限制 不同的function graph实例之间共享tracer_flags,也就是options/下面关于function graph的控制节点 可以创建的function grapher实例的数量目前最大支持16个
cmp x0, x2// if (ftrace_trace_functionb.eq skip_ftrace_call// != ftrace_stub) {mcount_get_pc x0// function's pcmcount_get_lr x1// function's lr (= parent's pc)blr x2// (*ftrace_trace_function)(pc, lr);#ifndef CONFIG_FUNCTION_GRAPH_TRACERskip_ftrace_call:// return;mcoun...
In addition, function arguments and return values can be saved and shown later. It supports multi-process and/or multi-threaded applications. With root privileges and if the kernel was built with CONFIG_FUNCTION_GRAPH_TRACER=y, kernel functions can be traced as well. How to build and install...
It supports multi-process and/or multi-threaded applications. With root privileges and if the kernel was built withCONFIG_FUNCTION_GRAPH_TRACER=y, kernel functions can be traced as well. How to build and install uftrace On Linux distros,misc/install-deps.shcan be used to install required softw...
echo"function">/sys/kernel/debug/tracing/current_tracer 在上述echo语句导致崩溃后重新启动时,我看到了大量输出,内容如下: 清除孤立的inode<inode> 我试图通过将current_tracer值从function_graph替换为C程序中的其他内容来重现这个问题: 代码语言:javascript ...
In addition, function arguments and return values can be saved and shown later. It supports multi-process and/or multi-threaded applications. With root privileges and if the kernel was built with CONFIG_FUNCTION_GRAPH_TRACER=y, kernel functions can be traced as well. How to build and install...
+Fprobe is a function entry/exit probe mechanism based on the function-graph +tracer. +Instead of tracing all functions, if you want to attach callbacks on specific +function entry and exit, similar to the kprobes and kretprobes, you can ...
b.ne ftrace_graph_caller // ftrace_graph_caller(); mcount_exit #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ ENDPROC(_mcount) #else /* CONFIG_DYNAMIC_FTRACE */ 对应的伪代码如下: void _mcount(void) { /* save any bare state needed in order to do initial checking */ ...
mcount_get_lr x1 // function's lr (= parent's pc) blr x2 // (*ftrace_trace_function)(pc, lr);#ifndef CONFIG_FUNCTION_GRAPH_TRACERskip_ftrace_call: // return; mcount_exit // }#else mcount_exit // return; // }skip_ftrace_call: adrp x1, ftrace_graph_return ldr x2, [x1,...
With root privilege, it can also trace kernel functions as well( with -k option) if the system enables the function graph tracer in the kernel (CONFIG_FUNCTION_GRAPH_TRACER=y). How to build and install uftrace On Linux distros, misc/install-deps.sh installs required software(s) on your ...