diff options
Diffstat (limited to 'Documentation/sysctl/kernel.txt')
| -rw-r--r-- | Documentation/sysctl/kernel.txt | 51 |
1 files changed, 23 insertions, 28 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index 45542afe7..6fccb69c0 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -38,7 +38,6 @@ show up in /proc/sys/kernel: - hung_task_timeout_secs - hung_task_warnings - kexec_load_disabled -- iso_cpu - kptr_restrict - kstack_depth_to_print [ X86 only ] - l2cr [ PPC only ] @@ -67,7 +66,6 @@ show up in /proc/sys/kernel: - randomize_va_space - real-root-dev ==> Documentation/initrd.txt - reboot-cmd [ SPARC only ] -- rr_interval - rtsig-max - rtsig-nr - sem @@ -199,8 +197,8 @@ core_pattern is used to specify a core dumpfile pattern name. %P global pid (init PID namespace) %i tid %I global tid (init PID namespace) - %u uid - %g gid + %u uid (in initial user namespace) + %g gid (in initial user namespace) %d dump mode, matches PR_SET_DUMPABLE and /proc/sys/fs/suid_dumpable %s signal number @@ -386,16 +384,6 @@ kernel stack. ============================================================== -iso_cpu: (BFS CPU scheduler only). - -This sets the percentage cpu that the unprivileged SCHED_ISO tasks can -run effectively at realtime priority, averaged over a rolling five -seconds over the -whole- system, meaning all cpus. - -Set to 70 (percent) by default. - -============================================================== - l2cr: (PPC only) This flag controls the L2 cache of G3 processor boards. If @@ -735,20 +723,6 @@ rebooting. ??? ============================================================== -rr_interval: (BFS CPU scheduler only) - -This is the smallest duration that any cpu process scheduling unit -will run for. Increasing this value can increase throughput of cpu -bound tasks substantially but at the expense of increased latencies -overall. Conversely decreasing it will decrease average and maximum -latencies but at the expense of throughput. This value is in -milliseconds and the default value chosen depends on the number of -cpus available at scheduler initialisation with a minimum of 6. - -Valid values are from 1-1000. - -============================================================== - rtsig-max & rtsig-nr: The file rtsig-max can be used to tune the maximum number @@ -949,6 +923,27 @@ and nmi_watchdog. ============================================================== +watchdog_cpumask: + +This value can be used to control on which cpus the watchdog may run. +The default cpumask is all possible cores, but if NO_HZ_FULL is +enabled in the kernel config, and cores are specified with the +nohz_full= boot argument, those cores are excluded by default. +Offline cores can be included in this mask, and if the core is later +brought online, the watchdog will be started based on the mask value. + +Typically this value would only be touched in the nohz_full case +to re-enable cores that by default were not running the watchdog, +if a kernel lockup was suspected on those cores. + +The argument value is the standard cpulist format for cpumasks, +so for example to enable the watchdog on cores 0, 2, 3, and 4 you +might say: + + echo 0,2-4 > /proc/sys/kernel/watchdog_cpumask + +============================================================== + watchdog_thresh: This value can be used to control the frequency of hrtimer and NMI |