问题
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).
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(); }
回答1:
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.
I wrote up some instructions for creating flame graphs with perf on: http://www.brendangregg.com/perf.html#FlameGraphs
回答2:
pstack was suggested by Mike Dunlavey which unfortunately segfaults after I apply the ARM patch and run it on an ARM device. Until I have time to take a look at it, I found the following stopgap solution:
http://www.commandlinefu.com/commands/view/4039/print-stack-trace-of-a-core-file-without-needing-to-enter-gdb-interactively
It uses gdb with the following command: gdb --q --n --ex bt --batch --pid PID
A bit slow but works.
来源：https://stackoverflow.com/questions/10333376/how-to-get-complete-stack-dump-from-profiler-in-every-sample-for-use-in-flame-gr