1fb32e03fSMathieu Desnoyers# 2fb32e03fSMathieu Desnoyers# General architecture dependent options 3fb32e03fSMathieu Desnoyers# 4125e5645SMathieu Desnoyers 5125e5645SMathieu Desnoyersconfig OPROFILE 6b309a294SRobert Richter tristate "OProfile system profiling" 7125e5645SMathieu Desnoyers depends on PROFILING 8125e5645SMathieu Desnoyers depends on HAVE_OPROFILE 9d69d59f4SIngo Molnar select RING_BUFFER 109a5963ebSChristian Borntraeger select RING_BUFFER_ALLOW_SWAP 11125e5645SMathieu Desnoyers help 12125e5645SMathieu Desnoyers OProfile is a profiling system capable of profiling the 13125e5645SMathieu Desnoyers whole system, include the kernel, kernel modules, libraries, 14125e5645SMathieu Desnoyers and applications. 15125e5645SMathieu Desnoyers 16125e5645SMathieu Desnoyers If unsure, say N. 17125e5645SMathieu Desnoyers 184d4036e0SJason Yehconfig OPROFILE_EVENT_MULTIPLEX 194d4036e0SJason Yeh bool "OProfile multiplexing support (EXPERIMENTAL)" 204d4036e0SJason Yeh default n 214d4036e0SJason Yeh depends on OPROFILE && X86 224d4036e0SJason Yeh help 234d4036e0SJason Yeh The number of hardware counters is limited. The multiplexing 244d4036e0SJason Yeh feature enables OProfile to gather more events than counters 254d4036e0SJason Yeh are provided by the hardware. This is realized by switching 264d4036e0SJason Yeh between events at an user specified time interval. 274d4036e0SJason Yeh 284d4036e0SJason Yeh If unsure, say N. 294d4036e0SJason Yeh 30125e5645SMathieu Desnoyersconfig HAVE_OPROFILE 319ba16087SJan Beulich bool 32125e5645SMathieu Desnoyers 33125e5645SMathieu Desnoyersconfig KPROBES 34125e5645SMathieu Desnoyers bool "Kprobes" 3505ed160eSMasami Hiramatsu depends on MODULES 36125e5645SMathieu Desnoyers depends on HAVE_KPROBES 3705ed160eSMasami Hiramatsu select KALLSYMS 38125e5645SMathieu Desnoyers help 39125e5645SMathieu Desnoyers Kprobes allows you to trap at almost any kernel address and 40125e5645SMathieu Desnoyers execute a callback function. register_kprobe() establishes 41125e5645SMathieu Desnoyers a probepoint and specifies the callback. Kprobes is useful 42125e5645SMathieu Desnoyers for kernel debugging, non-intrusive instrumentation and testing. 43125e5645SMathieu Desnoyers If in doubt, say "N". 44125e5645SMathieu Desnoyers 4545f81b1cSSteven Rostedtconfig JUMP_LABEL 4645f81b1cSSteven Rostedt bool "Optimize trace point call sites" 4745f81b1cSSteven Rostedt depends on HAVE_ARCH_JUMP_LABEL 4845f81b1cSSteven Rostedt help 4945f81b1cSSteven Rostedt If it is detected that the compiler has support for "asm goto", 5045f81b1cSSteven Rostedt the kernel will compile trace point locations with just a 5145f81b1cSSteven Rostedt nop instruction. When trace points are enabled, the nop will 5245f81b1cSSteven Rostedt be converted to a jump to the trace function. This technique 5345f81b1cSSteven Rostedt lowers overhead and stress on the branch prediction of the 5445f81b1cSSteven Rostedt processor. 5545f81b1cSSteven Rostedt 5645f81b1cSSteven Rostedt On i386, options added to the compiler flags may increase 5745f81b1cSSteven Rostedt the size of the kernel slightly. 