diff options
Diffstat (limited to 'init/Kconfig')
| -rw-r--r-- | init/Kconfig | 221 |
1 files changed, 109 insertions, 112 deletions
diff --git a/init/Kconfig b/init/Kconfig index 2081a4d3d917..b999fa381bf9 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -394,6 +394,7 @@ endchoice config BSD_PROCESS_ACCT bool "BSD Process Accounting" + depends on MULTIUSER help If you say Y here, a user level program will be able to instruct the kernel (via a special system call) to write process accounting @@ -420,6 +421,7 @@ config BSD_PROCESS_ACCT_V3 config TASKSTATS bool "Export task/process statistics through netlink" depends on NET + depends on MULTIUSER default n help Export selected statistics for tasks/processes through the @@ -463,24 +465,18 @@ endmenu # "CPU/Task time and stats accounting" menu "RCU Subsystem" -choice - prompt "RCU Implementation" - default TREE_RCU - config TREE_RCU - bool "Tree-based hierarchical RCU" - depends on !PREEMPT && SMP - select IRQ_WORK + bool + default y if !PREEMPT && SMP help This option selects the RCU implementation that is designed for very large SMP system with hundreds or thousands of CPUs. It also scales down nicely to smaller systems. -config TREE_PREEMPT_RCU - bool "Preemptible tree-based hierarchical RCU" - depends on PREEMPT - select IRQ_WORK +config PREEMPT_RCU + bool + default y if PREEMPT help This option selects the RCU implementation that is designed for very large SMP systems with hundreds or @@ -491,34 +487,47 @@ config TREE_PREEMPT_RCU Select this option if you are unsure. config TINY_RCU - bool "UP-only small-memory-footprint RCU" - depends on !PREEMPT && !SMP + bool + default y if !PREEMPT && !SMP help This option selects the RCU implementation that is designed for UP systems from which real-time response is not required. This option greatly reduces the memory footprint of RCU. -endchoice +config RCU_EXPERT + bool "Make expert-level adjustments to RCU configuration" + default n + help + This option needs to be enabled if you wish to make + expert-level adjustments to RCU configuration. By default, + no such adjustments can be made, which has the often-beneficial + side-effect of preventing "make oldconfig" from asking you all + sorts of detailed questions about how you would like numerous + obscure RCU options to be set up. -config PREEMPT_RCU - def_bool TREE_PREEMPT_RCU + Say Y if you need to make expert-level adjustments to RCU. + + Say N if you are unsure. + +config SRCU + bool help - This option enables preemptible-RCU code that is common between - TREE_PREEMPT_RCU and, in the old days, TINY_PREEMPT_RCU. + This option selects the sleepable version of RCU. This version + permits arbitrary sleeping or blocking within RCU read-side critical + sections. config TASKS_RCU - bool "Task_based RCU implementation using voluntary context switch" + bool default n + select SRCU help This option enables a task-based RCU implementation that uses only voluntary context switch (not preemption!), idle, and user-mode execution as quiescent states. - If unsure, say N. - config RCU_STALL_COMMON - def_bool ( TREE_RCU || TREE_PREEMPT_RCU || RCU_TRACE ) + def_bool ( TREE_RCU || PREEMPT_RCU || RCU_TRACE ) help This option enables RCU CPU stall code that is common between the TINY and TREE variants of RCU. The purpose is to allow @@ -529,9 +538,7 @@ config CONTEXT_TRACKING bool config RCU_USER_QS - bool "Consider userspace as in RCU extended quiescent state" - depends on HAVE_CONTEXT_TRACKING && SMP - select CONTEXT_TRACKING + bool help This option sets hooks on kernel / userspace boundaries and puts RCU in extended quiescent state when the CPU runs in @@ -539,12 +546,6 @@ config RCU_USER_QS excluded from the global RCU state machine and thus doesn't try to keep the timer tick