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
71 config HAVE_EFFICIENT_UNALIGNED_ACCESS
74 Some architectures are unable to perform unaligned accesses
75 without the use of get_unaligned/put_unaligned. Others are
76 unable to perform such accesses efficiently (e.g. trap on
77 unaligned access and require fixing it up in the exception
80 This symbol should be selected by an architecture if it can
81 perform unaligned accesses efficiently to allow different
82 code paths to be selected for these cases. Some network
83 drivers, for example, could opt to not fix up alignment
84 problems with received packets if doing so would not help
87 See Documentation/unaligned-memory-access.txt for more
88 information on the topic of unaligned memory accesses.
90 config HAVE_SYSCALL_WRAPPERS
95 depends on KPROBES && HAVE_KRETPROBES
97 config USER_RETURN_NOTIFIER
99 depends on HAVE_USER_RETURN_NOTIFIER
101 Provide a kernel-internal notification when a cpu is about to
104 config HAVE_IOREMAP_PROT
110 config HAVE_KRETPROBES
113 config HAVE_OPTPROBES
116 # An arch should select this if it provides all these things:
118 # task_pt_regs() in asm/processor.h or asm/ptrace.h
119 # arch_has_single_step() if there is hardware single-step support
120 # arch_has_block_step() if there is hardware block-step support
121 # asm/syscall.h supplying asm-generic/syscall.h interface
122 # linux/regset.h user_regset interfaces
123 # CORE_DUMP_USE_REGSET #define'd in linux/elf.h
124 # TIF_SYSCALL_TRACE calls tracehook_report_syscall_{entry,exit}
125 # TIF_NOTIFY_RESUME calls tracehook_notify_resume()
126 # signal delivery calls tracehook_signal_handler()
128 config HAVE_ARCH_TRACEHOOK
131 config HAVE_DMA_ATTRS
134 config USE_GENERIC_SMP_HELPERS
137 config HAVE_REGS_AND_STACK_ACCESS_API
140 This symbol should be selected by an architecure if it supports
141 the API needed to access registers and stack entries from pt_regs,
142 declared in asm/ptrace.h
143 For example the kprobes-based event tracer needs this API.
148 The <linux/clk.h> calls support software clock gating and
149 thus are a key power management tool on many systems.
151 config HAVE_DMA_API_DEBUG
154 config HAVE_HW_BREAKPOINT
156 depends on PERF_EVENTS
158 config HAVE_MIXED_BREAKPOINTS_REGS
160 depends on HAVE_HW_BREAKPOINT
162 Depending on the arch implementation of hardware breakpoints,
163 some of them have separate registers for data and instruction
164 breakpoints addresses, others have mixed registers to store
165 them but define the access type in a control register.
166 Select this option if your arch implements breakpoints under the
169 config HAVE_USER_RETURN_NOTIFIER
172 config HAVE_PERF_EVENTS_NMI
175 System hardware can generate an NMI using the perf event
176 subsystem. Also has support for calculating CPU cycle events
177 to determine how many clock cycles in a given period.
179 config HAVE_ARCH_JUMP_LABEL
182 config HAVE_ARCH_MUTEX_CPU_RELAX
185 config HAVE_RCU_TABLE_FREE
188 config ARCH_HAVE_NMI_SAFE_CMPXCHG
191 config HAVE_ALIGNED_STRUCT_PAGE
194 This makes sure that struct pages are double word aligned and that
195 e.g. the SLUB allocator can perform double word atomic operations
196 on a struct page for better performance. However selecting this
197 might increase the size of a struct page by a word.
199 config HAVE_CMPXCHG_LOCAL
202 source "kernel/gcov/Kconfig"