I knew that "perf" tool requires installation correspond to specific linux kernel versions. And I knew that all docker images run with the same linux kernel version, no matter linux distribution version.
I'm using ubuntu 16.04 inside docker and already installed linux-tools-common, start perf tell me I still lack some packages:'
# perf
/usr/bin/perf: line 32: lsb_release: command not found
WARNING: perf not found for kernel 4.9.12
You may need to install the following packages for this specific kernel:
linux-tools-4.9.12-moby
linux-cloud-tools-4.9.12-moby
You may also want to install one of the following packages to keep up to date:
linux-tools-moby
linux-cloud-tools-moby
Then I tried to install what I missed:
root@xxxxxx:/# apt-get install linux-tools-4.9.12-moby linux-cloud-tools-4.9.12-moby
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package linux-tools-4.9.12-moby
E: Couldn't find any package by glob 'linux-tools-4.9.12-moby'
E: Couldn't find any package by regex 'linux-tools-4.9.12-moby'
E: Unable to locate package linux-cloud-tools-4.9.12-moby
E: Couldn't find any package by glob 'linux-cloud-tools-4.9.12-moby'
E: Couldn't find any package by regex 'linux-cloud-tools-4.9.12-moby'
root@b2543b6e985d:/# apt-get install linux-tools-moby linux-cloud-tools-moby
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package linux-tools-moby
E: Unable to locate package linux-cloud-tools-moby
(1) So weird, but how to solve this installation problem?
(2) Plus: I'm still confused, if there's no strict match between "perf" and "kernel", how could "perf" work well inside docker of linux?
I knew that "perf" tool requires installation correspond to specific linux kernel versions. And I knew that all docker images run with the same linux kernel version, no matter linux distribution version.
Perf tool from other version of kernel still can be used (the syscalls in perf_event subsystem have good design and are compatible with older/newer tools). So, you can just find any perf binary (not the /usr/bin/perf script) anywhere, check its library depends with (ldd ..path_to_perf/perf) and copy perf inside Docker (and install libs).
Usage of hardware events, system-wide or kernel profiling may be limited in the docker, so try
perf -e cycles:u ./program (hardware counter only for user-space), perf -e task-clock ./program (software timer for kernel and user-space), perf -e task-clock:u ./program (software timer for user-space only),