# # 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 KPROBES bool "Kprobes" depends on KALLSYMS && MODULES depends on HAVE_KPROBES 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 OPTPROBES bool "Kprobes jump optimization support (EXPERIMENTAL)" default y depends on KPROBES depends on !PREEMPT depends on HAVE_OPTPROBES select KALLSYMS_ALL help This option will allow kprobes to optimize breakpoint to a jump for reducing its overhead. 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 calls support software clock gating and thus are a key power management tool on many systems. config HAVE_DMA_API_DEBUG bool config HAVE_DEFAULT_NO_SPIN_MUTEXES bool config HAVE_HW_BREAKPOINT bool depends on PERF_EVENTS config HAVE_USER_RETURN_NOTIFIER bool source "kernel/gcov/Kconfig"