2 # General architecture dependent options
6 tristate "OProfile system profiling"
8 depends on HAVE_OPROFILE
10 select RING_BUFFER_ALLOW_SWAP
12 OProfile is a profiling system capable of profiling the
13 whole system, include the kernel, kernel modules, libraries,
18 config OPROFILE_EVENT_MULTIPLEX
19 bool "OProfile multiplexing support (EXPERIMENTAL)"
21 depends on OPROFILE && X86
23 The number of hardware counters is limited. The multiplexing
24 feature enables OProfile to gather more events than counters
25 are provided by the hardware. This is realized by switching
26 between events at an user specified time interval.
33 config OPROFILE_NMI_TIMER
35 depends on PERF_EVENTS && HAVE_PERF_EVENTS_NMI
40 depends on HAVE_KPROBES
43 Kprobes allows you to trap at almost any kernel address and
44 execute a callback function. register_kprobe() establishes
45 a probepoint and specifies the callback. Kprobes is useful
46 for kernel debugging, non-intrusive instrumentation and testing.
50 bool "Optimize trace point call sites"
51 depends on HAVE_ARCH_JUMP_LABEL
53 If it is detected that the compiler has support for "asm goto",
54 the kernel will compile trace point locations with just a
55 nop instruction. When trace points are enabled, the nop will
56 be converted to a jump to the trace function. This technique
57 lowers overhead and stress on the branch prediction of the
60 On i386, options added to the compiler flags may increase
61 the size of the kernel slightly.
65 depends on KPROBES && HAVE_OPTPROBES
68 config HAVE_EFFICIENT_UNALIGNED_ACCESS
71 Some architectures are unable to perform unaligned accesses
72 without the use of get_unaligned/put_unaligned. Others are
73 unable to perform such accesses efficiently (e.g. trap on
74 unaligned access and require fixing it up in the exception
77 This symbol should be selected by an architecture if it can
78 perform unaligned accesses efficiently to allow different
79 code paths to be selected for these cases. Some network
80 drivers, for example, could opt to not fix up alignment
81 problems with received packets if doing so would not help
84 See Documentation/unaligned-memory-access.txt for more
85 information on the topic of unaligned memory accesses.
87 config HAVE_SYSCALL_WRAPPERS
92 depends on KPROBES && HAVE_KRETPROBES
94 config USER_RETURN_NOTIFIER
96 depends on HAVE_USER_RETURN_NOTIFIER
98 Provide a kernel-internal notification when a cpu is about to
101 config HAVE_IOREMAP_PROT
107 config HAVE_KRETPROBES
110 config HAVE_OPTPROBES
113 # An arch should select this if it provides all these things:
115 # task_pt_regs() in asm/processor.h or asm/ptrace.h
116 # arch_has_single_step() if there is hardware single-step support
117 # arch_has_block_step() if there is hardware block-step support
118 # asm/syscall.h supplying asm-generic/syscall.h interface
119 # linux/regset.h user_regset interfaces
120 # CORE_DUMP_USE_REGSET #define'd in linux/elf.h
121 # TIF_SYSCALL_TRACE calls tracehook_report_syscall_{entry,exit}
122 # TIF_NOTIFY_RESUME calls tracehook_notify_resume()
123 # signal delivery calls tracehook_signal_handler()
125 config HAVE_ARCH_TRACEHOOK
128 config HAVE_DMA_ATTRS
131 config USE_GENERIC_SMP_HELPERS
134 config HAVE_REGS_AND_STACK_ACCESS_API
137 This symbol should be selected by an architecure if it supports
138 the API needed to access registers and stack entries from pt_regs,
139 declared in asm/ptrace.h
140 For example the kprobes-based event tracer needs this API.
145 The <linux/clk.h> calls support software clock gating and
146 thus are a key power management tool on many systems.
148 config HAVE_DMA_API_DEBUG
151 config HAVE_HW_BREAKPOINT
153 depends on PERF_EVENTS
155 config HAVE_MIXED_BREAKPOINTS_REGS
157 depends on HAVE_HW_BREAKPOINT
159 Depending on the arch implementation of hardware breakpoints,
160 some of them have separate registers for data and instruction
161 breakpoints addresses, others have mixed registers to store
162 them but define the access type in a control register.
163 Select this option if your arch implements breakpoints under the
166 config HAVE_USER_RETURN_NOTIFIER
169 config HAVE_PERF_EVENTS_NMI
172 System hardware can generate an NMI using the perf event
173 subsystem. Also has support for calculating CPU cycle events
174 to determine how many clock cycles in a given period.
176 config HAVE_ARCH_JUMP_LABEL
179 config HAVE_ARCH_MUTEX_CPU_RELAX
182 config HAVE_RCU_TABLE_FREE
185 config ARCH_HAVE_NMI_SAFE_CMPXCHG
188 source "kernel/gcov/Kconfig"