diff options
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 68 | ||||
| -rw-r--r-- | init/do_mounts.c | 2 | ||||
| -rw-r--r-- | init/main.c | 5 |
3 files changed, 72 insertions, 3 deletions
diff --git a/init/Kconfig b/init/Kconfig index c9728992a77..8dfd094e687 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -393,7 +393,6 @@ config PREEMPT_RCU config RCU_TRACE bool "Enable tracing for RCU" - depends on TREE_RCU || TREE_PREEMPT_RCU help This option provides tracing in RCU which presents stats in debugfs for debugging RCU implementation. @@ -459,6 +458,60 @@ config TREE_RCU_TRACE TREE_PREEMPT_RCU implementations, permitting Makefile to trivially select kernel/rcutree_trace.c. +config RCU_BOOST + bool "Enable RCU priority boosting" + depends on RT_MUTEXES && TINY_PREEMPT_RCU + default n + help + This option boosts the priority of preempted RCU readers that + block the current preemptible RCU grace period for too long. + This option also prevents heavy loads from blocking RCU + callback invocation for all flavors of RCU. + + Say Y here if you are working with real-time apps or heavy loads + Say N here if you are unsure. + +config RCU_BOOST_PRIO + int "Real-time priority to boost RCU readers to" + range 1 99 + depends on RCU_BOOST + default 1 + help + This option specifies the real-time priority to which preempted + RCU readers are to be boosted. If you are working with CPU-bound + real-time applications, you should specify a priority higher then + the highest-priority CPU-bound application. + + Specify the real-time priority, or take the default if unsure. + +config RCU_BOOST_DELAY + int "Milliseconds to delay boosting after RCU grace-period start" + range 0 3000 + depends on RCU_BOOST + default 500 + help + This option specifies the time to wait after the beginning of + a given grace period before priority-boosting preempted RCU + readers blocking that grace period. Note that any RCU reader + blocking an expedited RCU grace period is boosted immediately. + + Accept the default if unsure. + +config SRCU_SYNCHRONIZE_DELAY + int "Microseconds to delay before waiting for readers" + range 0 20 + default 10 + help + This option controls how long SRCU delays before entering its + loop waiting on SRCU readers. The purpose of this loop is + to avoid the unconditional context-switch penalty that would + otherwise be incurred if there was an active SRCU reader, + in a manner similar to adaptive locking schemes. This should + be set to be a bit longer than the common-case SRCU read-side + critical-section overhead. + + Accept the default if unsure. + endmenu # "RCU Subsystem" config IKCONFIG @@ -741,6 +794,19 @@ config NET_NS endif # NAMESPACES +config SCHED_AUTOGROUP + bool "Automatic process group scheduling" + select EVENTFD + select CGROUPS + select CGROUP_SCHED + select FAIR_GROUP_SCHED + help + This option optimizes the scheduler for common desktop workloads by + automatically creating and populating task groups. This separation + of workloads isolates aggressive CPU burners (like build jobs) from + desktop applications. Task group autogeneration is currently based + upon task session. + config MM_OWNER bool diff --git a/init/do_mounts.c b/init/do_mounts.c index 830aaec9c7d..2b54bef33b5 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -93,7 +93,7 @@ no_match: * * Returns the matching dev_t on success or 0 on failure. */ -static dev_t __init devt_from_partuuid(char *uuid_str) +static dev_t devt_from_partuuid(char *uuid_str) { dev_t res = 0; struct device *dev = NULL; diff --git a/init/main.c b/init/main.c index 5421e8f1628..00799c1d462 100644 --- a/init/main.c +++ b/init/main.c @@ -67,6 +67,7 @@ #include <linux/sfi.h> #include <linux/shmem_fs.h> #include <linux/slab.h> +#include <linux/perf_event.h> #include <asm/io.h> #include <asm/bugs.h> @@ -603,6 +604,8 @@ asmlinkage void __init start_kernel(void) "enabled *very* early, fixing it\n"); local_irq_disable(); } + idr_init_cache(); + perf_event_init(); rcu_init(); radix_tree_init(); /* init some links before init_ISA_irqs() */ @@ -658,7 +661,6 @@ asmlinkage void __init start_kernel(void) enable_debug_pagealloc(); kmemleak_init(); debug_objects_mem_init(); - idr_init_cache(); setup_per_cpu_pageset(); numa_policy_init(); if (late_time_init) @@ -879,6 +881,7 @@ static int __init kernel_init(void * unused) smp_prepare_cpus(setup_max_cpus); do_pre_smp_initcalls(); + lockup_detector_init(); smp_init(); sched_init_smp(); |