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1 | # |
2 | # General architecture dependent options |
3 | # |
4 | |
5 | config OPROFILE |
6 | tristate "OProfile system profiling" |
7 | depends on PROFILING |
8 | depends on HAVE_OPROFILE |
9 | select RING_BUFFER |
10 | select RING_BUFFER_ALLOW_SWAP |
11 | help |
12 | OProfile is a profiling system capable of profiling the |
13 | whole system, include the kernel, kernel modules, libraries, |
14 | and applications. |
15 | |
16 | If unsure, say N. |
17 | |
18 | config OPROFILE_EVENT_MULTIPLEX |
19 | bool "OProfile multiplexing support (EXPERIMENTAL)" |
20 | default n |
21 | depends on OPROFILE && X86 |
22 | help |
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. |
27 | |
28 | If unsure, say N. |
29 | |
30 | config HAVE_OPROFILE |
31 | bool |
32 | |
33 | config KPROBES |
34 | bool "Kprobes" |
35 | depends on MODULES |
36 | depends on HAVE_KPROBES |
37 | select KALLSYMS |
38 | help |
39 | Kprobes allows you to trap at almost any kernel address and |
40 | execute a callback function. register_kprobe() establishes |
41 | a probepoint and specifies the callback. Kprobes is useful |
42 | for kernel debugging, non-intrusive instrumentation and testing. |
43 | If in doubt, say "N". |
44 | |
45 | config JUMP_LABEL |
46 | bool "Optimize trace point call sites" |
47 | depends on HAVE_ARCH_JUMP_LABEL |
48 | help |
49 | If it is detected that the compiler has support for "asm goto", |
50 | the kernel will compile trace point locations with just a |
51 | nop instruction. When trace points are enabled, the nop will |
52 | be converted to a jump to the trace function. This technique |
53 | lowers overhead and stress on the branch prediction of the |
54 | processor. |
55 | |
56 | On i386, options added to the compiler flags may increase |
57 | the size of the kernel slightly. |
58 | |
59 | config OPTPROBES |
60 | def_bool y |
61 | depends on KPROBES && HAVE_OPTPROBES |
62 | depends on !PREEMPT |
63 | |
64 | config HAVE_EFFICIENT_UNALIGNED_ACCESS |
65 | bool |
66 | help |
67 | Some architectures are unable to perform unaligned accesses |
68 | without the use of get_unaligned/put_unaligned. Others are |
69 | unable to perform such accesses efficiently (e.g. trap on |
70 | unaligned access and require fixing it up in the exception |
71 | handler.) |
72 | |
73 | This symbol should be selected by an architecture if it can |
74 | perform unaligned accesses efficiently to allow different |
75 | code paths to be selected for these cases. Some network |
76 | drivers, for example, could opt to not fix up alignment |
77 | problems with received packets if doing so would not help |
78 | much. |
79 | |
80 | See Documentation/unaligned-memory-access.txt for more |
81 | information on the topic of unaligned memory accesses. |
82 | |
83 | config HAVE_SYSCALL_WRAPPERS |
84 | bool |
85 | |
86 | config KRETPROBES |
87 | def_bool y |
88 | depends on KPROBES && HAVE_KRETPROBES |
89 | |
90 | config USER_RETURN_NOTIFIER |
91 | bool |
92 | depends on HAVE_USER_RETURN_NOTIFIER |
93 | help |
94 | Provide a kernel-internal notification when a cpu is about to |
95 | switch to user mode. |
96 | |
97 | config HAVE_IOREMAP_PROT |
98 | bool |
99 | |
100 | config HAVE_KPROBES |
101 | bool |
102 | |
103 | config HAVE_KRETPROBES |
104 | bool |
105 | |
106 | config HAVE_OPTPROBES |
107 | bool |
108 | # |
109 | # An arch should select this if it provides all these things: |
110 | # |
111 | # task_pt_regs() in asm/processor.h or asm/ptrace.h |
112 | # arch_has_single_step() if there is hardware single-step support |
113 | # arch_has_block_step() if there is hardware block-step support |
114 | # asm/syscall.h supplying asm-generic/syscall.h interface |
115 | # linux/regset.h user_regset interfaces |
116 | # CORE_DUMP_USE_REGSET #define'd in linux/elf.h |
117 | # TIF_SYSCALL_TRACE calls tracehook_report_syscall_{entry,exit} |
118 | # TIF_NOTIFY_RESUME calls tracehook_notify_resume() |
119 | # signal delivery calls tracehook_signal_handler() |
120 | # |
121 | config HAVE_ARCH_TRACEHOOK |
122 | bool |
123 | |
124 | config HAVE_DMA_ATTRS |
125 | bool |
126 | |
127 | config USE_GENERIC_SMP_HELPERS |
128 | bool |
129 | |
130 | config HAVE_REGS_AND_STACK_ACCESS_API |
131 | bool |
132 | help |
133 | This symbol should be selected by an architecure if it supports |
134 | the API needed to access registers and stack entries from pt_regs, |
135 | declared in asm/ptrace.h |
136 | For example the kprobes-based event tracer needs this API. |
137 | |
138 | config HAVE_CLK |
139 | bool |
140 | help |
141 | The <linux/clk.h> calls support software clock gating and |
142 | thus are a key power management tool on many systems. |
143 | |
144 | config HAVE_DMA_API_DEBUG |
145 | bool |
146 | |
147 | config HAVE_HW_BREAKPOINT |
148 | bool |
149 | depends on PERF_EVENTS |
150 | |
151 | config HAVE_MIXED_BREAKPOINTS_REGS |
152 | bool |
153 | depends on HAVE_HW_BREAKPOINT |
154 | help |
155 | Depending on the arch implementation of hardware breakpoints, |
156 | some of them have separate registers for data and instruction |
157 | breakpoints addresses, others have mixed registers to store |
158 | them but define the access type in a control register. |
159 | Select this option if your arch implements breakpoints under the |
160 | latter fashion. |
161 | |
162 | config HAVE_USER_RETURN_NOTIFIER |
163 | bool |
164 | |
165 | config HAVE_PERF_EVENTS_NMI |
166 | bool |
167 | help |
168 | System hardware can generate an NMI using the perf event |
169 | subsystem. Also has support for calculating CPU cycle events |
170 | to determine how many clock cycles in a given period. |
171 | |
172 | config HAVE_ARCH_JUMP_LABEL |
173 | bool |
174 | |
175 | config HAVE_ARCH_MUTEX_CPU_RELAX |
176 | bool |
177 | |
178 | config HAVE_RCU_TABLE_FREE |
179 | bool |
180 | |
181 | config ARCH_HAVE_NMI_SAFE_CMPXCHG |
182 | bool |
183 | |
184 | source "kernel/gcov/Kconfig" |
185 |
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