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 682b144498SSrikar Dronamrajuconfig UPROBES 697b2d81d4SIngo Molnar bool "Transparent user-space probes (EXPERIMENTAL)" 702b144498SSrikar Dronamraju depends on ARCH_SUPPORTS_UPROBES 712b144498SSrikar Dronamraju default n 722b144498SSrikar Dronamraju help 737b2d81d4SIngo Molnar Uprobes is the user-space counterpart to kprobes: they 747b2d81d4SIngo Molnar enable instrumentation applications (such as 'perf probe') 757b2d81d4SIngo Molnar to establish unintrusive probes in user-space binaries and 767b2d81d4SIngo Molnar libraries, by executing handler functions when the probes 777b2d81d4SIngo Molnar are hit by user-space applications. 787b2d81d4SIngo Molnar 797b2d81d4SIngo Molnar ( These probes come in the form of single-byte breakpoints, 807b2d81d4SIngo Molnar managed by the kernel and kept transparent to the probed 817b2d81d4SIngo Molnar application. ) 822b144498SSrikar Dronamraju 832b144498SSrikar Dronamraju If in doubt, say "N". 842b144498SSrikar Dronamraju 8558340a07SJohannes Bergconfig HAVE_EFFICIENT_UNALIGNED_ACCESS 869ba16087SJan Beulich bool 8758340a07SJohannes Berg help 8858340a07SJohannes Berg Some architectures are unable to perform unaligned accesses 8958340a07SJohannes Berg without the use of get_unaligned/put_unaligned. Others are 9058340a07SJohannes Berg unable to perform such accesses efficiently (e.g. trap on 9158340a07SJohannes Berg unaligned access and require fixing it up in the exception 9258340a07SJohannes Berg handler.) 9358340a07SJohannes Berg 9458340a07SJohannes Berg This symbol should be selected by an architecture if it can 9558340a07SJohannes Berg perform unaligned accesses efficiently to allow different 9658340a07SJohannes Berg code paths to be selected for these cases. Some network 9758340a07SJohannes Berg drivers, for example, could opt to not fix up alignment 9858340a07SJohannes Berg problems with received packets if doing so would not help 9958340a07SJohannes Berg much. 10058340a07SJohannes Berg 10158340a07SJohannes Berg See Documentation/unaligned-memory-access.txt for more 10258340a07SJohannes Berg information on the topic of unaligned memory accesses. 10358340a07SJohannes Berg 1041a94bc34SHeiko Carstensconfig HAVE_SYSCALL_WRAPPERS 1051a94bc34SHeiko Carstens bool 1061a94bc34SHeiko Carstens 1079edddaa2SAnanth N Mavinakayanahalliconfig KRETPROBES 1089edddaa2SAnanth N Mavinakayanahalli def_bool y 1099edddaa2SAnanth N Mavinakayanahalli depends on KPROBES && HAVE_KRETPROBES 1109edddaa2SAnanth N Mavinakayanahalli 1117c68af6eSAvi Kivityconfig USER_RETURN_NOTIFIER 1127c68af6eSAvi Kivity bool 1137c68af6eSAvi Kivity depends on HAVE_USER_RETURN_NOTIFIER 1147c68af6eSAvi Kivity help 1157c68af6eSAvi Kivity Provide a kernel-internal notification when a cpu is about to 1167c68af6eSAvi Kivity switch to user mode. 1177c68af6eSAvi Kivity 11828b2ee20SRik van Rielconfig HAVE_IOREMAP_PROT 1199ba16087SJan Beulich bool 12028b2ee20SRik van Riel 121125e5645SMathieu Desnoyersconfig HAVE_KPROBES 1229ba16087SJan Beulich bool 1239edddaa2SAnanth N Mavinakayanahalli 1249edddaa2SAnanth N Mavinakayanahalliconfig HAVE_KRETPROBES 1259ba16087SJan Beulich bool 12674bc7ceeSArthur Kepner 127afd66255SMasami Hiramatsuconfig HAVE_OPTPROBES 128afd66255SMasami Hiramatsu bool 1291f5a4ad9SRoland McGrath# 1301f5a4ad9SRoland McGrath# An arch should select this if it provides all these things: 1311f5a4ad9SRoland McGrath# 1321f5a4ad9SRoland McGrath# task_pt_regs() in asm/processor.h or asm/ptrace.h 1331f5a4ad9SRoland McGrath# arch_has_single_step() if there is hardware single-step support 1341f5a4ad9SRoland McGrath# arch_has_block_step() if there is hardware block-step support 1351f5a4ad9SRoland McGrath# asm/syscall.h supplying asm-generic/syscall.h interface 1361f5a4ad9SRoland McGrath# linux/regset.h user_regset interfaces 1371f5a4ad9SRoland McGrath# CORE_DUMP_USE_REGSET #define'd in linux/elf.h 1381f5a4ad9SRoland McGrath# TIF_SYSCALL_TRACE calls tracehook_report_syscall_{entry,exit} 1391f5a4ad9SRoland