5845f81b1cSSteven Rostedt 59afd66255SMasami Hiramatsuconfig OPTPROBES 605cc718b9SMasami Hiramatsu def_bool y 615cc718b9SMasami Hiramatsu depends on KPROBES && HAVE_OPTPROBES 62afd66255SMasami Hiramatsu depends on !PREEMPT 63afd66255SMasami Hiramatsu 6458340a07SJohannes Bergconfig HAVE_EFFICIENT_UNALIGNED_ACCESS 659ba16087SJan Beulich bool 6658340a07SJohannes Berg help 6758340a07SJohannes Berg Some architectures are unable to perform unaligned accesses 6858340a07SJohannes Berg without the use of get_unaligned/put_unaligned. Others are 6958340a07SJohannes Berg unable to perform such accesses efficiently (e.g. trap on 7058340a07SJohannes Berg unaligned access and require fixing it up in the exception 7158340a07SJohannes Berg handler.) 7258340a07SJohannes Berg 7358340a07SJohannes Berg This symbol should be selected by an architecture if it can 7458340a07SJohannes Berg perform unaligned accesses efficiently to allow different 7558340a07SJohannes Berg code paths to be selected for these cases. Some network 7658340a07SJohannes Berg drivers, for example, could opt to not fix up alignment 7758340a07SJohannes Berg problems with received packets if doing so would not help 7858340a07SJohannes Berg much. 7958340a07SJohannes Berg 8058340a07SJohannes Berg See Documentation/unaligned-memory-access.txt for more 8158340a07SJohannes Berg information on the topic of unaligned memory accesses. 8258340a07SJohannes Berg 831a94bc34SHeiko Carstensconfig HAVE_SYSCALL_WRAPPERS 841a94bc34SHeiko Carstens bool 851a94bc34SHeiko Carstens 869edddaa2SAnanth N Mavinakayanahalliconfig KRETPROBES 879edddaa2SAnanth N Mavinakayanahalli def_bool y 889edddaa2SAnanth N Mavinakayanahalli depends on KPROBES && HAVE_KRETPROBES 899edddaa2SAnanth N Mavinakayanahalli 907c68af6eSAvi Kivityconfig USER_RETURN_NOTIFIER 917c68af6eSAvi Kivity bool 927c68af6eSAvi Kivity depends on HAVE_USER_RETURN_NOTIFIER 937c68af6eSAvi Kivity help 947c68af6eSAvi Kivity Provide a kernel-internal notification when a cpu is about to 957c68af6eSAvi Kivity switch to user mode. 967c68af6eSAvi Kivity 9728b2ee20SRik van Rielconfig HAVE_IOREMAP_PROT 989ba16087SJan Beulich bool 9928b2ee20SRik van Riel 100125e5645SMathieu Desnoyersconfig HAVE_KPROBES 1019ba16087SJan Beulich bool 1029edddaa2SAnanth N Mavinakayanahalli 1039edddaa2SAnanth N Mavinakayanahalliconfig HAVE_KRETPROBES 1049ba16087SJan Beulich bool 10574bc7ceeSArthur Kepner 106afd66255SMasami Hiramatsuconfig HAVE_OPTPROBES 107afd66255SMasami Hiramatsu bool 1081f5a4ad9SRoland McGrath# 1091f5a4ad9SRoland McGrath# An arch should select this if it provides all these things: 1101f5a4ad9SRoland McGrath# 1111f5a4ad9SRoland McGrath# task_pt_regs() in asm/processor.h or asm/ptrace.h 1121f5a4ad9SRoland McGrath# arch_has_single_step() if there is hardware single-step support 1131f5a4ad9SRoland McGrath# arch_has_block_step() if there is hardware block-step support 1141f5a4ad9SRoland McGrath# asm/syscall.h supplying asm-generic/syscall.h interface 1151f5a4ad9SRoland McGrath# linux/regset.h user_regset interfaces 1161f5a4ad9SRoland McGrath# CORE_DUMP_USE_REGSET #define'd in linux/elf.h 1171f5a4ad9SRoland McGrath# TIF_SYSCALL_TRACE calls tracehook_report_syscall_{entry,exit} 1181f5a4ad9SRoland McGrath# TIF_NOTIFY_RESUME calls tracehook_notify_resume() 1191f5a4ad9SRoland McGrath# signal delivery