如何在每个样本中从分析器中获取完整的堆栈转储以用于火焰图? [英] How to get complete stack dump from profiler in every sample for use in flame graph?

问题描述

我非常喜欢 火焰图 用于分析，因为它将有助于消除不需要的函数调用.然而，有一个问题，它需要分析器在每次收集样本时进行完整的堆栈转储.这可以通过 DTrace 或 SystemTap 轻松完成，但我需要能够在运行 ubuntu(消除 DTrace)的 ARM 设备上执行此操作.我也想在不重新编译内核的情况下做到这一点(它消除了 SystemTap).

I really like the idea of the Flame Graph for profiling since it will help in eliminating unneeded function calls. There is a catch however in that it requires the profiler to do a complete stack dump each time it collects a sample. This can be accomplished with DTrace or SystemTap quite easily, but I need to be able to do this on an ARM device running ubuntu (which eliminates DTrace). I would also like to do this without recompiling the kernel (which eliminates SystemTap).

是否可以让 Valgrind/Callgrind 或 OProfile(或其他一些可以在 Ubuntu 的 ARM 设备上运行的分析工具)输出类似于:
dtrace -n 'profile-1001/pid == 12345 &&arg1/{ @[ustack()] = count();}

Is it possible to get Valgrind/Callgrind or OProfile (or some other profiling tool that can run on an ARM device in Ubuntu) to output something similar to:
dtrace -n 'profile-1001 /pid == 12345 && arg1/ { @[ustack()] = count(); }

推荐答案

尝试 Linux perf_events(又名perf"命令)，它是主线 Linux 内核的一部分，通常通过 linux-tools-common(或类似)包.我经常用它在 Linux 上创建火焰图.

Try Linux perf_events (aka the "perf" command), which is part of the mainline Linux kernel, and usually installed via the linux-tools-common (or similar) package. I often use it to create flame graphs on Linux.

我写了一些使用 perf 创建火焰图的说明:http://www.brendangregg.com/perf.html#FlameGraphs

I wrote up some instructions for creating flame graphs with perf on: http://www.brendangregg.com/perf.html#FlameGraphs

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