X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=init%2FKconfig;h=9e03ef8b311ec303b7fd1f70cc21021620100171;hb=83daee06adeed7b294802c998d5e03ea7d856aa1;hp=aef16f9b3d2384cb1865733964c09e51d1248a63;hpb=8dc8e5e8bc0ce00b0f656bf972f67cd8a72759e5;p=safe%2Fjmp%2Flinux-2.6 diff --git a/init/Kconfig b/init/Kconfig index aef16f9..9e03ef8 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -16,6 +16,11 @@ config DEFCONFIG_LIST default "$ARCH_DEFCONFIG" default "arch/$ARCH/defconfig" +config CONSTRUCTORS + bool + depends on !UML + default y + menu "General setup" config EXPERIMENTAL @@ -292,7 +297,7 @@ config AUDIT config AUDITSYSCALL bool "Enable system-call auditing support" - depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH) + depends on AUDIT && (X86 || PPC || S390 || IA64 || UML || SPARC64 || SUPERH) default y if SECURITY_SELINUX help Enable low-overhead system-call auditing infrastructure that @@ -302,46 +307,38 @@ config AUDITSYSCALL config AUDIT_TREE def_bool y - depends on AUDITSYSCALL && INOTIFY + depends on AUDITSYSCALL + select INOTIFY menu "RCU Subsystem" choice prompt "RCU Implementation" - default CLASSIC_RCU - -config CLASSIC_RCU - bool "Classic RCU" - help - This option selects the classic RCU implementation that is - designed for best read-side performance on non-realtime - systems. - - Select this option if you are unsure. + default TREE_RCU config TREE_RCU bool "Tree-based hierarchical RCU" help This option selects the RCU implementation that is designed for very large SMP system with hundreds or - thousands of CPUs. + thousands of CPUs. It also scales down nicely to + smaller systems. -config PREEMPT_RCU - bool "Preemptible RCU" +config TREE_PREEMPT_RCU + bool "Preemptable tree-based hierarchical RCU" depends on PREEMPT help - This option reduces the latency of the kernel by making certain - RCU sections preemptible. Normally RCU code is non-preemptible, if - this option is selected then read-only RCU sections become - preemptible. This helps latency, but may expose bugs due to - now-naive assumptions about each RCU read-side critical section - remaining on a given CPU through its execution. + This option selects the RCU implementation that is + designed for very large SMP systems with hundreds or + thousands of CPUs, but for which real-time response + is also required. It also scales down nicely to + smaller systems. endchoice config RCU_TRACE bool "Enable tracing for RCU" - depends on TREE_RCU || PREEMPT_RCU + depends on TREE_RCU || TREE_PREEMPT_RCU help This option provides tracing in RCU which presents stats in debugfs for debugging RCU implementation. @@ -353,7 +350,7 @@ config RCU_FANOUT int "Tree-based hierarchical RCU fanout value" range 2 64 if 64BIT range 2 32 if !64BIT - depends on TREE_RCU + depends on TREE_RCU || TREE_PREEMPT_RCU default 64 if 64BIT default 32 if !64BIT help @@ -368,7 +365,7 @@ config RCU_FANOUT config RCU_FANOUT_EXACT bool "Disable tree-based hierarchical RCU auto-balancing" - depends on TREE_RCU + depends on TREE_RCU || TREE_PREEMPT_RCU default n help This option forces use of the exact RCU_FANOUT value specified, @@ -381,18 +378,12 @@ config RCU_FANOUT_EXACT Say N if unsure. config TREE_RCU_TRACE - def_bool RCU_TRACE && TREE_RCU + def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU ) select DEBUG_FS help - This option provides tracing for the TREE_RCU implementation, - permitting Makefile to trivially select kernel/rcutree_trace.c. - -config PREEMPT_RCU_TRACE - def_bool RCU_TRACE && PREEMPT_RCU - select DEBUG_FS - help - This option provides tracing for the PREEMPT_RCU implementation, - permitting Makefile to trivially select kernel/rcupreempt_trace.c. + This option provides tracing for the TREE_RCU and + TREE_PREEMPT_RCU implementations, permitting Makefile to + trivially select kernel/rcutree_trace.c. endmenu # "RCU Subsystem" @@ -615,13 +606,13 @@ config SYSFS_DEPRECATED bool config SYSFS_DEPRECATED_V2 - bool "Create deprecated sysfs layout for older userspace tools" + bool "remove sysfs features which may confuse old userspace tools" depends on SYSFS - default y + default n select SYSFS_DEPRECATED help This option switches the layout of sysfs to the deprecated - version. + version. Do not use it on recent distributions. The current sysfs layout features a unified device tree at /sys/devices/, which is able to express a hierarchy between @@ -808,14 +799,6 @@ config KALLSYMS_EXTRA_PASS you wait for kallsyms to be fixed. -config STRIP_ASM_SYMS - bool "Strip assembler-generated symbols during link" - default n - help - Strip internal assembler-generated symbols during a link (symbols - that look like '.Lxxx') so they don't pollute the output of - get_wchan() and suchlike. - config HOTPLUG bool "Support for hot-pluggable devices" if EMBEDDED default y @@ -933,37 +916,83 @@ config AIO by some high performance threaded applications. Disabling this option saves about 7k. -config HAVE_PERF_COUNTERS +config HAVE_PERF_EVENTS bool + help + See tools/perf/design.txt for details. -menu "Performance Counters" +config PERF_USE_VMALLOC + bool + help + See tools/perf/design.txt for details -config PERF_COUNTERS - bool "Kernel Performance Counters" - depends on HAVE_PERF_COUNTERS +menu "Kernel Performance Events And Counters" + +config PERF_EVENTS + bool "Kernel performance events and counters" + default y if (PROFILING || PERF_COUNTERS) + depends on HAVE_PERF_EVENTS select ANON_INODES help - Enable kernel support for performance counter hardware. + Enable kernel support for various performance events provided + by software and hardware. + + Software events are supported either built-in or via the + use of generic tracepoints. - Performance counters are special hardware registers available - on most modern CPUs. These registers count the number of certain + Most modern CPUs support performance events via performance + counter registers. These registers count the number of certain types of hw events: such as instructions executed, cachemisses suffered, or branches mis-predicted - without slowing down the kernel or applications. These registers can also trigger interrupts when a threshold number of events have passed - and can thus be used to profile the code that runs on that CPU. - The Linux Performance Counter subsystem provides an abstraction of - these hardware capabilities, available via a system call. It + The Linux Performance Event subsystem provides an abstraction of + these software and hardware event capabilities, available via a + system call and used by the "perf" utility in tools/perf/. It provides per task and per CPU counters, and it provides event capabilities on top of those. Say Y if unsure. config EVENT_PROFILE - bool "Tracepoint profile sources" - depends on PERF_COUNTERS && EVENT_TRACER + bool "Tracepoint profiling sources" + depends on PERF_EVENTS && EVENT_TRACING default y + help + Allow the use of tracepoints as software performance events. + + When this is enabled, you can create perf events based on + tracepoints using PERF_TYPE_TRACEPOINT and the tracepoint ID + found in debugfs://tracing/events/*/*/id. (The -e/--events + option to the perf tool can parse and interpret symbolic + tracepoints, in the subsystem:tracepoint_name format.) + +config PERF_COUNTERS + bool "Kernel performance counters (old config option)" + depends on HAVE_PERF_EVENTS + help + This config has been obsoleted by the PERF_EVENTS + config option - please see that one for details. + + It has no effect on the kernel whether you enable + it or not, it is a compatibility placeholder. + + Say N if unsure. + +config DEBUG_PERF_USE_VMALLOC + default n + bool "Debug: use vmalloc to back perf mmap() buffers" + depends on PERF_EVENTS && DEBUG_KERNEL + select PERF_USE_VMALLOC + help + Use vmalloc memory to back perf mmap() buffers. + + Mostly useful for debugging the vmalloc code on platforms + that don't require it. + + Say N if unsure. endmenu @@ -1053,13 +1082,6 @@ config PROFILING config TRACEPOINTS bool -config MARKERS - bool "Activate markers" - select TRACEPOINTS - help - Place an empty function call at each marker site. Can be - dynamically changed for a probe function. - source "arch/Kconfig" config SLOW_WORK