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 33dcfce4a0SRobert Richterconfig OPROFILE_NMI_TIMER 34dcfce4a0SRobert Richter def_bool y 35dcfce4a0SRobert Richter depends on PERF_EVENTS && HAVE_PERF_EVENTS_NMI 36dcfce4a0SRobert Richter 37125e5645SMathieu Desnoyersconfig KPROBES 38125e5645SMathieu Desnoyers bool "Kprobes" 3905ed160eSMasami Hiramatsu depends on MODULES 40125e5645SMathieu Desnoyers depends on HAVE_KPROBES 4105ed160eSMasami Hiramatsu select KALLSYMS 42125e5645SMathieu Desnoyers help 43125e5645SMathieu Desnoyers Kprobes allows you to trap at almost any kernel address and 44125e5645SMathieu Desnoyers execute a callback function. register_kprobe() establishes 45125e5645SMathieu Desnoyers a probepoint and specifies the callback. Kprobes is useful 46125e5645SMathieu Desnoyers for kernel debugging, non-intrusive instrumentation and testing. 47125e5645SMathieu Desnoyers If in doubt, say "N". 48125e5645SMathieu Desnoyers 4945f81b1cSSteven Rostedtconfig JUMP_LABEL 5045f81b1cSSteven Rostedt bool "Optimize trace point call sites" 5145f81b1cSSteven Rostedt depends on HAVE_ARCH_JUMP_LABEL 5245f81b1cSSteven Rostedt help 5345f81b1cSSteven Rostedt If it is detected that the compiler has support for "asm goto", 5445f81b1cSSteven Rostedt the kernel will compile trace point locations with just a 5545f81b1cSSteven Rostedt nop instruction. When trace points are enabled, the nop will 5645f81b1cSSteven Rostedt be converted to a jump to the trace function. This technique 5745f81b1cSSteven Rostedt lowers overhead and stress on the branch prediction of the 5845f81b1cSSteven Rostedt processor. 5945f81b1cSSteven Rostedt 6045f81b1cSSteven Rostedt On i386, options added to the compiler flags may increase 6145f81b1cSSteven Rostedt the size of the kernel slightly. 6245f81b1cSSteven Rostedt 63afd66255SMasami Hiramatsuconfig OPTPROBES 645cc718b9SMasami Hiramatsu def_bool y 655cc718b9SMasami Hiramatsu depends on KPROBES && HAVE_OPTPROBES 66afd66255SMasami Hiramatsu depends on !PREEMPT 67afd66255SMasami Hiramatsu 6858340a07SJohannes Bergconfig HAVE_EFFICIENT_UNALIGNED_ACCESS 699ba16087SJan Beulich bool 7058340a07SJohannes Berg help 7158340a07SJohannes Berg Some architectures are unable to perform unaligned accesses 7258340a07SJohannes Berg without the use of get_unaligned/put_unaligned. Others are 7358340a07SJohannes Berg unable to perform such accesses efficiently (e.g. trap on 7458340a07SJohannes Berg unaligned access and require fixing it up in the exception 7558340a07SJohannes Berg handler.) 7658340a07SJohannes Berg 7758340a07SJohannes Berg This symbol should be selected by an architecture if it can 7858340a07SJohannes Berg perform unaligned accesses efficiently to allow different 7958340a07SJohannes Berg code paths to be selected for these cases. Some network 8058340a07SJohannes Berg drivers, for example, could opt to not fix up alignment 8158340a07SJohannes Berg problems with received packets if doing so would not help 8258340a07SJohannes Berg much. 8358340a07SJohannes Berg 8458340a07SJohannes Berg See Documentation/unaligned-memory-access.txt for more 8558340a07SJohannes Berg information on the topic of unaligned memory accesses. 8658340a07SJohannes Berg 871a94bc34SHeiko Carstensconfig HAVE_SYSCALL_WRAPPERS 881a94bc34SHeiko Carstens bool 891a94bc34SHeiko Carstens 909edddaa2SAnanth N Mavinakayanahalliconfig KRETPROBES 919edddaa2SAnanth N Mavinakayanahalli def_bool y 929edddaa2SAnanth N Mavinakayanahalli depends on KPROBES && HAVE_KRETPROBES 939edddaa2SAnanth N Mavinakayanahalli 947c68af6eSAvi Kivityconfig USER_RETURN_NOTIFIER 957c68af6eSAvi Kivity bool 967c68af6eSAvi Kivity depends on HAVE_USER_RETURN_NOTIFIER 977c68af6eSAvi Kivity help 987c68af6eSAvi Kivity Provide a kernel-internal notification when a cpu is about to 997c68af6eSAvi Kivity switch to user mode. 1007c68af6eSAvi Kivity 10128b2ee20SRik van Rielconfig HAVE_IOREMAP_PROT 1029ba16087SJan Beulich bool 10328b2ee20SRik van Riel 104125e5645SMathieu Desnoyersconfig HAVE_KPROBES 1059ba16087SJan Beulich bool 1069edddaa2SAnanth N Mavinakayanahalli 1079edddaa2SAnanth N Mavinakayanahalliconfig HAVE_KRETPROBES 1089ba16087SJan Beulich bool 10974bc7ceeSArthur Kepner 110afd66255SMasami Hiramatsuconfig HAVE_OPTPROBES 111afd66255SMasami Hiramatsu bool 1121f5a4ad9SRoland McGrath# 1131f5a4ad9SRoland McGrath# An arch should select this if it provides all these things: 1141f5a4ad9SRoland McGrath# 