calls tracehook_signal_handler() 1201f5a4ad9SRoland McGrath# 1211f5a4ad9SRoland McGrathconfig HAVE_ARCH_TRACEHOOK 1229ba16087SJan Beulich bool 1231f5a4ad9SRoland McGrath 12474bc7ceeSArthur Kepnerconfig HAVE_DMA_ATTRS 1259ba16087SJan Beulich bool 1263d442233SJens Axboe 1273d442233SJens Axboeconfig USE_GENERIC_SMP_HELPERS 1289ba16087SJan Beulich bool 1299483a578SDavid Brownell 130f850c30cSHeiko Carstensconfig HAVE_REGS_AND_STACK_ACCESS_API 131f850c30cSHeiko Carstens bool 132e01292b1SHeiko Carstens help 133e01292b1SHeiko Carstens This symbol should be selected by an architecure if it supports 134e01292b1SHeiko Carstens the API needed to access registers and stack entries from pt_regs, 135e01292b1SHeiko Carstens declared in asm/ptrace.h 136e01292b1SHeiko Carstens For example the kprobes-based event tracer needs this API. 137f850c30cSHeiko Carstens 1389483a578SDavid Brownellconfig HAVE_CLK 1399ba16087SJan Beulich bool 1409483a578SDavid Brownell help 1419483a578SDavid Brownell The <linux/clk.h> calls support software clock gating and 1429483a578SDavid Brownell thus are a key power management tool on many systems. 1439483a578SDavid Brownell 1445ee00bd4SJoerg Roedelconfig HAVE_DMA_API_DEBUG 1455ee00bd4SJoerg Roedel bool 14636cd3c9fSHeiko Carstens 14762a038d3SK.Prasadconfig HAVE_HW_BREAKPOINT 14862a038d3SK.Prasad bool 14999e8c5a3SFrederic Weisbecker depends on PERF_EVENTS 15062a038d3SK.Prasad 1510102752eSFrederic Weisbeckerconfig HAVE_MIXED_BREAKPOINTS_REGS 1520102752eSFrederic Weisbecker bool 1530102752eSFrederic Weisbecker depends on HAVE_HW_BREAKPOINT 1540102752eSFrederic Weisbecker help 1550102752eSFrederic Weisbecker Depending on the arch implementation of hardware breakpoints, 1560102752eSFrederic Weisbecker some of them have separate registers for data and instruction 1570102752eSFrederic Weisbecker breakpoints addresses, others have mixed registers to store 1580102752eSFrederic Weisbecker them but define the access type in a control register. 1590102752eSFrederic Weisbecker Select this option if your arch implements breakpoints under the 1600102752eSFrederic Weisbecker latter fashion. 1610102752eSFrederic Weisbecker 1627c68af6eSAvi Kivityconfig HAVE_USER_RETURN_NOTIFIER 1637c68af6eSAvi Kivity bool 164a1922ed6SIngo Molnar 165c01d4323SFrederic Weisbeckerconfig HAVE_PERF_EVENTS_NMI 166c01d4323SFrederic Weisbecker bool 16723637d47SFrederic Weisbecker help 16823637d47SFrederic Weisbecker System hardware can generate an NMI using the perf event 16923637d47SFrederic Weisbecker subsystem. Also has support for calculating CPU cycle events 17023637d47SFrederic Weisbecker to determine how many clock cycles in a given period. 171c01d4323SFrederic Weisbecker 172bf5438fcSJason Baronconfig HAVE_ARCH_JUMP_LABEL 173bf5438fcSJason Baron bool 174bf5438fcSJason Baron 175335d7afbSGerald Schaeferconfig HAVE_ARCH_MUTEX_CPU_RELAX 176335d7afbSGerald Schaefer bool 177335d7afbSGerald Schaefer 17826723911SPeter Zijlstraconfig HAVE_RCU_TABLE_FREE 17926723911SPeter Zijlstra bool 18026723911SPeter Zijlstra 181*df013ffbSHuang Yingconfig ARCH_HAVE_NMI_SAFE_CMPXCHG 182*df013ffbSHuang Ying bool 183*df013ffbSHuang Ying 1842521f2c2SPeter Oberparleitersource "kernel/gcov/Kconfig" 185