On Thu, Jul 06, 2017 at 04:41:30PM -0300, Arnaldo Carvalho de Melo wrote: > Em Wed, Jul 05, 2017 at 06:48:08PM -0700, Krister Johansen escreveu: > > Teach perf how to resolve symbols from binaries that are in a different > > mount namespace from the tool. This allows perf to generate meaningful > > stack traces even if the binary resides in a different mount namespace > > from the tool. > > I was trying to find a way to test after applying each of the patches in > this series, when it ocurred to me that if a process that appears on a > perf.data file has exit, how can we access /proc/%ITS_PID/something?
You're correct. We can't access /proc/<PID>/whatever once the process has exited. That was the impeteus for patches 4 and 6, which allow us to capture the binary (and debuginfo, if it exists) into the buildid cache so that if we do have a trace that exists after a process or container exists, we'll still be able to resolve some of the symbols. -K
