1fb32e03fSMathieu Desnoyers# 2fb32e03fSMathieu Desnoyers# General architecture dependent options 3fb32e03fSMathieu Desnoyers# 4125e5645SMathieu Desnoyers 5125e5645SMathieu Desnoyersconfig OPROFILE 6125e5645SMathieu Desnoyers tristate "OProfile system profiling (EXPERIMENTAL)" 7125e5645SMathieu Desnoyers depends on PROFILING 8125e5645SMathieu Desnoyers depends on HAVE_OPROFILE 940ada30fSIngo Molnar depends on TRACING_SUPPORT 10d69d59f4SIngo Molnar select TRACING 11d69d59f4SIngo Molnar select RING_BUFFER 129a5963ebSChristian Borntraeger select RING_BUFFER_ALLOW_SWAP 13125e5645SMathieu Desnoyers help 14125e5645SMathieu Desnoyers OProfile is a profiling system capable of profiling the 15125e5645SMathieu Desnoyers whole system, include the kernel, kernel modules, libraries, 16125e5645SMathieu Desnoyers and applications. 17125e5645SMathieu Desnoyers 18125e5645SMathieu Desnoyers If unsure, say N. 19125e5645SMathieu Desnoyers 20852402ccSRobert Richterconfig OPROFILE_IBS 21852402ccSRobert Richter bool "OProfile AMD IBS support (EXPERIMENTAL)" 22852402ccSRobert Richter default n 23852402ccSRobert Richter depends on OPROFILE && SMP && X86 24852402ccSRobert Richter help 25852402ccSRobert Richter Instruction-Based Sampling (IBS) is a new profiling 26852402ccSRobert Richter technique that provides rich, precise program performance 27852402ccSRobert Richter information. IBS is introduced by AMD Family10h processors 28ba8b453dSJesper Dangaard Brouer (AMD Opteron Quad-Core processor "Barcelona") to overcome 29852402ccSRobert Richter the limitations of conventional performance counter 30852402ccSRobert Richter sampling. 31852402ccSRobert Richter 32852402ccSRobert Richter If unsure, say N. 33852402ccSRobert Richter 344d4036e0SJason Yehconfig OPROFILE_EVENT_MULTIPLEX 354d4036e0SJason Yeh bool "OProfile multiplexing support (EXPERIMENTAL)" 364d4036e0SJason Yeh default n 374d4036e0SJason Yeh depends on OPROFILE && X86 384d4036e0SJason Yeh help 394d4036e0SJason Yeh The number of hardware counters is limited. The multiplexing 404d4036e0SJason Yeh feature enables OProfile to gather more events than counters 414d4036e0SJason Yeh are provided by the hardware. This is realized by switching 424d4036e0SJason Yeh between events at an user specified time interval. 434d4036e0SJason Yeh 444d4036e0SJason Yeh If unsure, say N. 454d4036e0SJason Yeh 46125e5645SMathieu Desnoyersconfig HAVE_OPROFILE 479ba16087SJan Beulich bool 48125e5645SMathieu Desnoyers 49125e5645SMathieu Desnoyersconfig KPROBES 50125e5645SMathieu Desnoyers bool "Kprobes" 51125e5645SMathieu Desnoyers depends on KALLSYMS && MODULES 52125e5645SMathieu Desnoyers depends on HAVE_KPROBES 53125e5645SMathieu Desnoyers help 54125e5645SMathieu Desnoyers Kprobes allows you to trap at almost any kernel address and 55125e5645SMathieu Desnoyers execute a callback function. register_kprobe() establishes 56125e5645SMathieu Desnoyers a probepoint and specifies the callback. Kprobes is useful 57125e5645SMathieu Desnoyers for kernel debugging, non-intrusive instrumentation and testing. 58125e5645SMathieu Desnoyers If in doubt, say "N". 59125e5645SMathieu Desnoyers 60*afd66255SMasami Hiramatsuconfig OPTPROBES 61*afd66255SMasami Hiramatsu bool "Kprobes jump optimization support (EXPERIMENTAL)" 62*afd66255SMasami Hiramatsu default y 63*afd66255SMasami Hiramatsu depends on KPROBES 64*afd66255SMasami Hiramatsu depends on !PREEMPT 65*afd66255SMasami Hiramatsu depends on HAVE_OPTPROBES 66*afd66255SMasami Hiramatsu select KALLSYMS_ALL 67*afd66255SMasami Hiramatsu help 68*afd66255SMasami Hiramatsu This option will allow kprobes to optimize breakpoint to 69*afd66255SMasami Hiramatsu a jump for reducing its overhead. 70*afd66255SMasami Hiramatsu 7158340a07SJohannes Bergconfig HAVE_EFFICIENT_UNALIGNED_ACCESS 729ba16087SJan Beulich bool 7358340a07SJohannes Berg help 7458340a07SJohannes Berg Some architectures are unable to perform unaligned accesses 7558340a07SJohannes Berg without the use of get_unaligned/put_unaligned. Others are 7658340a07SJohannes Berg unable to perform such accesses efficiently (e.g. trap on 7758340a07SJohannes Berg unaligned access and require fixing it up in the exception 7858340a07SJohannes Berg handler.) 