diff options
Diffstat (limited to 'arch/Kconfig')
| -rw-r--r-- | arch/Kconfig | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index 4877a8c..8bf0fa65 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -32,8 +32,9 @@ config HAVE_OPROFILE config KPROBES bool "Kprobes" - depends on KALLSYMS && MODULES + depends on MODULES depends on HAVE_KPROBES + select KALLSYMS help Kprobes allows you to trap at almost any kernel address and execute a callback function. register_kprobe() establishes @@ -41,11 +42,24 @@ config KPROBES for kernel debugging, non-intrusive instrumentation and testing. If in doubt, say "N". +config JUMP_LABEL + bool "Optimize trace point call sites" + depends on HAVE_ARCH_JUMP_LABEL + help + If it is detected that the compiler has support for "asm goto", + the kernel will compile trace point locations with just a + nop instruction. When trace points are enabled, the nop will + be converted to a jump to the trace function. This technique + lowers overhead and stress on the branch prediction of the + processor. + + On i386, options added to the compiler flags may increase + the size of the kernel slightly. + config OPTPROBES def_bool y depends on KPROBES && HAVE_OPTPROBES depends on !PREEMPT - select KALLSYMS_ALL config HAVE_EFFICIENT_UNALIGNED_ACCESS bool @@ -158,4 +172,7 @@ config HAVE_PERF_EVENTS_NMI subsystem. Also has support for calculating CPU cycle events to determine how many clock cycles in a given period. +config HAVE_ARCH_JUMP_LABEL + bool + source "kernel/gcov/Kconfig" |
