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Diffstat (limited to 'Documentation/trace/kprobes.rst')
| -rw-r--r-- | Documentation/trace/kprobes.rst | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/Documentation/trace/kprobes.rst b/Documentation/trace/kprobes.rst index f318bceda1e6..e1636e579c9c 100644 --- a/Documentation/trace/kprobes.rst +++ b/Documentation/trace/kprobes.rst @@ -4,7 +4,7 @@ Kernel Probes (Kprobes) :Author: Jim Keniston <jkenisto@us.ibm.com> :Author: Prasanna S Panchamukhi <prasanna.panchamukhi@gmail.com> -:Author: Masami Hiramatsu <mhiramat@redhat.com> +:Author: Masami Hiramatsu <mhiramat@kernel.org> .. CONTENTS @@ -131,8 +131,7 @@ For example, if the function is non-recursive and is called with a spinlock held, maxactive = 1 should be enough. If the function is non-recursive and can never relinquish the CPU (e.g., via a semaphore or preemption), NR_CPUS should be enough. If maxactive <= 0, it is -set to a default value. If CONFIG_PREEMPT is enabled, the default -is max(10, 2*NR_CPUS). Otherwise, the default is NR_CPUS. +set to a default value: max(10, 2*NR_CPUS). It's not a disaster if you set maxactive too low; you'll just miss some probes. In the kretprobe struct, the nmissed field is set to @@ -316,20 +315,20 @@ architectures: - i386 (Supports jump optimization) - x86_64 (AMD-64, EM64T) (Supports jump optimization) - ppc64 -- ia64 (Does not support probes on instruction slot1.) - sparc64 (Return probes not yet implemented.) - arm - ppc - mips - s390 - parisc +- loongarch Configuring Kprobes =================== When configuring the kernel using make menuconfig/xconfig/oldconfig, -ensure that CONFIG_KPROBES is set to "y". Under "General setup", look -for "Kprobes". +ensure that CONFIG_KPROBES is set to "y", look for "Kprobes" under +"General architecture-dependent options". So that you can load and unload Kprobes-based instrumentation modules, make sure "Loadable module support" (CONFIG_MODULES) and "Module |