on for RCU. - Unless you want to hack and help the development of the full - dynticks mode, you shouldn't enable this option. It also - adds unnecessary overhead. - - If unsure say N - config CONTEXT_TRACKING_FORCE bool "Force context tracking" depends on CONTEXT_TRACKING @@ -576,7 +577,7 @@ config RCU_FANOUT int "Tree-based hierarchical RCU fanout value" range 2 64 if 64BIT range 2 32 if !64BIT - depends on TREE_RCU || TREE_PREEMPT_RCU + depends on (TREE_RCU || PREEMPT_RCU) && RCU_EXPERT default 64 if 64BIT default 32 if !64BIT help @@ -594,9 +595,9 @@ config RCU_FANOUT config RCU_FANOUT_LEAF int "Tree-based hierarchical RCU leaf-level fanout value" - range 2 RCU_FANOUT if 64BIT - range 2 RCU_FANOUT if !64BIT - depends on TREE_RCU || TREE_PREEMPT_RCU + range 2 64 if 64BIT + range 2 32 if !64BIT + depends on (TREE_RCU || PREEMPT_RCU) && RCU_EXPERT default 16 help This option controls the leaf-level fanout of hierarchical @@ -619,23 +620,9 @@ config RCU_FANOUT_LEAF Take the default if unsure. -config RCU_FANOUT_EXACT - bool "Disable tree-based hierarchical RCU auto-balancing" - depends on TREE_RCU || TREE_PREEMPT_RCU - default n - help - This option forces use of the exact RCU_FANOUT value specified, - regardless of imbalances in the hierarchy. This is useful for - testing RCU itself, and might one day be useful on systems with - strong NUMA behavior. - - Without RCU_FANOUT_EXACT, the code will balance the hierarchy. - - Say N if unsure. - config RCU_FAST_NO_HZ bool "Accelerate last non-dyntick-idle CPU's grace periods" - depends on NO_HZ_COMMON && SMP + depends on NO_HZ_COMMON && SMP && RCU_EXPERT default n help This option permits CPUs to enter dynticks-idle state even if @@ -652,16 +639,16 @@ config RCU_FAST_NO_HZ Say N if you are unsure. config TREE_RCU_TRACE - def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU ) + def_bool RCU_TRACE && ( TREE_RCU || PREEMPT_RCU ) select DEBUG_FS help This option provides tracing for the TREE_RCU and - TREE_PREEMPT_RCU implementations, permitting Makefile to + PREEMPT_RCU implementations, permitting Makefile to trivially select kernel/rcutree_trace.c. config RCU_BOOST bool "Enable RCU priority boosting" - depends on RT_MUTEXES && PREEMPT_RCU + depends on RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT default n help This option boosts the priority of preempted RCU readers that @@ -672,30 +659,33 @@ config RCU_BOOST 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 long-term - preempted RCU readers are to be boosted. If you are working - with a real-time application that has one or more CPU-bound - threads running at a real-time priority level, you should set - RCU_BOOST_PRIO to a priority higher then the highest-priority - real-time CPU-bound thread. The default RCU_BOOST_PRIO value - of 1 is appropriate in the common case, which is real-time +config RCU_KTHREAD_PRIO + int "Real-time priority to use for RCU worker threads" + range 1 99 if RCU_BOOST + range 0 99 if !RCU_BOOST + default 1 if RCU_BOOST + default 0 if !RCU_BOOST + depends on RCU_EXPERT + help + This option specifies the SCHED_FIFO priority value that will be + assigned to the rcuc/n and rcub/n threads and is also the value + used for RCU_BOOST (if enabled). If you are working with a + real-time application that has one or more CPU-bound threads + running at a real-time priority level, you should set + RCU_KTHREAD_PRIO to a priority higher than the highest-priority + real-time CPU-bound application thread. The default RCU_KTHREAD_PRIO + value of 1 is appropriate in the common case, which is real-time applications that do not have any CPU-bound threads. Some real-time applications might not have a single real-time thread that saturates a given CPU, but instead might have multiple real-time