4bf673aa168bb0ae044c072c83be177f082c79 /Documentation | |
| parent | 646ce8a9057216bc2daed8cb5618096ca5e95dce (diff) | |
| parent | a647f40d2b02cbc0456037de049d4d9e53083420 (diff) | |
Merge "BACKPORT: perf tools: Document the perf sysctls"
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/sysctl/kernel.txt | 38 |
1 files changed, 25 insertions, 13 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index 9c48b84660f5..8ddf95ff9a9f 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -60,6 +60,7 @@ show up in /proc/sys/kernel: - panic_on_stackoverflow - panic_on_unrecovered_nmi - panic_on_warn +- perf_event_paranoid - pid_max - powersave-nap [ PPC only ] - printk @@ -599,19 +600,6 @@ This file shows up if CONFIG_DEBUG_STACKOVERFLOW is enabled. ============================================================== -panic_on_unrecovered_nmi: - -The default Linux behaviour on an NMI of either memory or unknown is -to continue operation. For many environments such as scientific -computing it is preferable that the box is taken out and the error -dealt with than an uncorrected parity/ECC error get propagated. - -A small number of systems do generate NMI's for bizarre random reasons -such as power management so the default is off. That sysctl works like -the existing panic controls already in that directory. - -============================================================== - panic_on_warn: Calls panic() in the WARN() path when set to 1. This is useful to avoid @@ -649,6 +637,30 @@ allowed to execute. ============================================================== +panic_on_unrecovered_nmi: + +The default Linux behaviour on an NMI of either memory or unknown is +to continue operation. For many environments such as scientific +computing it is preferable that the box is taken out and the error +dealt with than an uncorrected parity/ECC error get propagated. + +A small number of systems do generate NMI's for bizarre random reasons +such as power management so the default is off. That sysctl works like +the existing panic controls already in that directory. + +============================================================== + +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: |