1151f5a4ad9SRoland McGrath# task_pt_regs() in asm/processor.h or asm/ptrace.h 1161f5a4ad9SRoland McGrath# arch_has_single_step() if there is hardware single-step support 1171f5a4ad9SRoland McGrath# arch_has_block_step() if there is hardware block-step support 1181f5a4ad9SRoland McGrath# asm/syscall.h supplying asm-generic/syscall.h interface 1191f5a4ad9SRoland McGrath# linux/regset.h user_regset interfaces 1201f5a4ad9SRoland McGrath# CORE_DUMP_USE_REGSET #define'd in linux/elf.h 1211f5a4ad9SRoland McGrath# TIF_SYSCALL_TRACE calls tracehook_report_syscall_{entry,exit} 1221f5a4ad9SRoland McGrath# TIF_NOTIFY_RESUME calls tracehook_notify_resume() 1231f5a4ad9SRoland McGrath# signal delivery calls tracehook_signal_handler() 1241f5a4ad9SRoland McGrath# 1251f5a4ad9SRoland McGrathconfig HAVE_ARCH_TRACEHOOK 1269ba16087SJan Beulich bool 1271f5a4ad9SRoland McGrath 12874bc7ceeSArthur Kepnerconfig HAVE_DMA_ATTRS 1299ba16087SJan Beulich bool 1303d442233SJens Axboe 1313d442233SJens Axboeconfig USE_GENERIC_SMP_HELPERS 1329ba16087SJan Beulich bool 1339483a578SDavid Brownell 134f850c30cSHeiko Carstensconfig HAVE_REGS_AND_STACK_ACCESS_API 135f850c30cSHeiko Carstens bool 136e01292b1SHeiko Carstens help 137e01292b1SHeiko Carstens This symbol should be selected by an architecure if it supports 138e01292b1SHeiko Carstens the API needed to access registers and stack entries from pt_regs, 139e01292b1SHeiko Carstens declared in asm/ptrace.h 140e01292b1SHeiko Carstens For example the kprobes-based event tracer needs this API. 141f850c30cSHeiko Carstens 1429483a578SDavid Brownellconfig HAVE_CLK 1439ba16087SJan Beulich bool 1449483a578SDavid Brownell help 1459483a578SDavid Brownell The <linux/clk.h> calls support software clock gating and 1469483a578SDavid Brownell thus are a key power management tool on many systems. 1479483a578SDavid Brownell 1485ee00bd4SJoerg Roedelconfig HAVE_DMA_API_DEBUG 1495ee00bd4SJoerg Roedel bool 15036cd3c9fSHeiko Carstens 15162a038d3SK.Prasadconfig HAVE_HW_BREAKPOINT 15262a038d3SK.Prasad bool 15399e8c5a3SFrederic Weisbecker depends on PERF_EVENTS 15462a038d3SK.Prasad 1550102752eSFrederic Weisbeckerconfig HAVE_MIXED_BREAKPOINTS_REGS 1560102752eSFrederic Weisbecker bool 1570102752eSFrederic Weisbecker depends on HAVE_HW_BREAKPOINT 1580102752eSFrederic Weisbecker help 1590102752eSFrederic Weisbecker Depending on the arch implementation of hardware breakpoints, 1600102752eSFrederic Weisbecker some of them have separate registers for data and instruction 1610102752eSFrederic Weisbecker breakpoints addresses, others have mixed registers to store 1620102752eSFrederic Weisbecker them but define the access type in a control register. 1630102752eSFrederic Weisbecker Select this option if your arch implements breakpoints under the 1640102752eSFrederic Weisbecker latter fashion. 1650102752eSFrederic Weisbecker 1667c68af6eSAvi Kivityconfig HAVE_USER_RETURN_NOTIFIER 1677c68af6eSAvi Kivity bool 168a1922ed6SIngo Molnar 169c01d4323SFrederic Weisbeckerconfig HAVE_PERF_EVENTS_NMI 170c01d4323SFrederic Weisbecker bool 17123637d47SFrederic Weisbecker help 17223637d47SFrederic Weisbecker System hardware can generate an NMI using the perf event 17323637d47SFrederic Weisbecker subsystem. Also has support for calculating CPU cycle events 17423637d47SFrederic Weisbecker to determine how many clock cycles in a given period. 175c01d4323SFrederic Weisbecker 176bf5438fcSJason Baronconfig HAVE_ARCH_JUMP_LABEL 177bf5438fcSJason Baron bool 178bf5438fcSJason Baron 179335d7afbSGerald Schaeferconfig HAVE_ARCH_MUTEX_CPU_RELAX 180335d7afbSGerald Schaefer bool 181335d7afbSGerald Schaefer 18226723911SPeter Zijlstraconfig HAVE_RCU_TABLE_FREE 18326723911SPeter Zijlstra bool 18426723911SPeter Zijlstra 185df013ffbSHuang Yingconfig ARCH_HAVE_NMI_SAFE_CMPXCHG 186df013ffbSHuang Ying bool 187df013ffbSHuang Ying 188*43570fd2SHeiko Carstensconfig HAVE_ALIGNED_STRUCT_PAGE 189*43570fd2SHeiko Carstens bool 190*43570fd2SHeiko Carstens help 191*43570fd2SHeiko Carstens This makes sure that struct pages are double word aligned and that 192*43570fd2SHeiko Carstens e.g. the SLUB allocator can perform double word atomic operations 193*43570fd2SHeiko Carstens on a struct page for better performance. However selecting this 194*43570fd2SHeiko Carstens might increase the size of a struct page by a word. 195*43570fd2SHeiko Carstens 1962521f2c2SPeter Oberparleitersource "kernel/gcov/Kconfig" 197