threads that, taken together, fully utilize - that CPU. In this case, you should set RCU_BOOST_PRIO to + that CPU. In this case, you should set RCU_KTHREAD_PRIO to a priority higher than the lowest-priority thread that is conspiring to prevent the CPU from running any non-real-time tasks. For example, if one thread at priority 10 and another thread at priority 5 are between themselves fully consuming - the CPU time on a given CPU, then RCU_BOOST_PRIO should be + the CPU time on a given CPU, then RCU_KTHREAD_PRIO should be set to priority 6 or higher. Specify the real-time priority, or take the default if unsure. @@ -715,7 +705,7 @@ config RCU_BOOST_DELAY config RCU_NOCB_CPU bool "Offload RCU callback processing from boot-selected CPUs" - depends on TREE_RCU || TREE_PREEMPT_RCU + depends on TREE_RCU || PREEMPT_RCU default n help Use this option to reduce OS jitter for aggressive HPC or @@ -739,6 +729,7 @@ config RCU_NOCB_CPU choice prompt "Build-forced no-CBs CPUs" default RCU_NOCB_CPU_NONE + depends on RCU_NOCB_CPU help This option allows no-CBs CPUs (whose RCU callbacks are invoked from kthreads rather than from softirq context) to be specified @@ -747,7 +738,6 @@ choice config RCU_NOCB_CPU_NONE bool "No build_forced no-CBs CPUs" - depends on RCU_NOCB_CPU help This option does not force any of the CPUs to be no-CBs CPUs. Only CPUs designated by the rcu_nocbs= boot parameter will be @@ -761,7 +751,6 @@ config RCU_NOCB_CPU_NONE config RCU_NOCB_CPU_ZERO bool "CPU 0 is a build_forced no-CBs CPU" - depends on RCU_NOCB_CPU help This option forces CPU 0 to be a no-CBs CPU, so that its RCU callbacks are invoked by a per-CPU kthread whose name begins @@ -776,7 +765,6 @@ config RCU_NOCB_CPU_ZERO config RCU_NOCB_CPU_ALL bool "All CPUs are build_forced no-CBs CPUs" - depends on RCU_NOCB_CPU help This option forces all CPUs to be no-CBs CPUs. The rcu_nocbs= boot parameter will be ignored. All CPUs' RCU callbacks will @@ -791,6 +779,19 @@ config RCU_NOCB_CPU_ALL endchoice +config RCU_EXPEDITE_BOOT + bool + default n + help + This option enables expedited grace periods at boot time, + as if rcu_expedite_gp() had been invoked early in boot. + The corresponding rcu_unexpedite_gp() is invoked from + rcu_end_inkernel_boot(), which is intended to be invoked + at the end of the kernel-only boot sequence, just before + init is exec'ed. + + Accept the default if unsure. + endmenu # "RCU Subsystem" config BUILD_BIN2C @@ -900,14 +901,6 @@ config ARCH_SUPPORTS_INT128 config ARCH_WANT_NUMA_VARIABLE_LOCALITY bool -config NUMA_BALANCING_DEFAULT_ENABLED - bool "Automatically enable NUMA aware memory/task placement" - default y - depends on NUMA_BALANCING - help - If set, automatic NUMA balancing will be enabled if running on a NUMA - machine. - config NUMA_BALANCING bool "Memory placement aware NUMA scheduler" depends on ARCH_SUPPORTS_NUMA_BALANCING @@ -920,8 +913,16 @@ config NUMA_BALANCING This system will be inactive on UMA systems. +config NUMA_BALANCING_DEFAULT_ENABLED + bool "Automatically enable NUMA aware memory/task placement" + default y + depends on NUMA_BALANCING + help + If set, automatic NUMA balancing will be enabled if running on a NUMA + machine. + menuconfig CGROUPS - boolean "Control Group support" + bool "Control Group support" select KERNFS help This option adds support for grouping sets of processes together, for @@ -979,32 +980,17 @@ config CGROUP_CPUACCT Provides a simple Resource Controller for monitoring the total CPU consumed by the tasks in a cgroup. -config RESOURCE_COUNTERS - bool "Resource counters" - help - This option enables controller independent resource accounting - infrastructure that works with cgroups. +config PAGE_COUNTER + bool config MEMCG bool "Memory Resource Controller for Control