| # | |
| # General architecture dependent options | |
| # | |
| config OPROFILE | |
| tristate "OProfile system profiling" | |
| depends on PROFILING | |
| depends on HAVE_OPROFILE | |
| select RING_BUFFER | |
| select RING_BUFFER_ALLOW_SWAP | |
| help | |
| OProfile is a profiling system capable of profiling the | |
| whole system, include the kernel, kernel modules, libraries, | |
| and applications. | |
| If unsure, say N. | |
| config OPROFILE_EVENT_MULTIPLEX | |
| bool "OProfile multiplexing support (EXPERIMENTAL)" | |
| default n | |
| depends on OPROFILE && X86 | |
| help | |
| The number of hardware counters is limited. The multiplexing | |
| feature enables OProfile to gather more events than counters | |
| are provided by the hardware. This is realized by switching | |
| between events at an user specified time interval. | |
| If unsure, say N. | |
| config HAVE_OPROFILE | |
| bool | |
| config OPROFILE_NMI_TIMER | |
| def_bool y | |
| depends on PERF_EVENTS && HAVE_PERF_EVENTS_NMI | |
| config KPROBES | |
| bool "Kprobes" | |
| depends on MODULES | |
| depends on HAVE_KPROBES | |
| select KALLSYMS | |
| help | |
| Kprobes allows you to trap at almost any kernel address and | |
| execute a callback function. register_kprobe() establishes | |
| a probepoint and specifies the callback. Kprobes is useful | |
| for kernel debugging, non-intrusive instrumentation and testing. | |
| If in doubt, say "N". | |
| config JUMP_LABEL | |
| bool "Optimize trace point call sites" | |
| depends on HAVE_ARCH_JUMP_LABEL | |
| help | |
| If it is detected that the compiler has support for "asm goto", | |
| the kernel will compile trace point locations with just a | |
| nop instruction. When trace points are enabled, the nop will | |
| be converted to a jump to the trace function. This technique | |
| lowers overhead and stress on the branch prediction of the | |
| processor. | |
| On i386, options added to the compiler flags may increase | |
| the size of the kernel slightly. | |
| config OPTPROBES | |
| def_bool y | |
| depends on KPROBES && HAVE_OPTPROBES | |
| depends on !PREEMPT | |
| config HAVE_EFFICIENT_UNALIGNED_ACCESS | |
| bool | |
| help | |
| Some architectures are unable to perform unaligned accesses | |
| without the use of get_unaligned/put_unaligned. Others are | |
| unable to perform such accesses efficiently (e.g. trap on | |
| unaligned access and require fixing it up in the exception | |
| handler.) | |
| This symbol should be selected by an architecture if it can | |
| perform unaligned accesses efficiently to allow different | |
| code paths to be selected for these cases. Some network | |
| drivers, for example, could opt to not fix up alignment | |
| problems with received packets if doing so would not help | |
| much. | |
| See Documentation/unaligned-memory-access.txt for more | |
| information on the topic of unaligned memory accesses. | |
| config HAVE_SYSCALL_WRAPPERS | |
| bool | |
| config KRETPROBES | |
| def_bool y | |
| depends on KPROBES && HAVE_KRETPROBES | |
| config USER_RETURN_NOTIFIER | |
| bool | |
| depends on HAVE_USER_RETURN_NOTIFIER | |
| help | |
| Provide a kernel-internal notification when a cpu is about to | |
| switch to user mode. | |
| config HAVE_IOREMAP_PROT | |
| bool | |
| config HAVE_KPROBES | |
| bool | |
| config HAVE_KRETPROBES | |
| bool | |
| config HAVE_OPTPROBES | |
| bool | |
| # | |
| # An arch should select this if it provides all these things: | |
| # | |
| # task_pt_regs() in asm/processor.h or asm/ptrace.h | |
| # arch_has_single_step() if there is hardware single-step support | |
| # arch_has_block_step() if there is hardware block-step support | |
| # asm/syscall.h supplying asm-generic/syscall.h interface | |
| # linux/regset.h user_regset interfaces | |
| # CORE_DUMP_USE_REGSET #define'd in linux/elf.h | |
| # TIF_SYSCALL_TRACE calls tracehook_report_syscall_{entry,exit} | |
| # TIF_NOTIFY_RESUME calls tracehook_notify_resume() | |
| # signal delivery calls tracehook_signal_handler() | |
| # | |
| config HAVE_ARCH_TRACEHOOK | |
| bool | |
| config HAVE_DMA_ATTRS | |
| bool | |
| config USE_GENERIC_SMP_HELPERS | |
| bool | |
| config HAVE_REGS_AND_STACK_ACCESS_API | |
| bool | |
| help | |
| This symbol should be selected by an architecure if it supports | |
| the API needed to access registers and stack entries from pt_regs, | |
| declared in asm/ptrace.h | |
| For example the kprobes-based event tracer needs this API. | |
| config HAVE_CLK | |
| bool | |
| help | |
| The <linux/clk.h> calls support software clock gating and | |
| thus are a key power management tool on many systems. | |
| config HAVE_DMA_API_DEBUG | |
| bool | |
| config HAVE_HW_BREAKPOINT | |
| bool | |
| depends on PERF_EVENTS | |
| config HAVE_MIXED_BREAKPOINTS_REGS | |
| bool | |
| depends on HAVE_HW_BREAKPOINT | |
| help | |
| Depending on the arch implementation of hardware breakpoints, | |
| some of them have separate registers for data and instruction | |
| breakpoints addresses, others have mixed registers to store | |
| them but define the access type in a control register. | |
| Select this option if your arch implements breakpoints under the | |
| latter fashion. | |
| config HAVE_USER_RETURN_NOTIFIER | |
| bool | |
| config HAVE_PERF_EVENTS_NMI | |
| bool | |
| help | |
| System hardware can generate an NMI using the perf event | |
| subsystem. Also has support for calculating CPU cycle events | |
| to determine how many clock cycles in a given period. | |
| config HAVE_ARCH_JUMP_LABEL | |
| bool | |
| config HAVE_ARCH_MUTEX_CPU_RELAX | |
| bool | |
| config HAVE_RCU_TABLE_FREE | |
| bool | |
| config ARCH_HAVE_NMI_SAFE_CMPXCHG | |
| bool | |
| config HAVE_ALIGNED_STRUCT_PAGE | |
| bool | |
| help | |
| This makes sure that struct pages are double word aligned and that | |
| e.g. the SLUB allocator can perform double word atomic operations | |
| on a struct page for better performance. However selecting this | |
| might increase the size of a struct page by a word. | |
| config HAVE_CMPXCHG_LOCAL | |
| bool | |
| config HAVE_CMPXCHG_DOUBLE | |
| bool | |
| source "kernel/gcov/Kconfig" |