McGrath# TIF_NOTIFY_RESUME calls tracehook_notify_resume() 1401f5a4ad9SRoland McGrath# signal delivery calls tracehook_signal_handler() 1411f5a4ad9SRoland McGrath# 1421f5a4ad9SRoland McGrathconfig HAVE_ARCH_TRACEHOOK 1439ba16087SJan Beulich bool 1441f5a4ad9SRoland McGrath 14574bc7ceeSArthur Kepnerconfig HAVE_DMA_ATTRS 1469ba16087SJan Beulich bool 1473d442233SJens Axboe 1483d442233SJens Axboeconfig USE_GENERIC_SMP_HELPERS 1499ba16087SJan Beulich bool 1509483a578SDavid Brownell 151f850c30cSHeiko Carstensconfig HAVE_REGS_AND_STACK_ACCESS_API 152f850c30cSHeiko Carstens bool 153e01292b1SHeiko Carstens help 154e01292b1SHeiko Carstens This symbol should be selected by an architecure if it supports 155e01292b1SHeiko Carstens the API needed to access registers and stack entries from pt_regs, 156e01292b1SHeiko Carstens declared in asm/ptrace.h 157e01292b1SHeiko Carstens For example the kprobes-based event tracer needs this API. 158f850c30cSHeiko Carstens 1599483a578SDavid Brownellconfig HAVE_CLK 1609ba16087SJan Beulich bool 1619483a578SDavid Brownell help 1629483a578SDavid Brownell The <linux/clk.h> calls support software clock gating and 1639483a578SDavid Brownell thus are a key power management tool on many systems. 1649483a578SDavid Brownell 1655ee00bd4SJoerg Roedelconfig HAVE_DMA_API_DEBUG 1665ee00bd4SJoerg Roedel bool 16736cd3c9fSHeiko Carstens 16862a038d3SK.Prasadconfig HAVE_HW_BREAKPOINT 16962a038d3SK.Prasad bool 17099e8c5a3SFrederic Weisbecker depends on PERF_EVENTS 17162a038d3SK.Prasad 1720102752eSFrederic Weisbeckerconfig HAVE_MIXED_BREAKPOINTS_REGS 1730102752eSFrederic Weisbecker bool 1740102752eSFrederic Weisbecker depends on HAVE_HW_BREAKPOINT 1750102752eSFrederic Weisbecker help 1760102752eSFrederic Weisbecker Depending on the arch implementation of hardware breakpoints, 1770102752eSFrederic Weisbecker some of them have separate registers for data and instruction 1780102752eSFrederic Weisbecker breakpoints addresses, others have mixed registers to store 1790102752eSFrederic Weisbecker them but define the access type in a control register. 1800102752eSFrederic Weisbecker Select this option if your arch implements breakpoints under the 1810102752eSFrederic Weisbecker latter fashion. 1820102752eSFrederic Weisbecker 1837c68af6eSAvi Kivityconfig HAVE_USER_RETURN_NOTIFIER 1847c68af6eSAvi Kivity bool 185a1922ed6SIngo Molnar 186c01d4323SFrederic Weisbeckerconfig HAVE_PERF_EVENTS_NMI 187c01d4323SFrederic Weisbecker bool 18823637d47SFrederic Weisbecker help 18923637d47SFrederic Weisbecker System hardware can generate an NMI using the perf event 19023637d47SFrederic Weisbecker subsystem. Also has support for calculating CPU cycle events 19123637d47SFrederic Weisbecker to determine how many clock cycles in a given period. 192c01d4323SFrederic Weisbecker 193bf5438fcSJason Baronconfig HAVE_ARCH_JUMP_LABEL 194bf5438fcSJason Baron bool 195bf5438fcSJason Baron 196335d7afbSGerald Schaeferconfig HAVE_ARCH_MUTEX_CPU_RELAX 197335d7afbSGerald Schaefer bool 198335d7afbSGerald Schaefer 19926723911SPeter Zijlstraconfig HAVE_RCU_TABLE_FREE 20026723911SPeter Zijlstra bool 20126723911SPeter Zijlstra 202df013ffbSHuang Yingconfig ARCH_HAVE_NMI_SAFE_CMPXCHG 203df013ffbSHuang Ying bool 204df013ffbSHuang Ying 20543570fd2SHeiko Carstensconfig HAVE_ALIGNED_STRUCT_PAGE 20643570fd2SHeiko Carstens bool 20743570fd2SHeiko Carstens help 20843570fd2SHeiko Carstens This makes sure that struct pages are double word aligned and that 20943570fd2SHeiko Carstens e.g. the SLUB allocator can perform double word atomic operations 21043570fd2SHeiko Carstens on a struct page for better performance. However selecting this 21143570fd2SHeiko Carstens might increase the size of a struct page by a word. 21243570fd2SHeiko Carstens 2134156153cSHeiko Carstensconfig HAVE_CMPXCHG_LOCAL 2144156153cSHeiko Carstens bool 2154156153cSHeiko Carstens 2162565409fSHeiko Carstensconfig HAVE_CMPXCHG_DOUBLE 2172565409fSHeiko Carstens bool 2182565409fSHeiko Carstens 2192521f2c2SPeter Oberparleitersource "kernel/gcov/Kconfig" 220