Groups" - depends on RESOURCE_COUNTERS + select PAGE_COUNTER select EVENTFD help Provides a memory resource controller that manages both anonymous memory and page cache. (See Documentation/cgroups/memory.txt) - Note that setting this option increases fixed memory overhead - associated with each page of memory in the system. By this, - 8(16)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory - usage tracking struct at boot. Total amount of this is printed out - at boot. - - Only enable when you're ok with these trade offs and really - sure you need the memory resource controller. Even when you enable - this, you can set "cgroup_disable=memory" at your boot option to - disable memory resource controller and you can avoid overheads. - (and lose benefits of memory resource controller) - config MEMCG_SWAP bool "Memory Resource Controller Swap Extension" depends on MEMCG && SWAP @@ -1047,15 +1033,10 @@ config MEMCG_KMEM the kmem extension can use it to guarantee that no group of processes will ever exhaust kernel resources alone. - WARNING: Current implementation lacks reclaim support. That means - allocation attempts will fail when close to the limit even if there - are plenty of kmem available for reclaim. That makes this option - unusable in real life so DO NOT SELECT IT unless for development - purposes. - config CGROUP_HUGETLB bool "HugeTLB Resource Controller for Control Groups" - depends on RESOURCE_COUNTERS && HUGETLB_PAGE + depends on HUGETLB_PAGE + select PAGE_COUNTER default n help Provides a cgroup Resource Controller for HugeTLB pages. @@ -1161,6 +1142,7 @@ config CHECKPOINT_RESTORE menuconfig NAMESPACES bool "Namespaces support" if EXPERT + depends on MULTIUSER default !EXPERT help Provides the way to make tasks work with different objects using @@ -1304,8 +1286,8 @@ endif config CC_OPTIMIZE_FOR_SIZE bool "Optimize for size" help - Enabling this option will pass "-Os" instead of "-O2" to gcc - resulting in a smaller kernel. + Enabling this option will pass "-Os" instead of "-O2" to + your compiler resulting in a smaller kernel. If unsure, say N. @@ -1357,11 +1339,25 @@ menuconfig EXPERT config UID16 bool "Enable 16-bit UID system calls" if EXPERT - depends on HAVE_UID16 + depends on HAVE_UID16 && MULTIUSER default y help This enables the legacy 16-bit UID syscall wrappers. +config MULTIUSER + bool "Multiple users, groups and capabilities support" if EXPERT + default y + help + This option enables support for non-root users, groups and + capabilities. + + If you say N here, all processes will run with UID 0, GID 0, and all + possible capabilities. Saying N here also compiles out support for + system calls related to UIDs, GIDs, and capabilities, such as setuid, + setgid, and capset. + + If unsure, say Y here. + config SGETMASK_SYSCALL bool "sgetmask/ssetmask syscalls support" if EXPERT def_bool PARISC || MN10300 || BLACKFIN || M68K || PPC || MIPS || X86 || SPARC || CRIS || MICROBLAZE || SUPERH @@ -1527,7 +1523,7 @@ config EVENTFD # syscall, maps, verifier config BPF_SYSCALL - bool "Enable bpf() system call" if EXPERT + bool "Enable bpf() system call" select ANON_INODES select BPF default n @@ -1600,6 +1596,7 @@ config PERF_EVENTS depends on HAVE_PERF_EVENTS select ANON_INODES select IRQ_WORK + select SRCU help Enable kernel support for various performance events provided by software and hardware. @@ -1626,7 +1623,7 @@ config PERF_EVENTS config DEBUG_PERF_USE_VMALLOC default n bool "Debug: use vmalloc to back perf mmap() buffers" - depends on PERF_EVENTS && DEBUG_KERNEL + depends on PERF_EVENTS && DEBUG_KERNEL && !PPC select PERF_USE_VMALLOC help Use vmalloc memory to back perf mmap() buffers. @@ -1775,7 +1772,7 @@ config SLABINFO default y config RT_MUTEXES - boolean + bool config BASE_SMALL int |