7958340a07SJohannes Berg 8058340a07SJohannes Berg This symbol should be selected by an architecture if it can 8158340a07SJohannes Berg perform unaligned accesses efficiently to allow different 8258340a07SJohannes Berg code paths to be selected for these cases. Some network 8358340a07SJohannes Berg drivers, for example, could opt to not fix up alignment 8458340a07SJohannes Berg problems with received packets if doing so would not help 8558340a07SJohannes Berg much. 8658340a07SJohannes Berg 8758340a07SJohannes Berg See Documentation/unaligned-memory-access.txt for more 8858340a07SJohannes Berg information on the topic of unaligned memory accesses. 8958340a07SJohannes Berg 901a94bc34SHeiko Carstensconfig HAVE_SYSCALL_WRAPPERS 911a94bc34SHeiko Carstens bool 921a94bc34SHeiko Carstens 939edddaa2SAnanth N Mavinakayanahalliconfig KRETPROBES 949edddaa2SAnanth N Mavinakayanahalli def_bool y 959edddaa2SAnanth N Mavinakayanahalli depends on KPROBES && HAVE_KRETPROBES 969edddaa2SAnanth N Mavinakayanahalli 977c68af6eSAvi Kivityconfig USER_RETURN_NOTIFIER 987c68af6eSAvi Kivity bool 997c68af6eSAvi Kivity depends on HAVE_USER_RETURN_NOTIFIER 1007c68af6eSAvi Kivity help 1017c68af6eSAvi Kivity Provide a kernel-internal notification when a cpu is about to 1027c68af6eSAvi Kivity switch to user mode. 1037c68af6eSAvi Kivity 10428b2ee20SRik van Rielconfig HAVE_IOREMAP_PROT 1059ba16087SJan Beulich bool 10628b2ee20SRik van Riel 107125e5645SMathieu Desnoyersconfig HAVE_KPROBES 1089ba16087SJan Beulich bool 1099edddaa2SAnanth N Mavinakayanahalli 1109edddaa2SAnanth N Mavinakayanahalliconfig HAVE_KRETPROBES 1119ba16087SJan Beulich bool 11274bc7ceeSArthur Kepner 113*afd66255SMasami Hiramatsuconfig HAVE_OPTPROBES 114*afd66255SMasami Hiramatsu bool 1151f5a4ad9SRoland McGrath# 1161f5a4ad9SRoland McGrath# An arch should select this if it provides all these things: 1171f5a4ad9SRoland McGrath# 1181f5a4ad9SRoland McGrath# task_pt_regs() in asm/processor.h or asm/ptrace.h 1191f5a4ad9SRoland McGrath# arch_has_single_step() if there is hardware single-step support 1201f5a4ad9SRoland McGrath# arch_has_block_step() if there is hardware block-step support 1211f5a4ad9SRoland McGrath# asm/syscall.h supplying asm-generic/syscall.h interface 1221f5a4ad9SRoland McGrath# linux/regset.h user_regset interfaces 1231f5a4ad9SRoland McGrath# CORE_DUMP_USE_REGSET #define'd in linux/elf.h 1241f5a4ad9SRoland McGrath# TIF_SYSCALL_TRACE calls tracehook_report_syscall_{entry,exit} 1251f5a4ad9SRoland McGrath# TIF_NOTIFY_RESUME calls tracehook_notify_resume() 1261f5a4ad9SRoland McGrath# signal delivery calls tracehook_signal_handler() 1271f5a4ad9SRoland McGrath# 1281f5a4ad9SRoland McGrathconfig HAVE_ARCH_TRACEHOOK 1299ba16087SJan Beulich bool 1301f5a4ad9SRoland McGrath 13174bc7ceeSArthur Kepnerconfig HAVE_DMA_ATTRS 1329ba16087SJan Beulich bool 1333d442233SJens Axboe 1343d442233SJens Axboeconfig USE_GENERIC_SMP_HELPERS 1359ba16087SJan Beulich bool 1369483a578SDavid Brownell 1379483a578SDavid Brownellconfig HAVE_CLK 1389ba16087SJan Beulich bool 1399483a578SDavid Brownell help 1409483a578SDavid Brownell The <linux/clk.h> calls support software clock gating and 1419483a578SDavid Brownell thus are a key power management tool on many systems. 1429483a578SDavid Brownell 1435ee00bd4SJoerg Roedelconfig HAVE_DMA_API_DEBUG 1445ee00bd4SJoerg Roedel bool 14536cd3c9fSHeiko Carstens 14636cd3c9fSHeiko Carstensconfig HAVE_DEFAULT_NO_SPIN_MUTEXES 14736cd3c9fSHeiko Carstens bool 14862a038d3SK.Prasad 14962a038d3SK.Prasadconfig HAVE_HW_BREAKPOINT 15062a038d3SK.Prasad bool 15199e8c5a3SFrederic Weisbecker depends on PERF_EVENTS 15262a038d3SK.Prasad 1537c68af6eSAvi Kivityconfig HAVE_USER_RETURN_NOTIFIER 1547c68af6eSAvi Kivity bool 155a1922ed6SIngo Molnar 1562521f2c2SPeter Oberparleitersource "kernel/gcov/Kconfig" 157