[dabreegster]

Does anybody have working instructions to build a patched perf for Ubuntu 20.04? I built from kernel.org following https://michcioperz.com/post/slow-perf-script/, but somehow flamegraph pointed at the new build breaks totally -- after exiting the app, there's no "perf record: Woken up 181 times to write data" message; it just hangs.

[tonyg]

Note that the patch does something other than what Michał's post ends up doing: instead of linking libbfd, it replaces lots of calls to addr2line with a single long-running call to addr2line.

If you want to try the patch on Ubuntu, I recommend using the Debianish technique of "apt source linux-perf-5.10" (or whichever version of the kernel you're running) and applying the patch. Then "make" in the tools/perf directory, and it should work...