| Kconfig (175ae3ad59ab3459652bd2ae3bbc1785aeba1bf3) | Kconfig (e5a971d76d701dbff9e5dbaa84dc9e8c3081a867) |
|---|---|
| 1# SPDX-License-Identifier: GPL-2.0-only 2# 3# Architectures that offer an FUNCTION_TRACER implementation should 4# select HAVE_FUNCTION_TRACER: 5# 6 7config USER_STACKTRACE_SUPPORT 8 bool --- 144 unchanged lines hidden (view full) --- 153config FUNCTION_TRACER 154 bool "Kernel Function Tracer" 155 depends on HAVE_FUNCTION_TRACER 156 select KALLSYMS 157 select GENERIC_TRACER 158 select CONTEXT_SWITCH_TRACER 159 select GLOB 160 select TASKS_RCU if PREEMPTION | 1# SPDX-License-Identifier: GPL-2.0-only 2# 3# Architectures that offer an FUNCTION_TRACER implementation should 4# select HAVE_FUNCTION_TRACER: 5# 6 7config USER_STACKTRACE_SUPPORT 8 bool --- 144 unchanged lines hidden (view full) --- 153config FUNCTION_TRACER 154 bool "Kernel Function Tracer" 155 depends on HAVE_FUNCTION_TRACER 156 select KALLSYMS 157 select GENERIC_TRACER 158 select CONTEXT_SWITCH_TRACER 159 select GLOB 160 select TASKS_RCU if PREEMPTION |
| 161 select TASKS_RUDE_RCU |
|
| 161 help 162 Enable the kernel to trace every kernel function. This is done 163 by using a compiler feature to insert a small, 5-byte No-Operation 164 instruction at the beginning of every kernel function, which NOP 165 sequence is then dynamically patched into a tracer call when 166 tracing is enabled by the administrator. If it's runtime disabled 167 (the bootup default), then the overhead of the instructions is very 168 small and not measurable even in micro-benchmarks. --- 686 unchanged lines hidden --- | 162 help 163 Enable the kernel to trace every kernel function. This is done 164 by using a compiler feature to insert a small, 5-byte No-Operation 165 instruction at the beginning of every kernel function, which NOP 166 sequence is then dynamically patched into a tracer call when 167 tracing is enabled by the administrator. If it's runtime disabled 168 (the bootup default), then the overhead of the instructions is very 169 small and not measurable even in micro-benchmarks. --- 686 unchanged lines hidden --- |