After some investigation, I found this:
If I use the perf executable from the package linux-tools-4.15.0-55-generic
along with the Linux kernel 5.0.0-23-generic from the package
linux-image-5.0.0-23-generic , it works.
$ /usr/lib/linux-tools/4.15.0-55-generic/perf top -p `pidof top`
Samples: 134 of event 'cycles:ppp', Event count (approx.): 26218815
Overhead Shared Object Symbol
6.69% libc-2.27.so [.] _IO_vfscanf
4.01% [kernel] [k] entry_SYSCALL_64
3.71% [kernel] [k] do_syscall_64
3.36% [kernel] [k] num_to_str
3.25% libc-2.27.so [.] __GI_____strtoll_l_internal
2.54% [kernel] [k] syscall_return_via_sysret
2.35% [kernel] [k] __d_lookup
2.24% [kernel] [k] get_mem_cgroup_from_mm
2.22% libc-2.27.so [.] _IO_default_xsputn
1.84% libc-2.27.so [.] _IO_sputbackc
1.80% [kernel] [k] kmem_cache_free
1.77% [kernel] [k] bitmap_string.isra.2
1.72% [kernel] [k] render_sigset_t
1.65% [kernel] [k] __alloc_file
1.62% [kernel] [k] do_task_stat
1.57% [kernel] [k] number
So, the problem is really the executable /usr/lib/linux-hwe-tools-5.0.0-23/perf
which is in the package:
$ apt-file search /usr/lib/linux-hwe-tools-5.0.0-23/perf
linux-hwe-tools-5.0.0-23: /usr/lib/linux-hwe-tools-5.0.0-23/perf
$ dpkg -l|grep linux-hwe-tools-5.0.0-23|awk '{print $1, $2, $3, $4}'|column -t
ii linux-hwe-tools-5.0.0-23 5.0.0-23.24~18.04.1 amd64
According to
https://packages.ubuntu.com/bionic-updates/linux-hwe-cloud-tools-5.0.0-23 ,
the source package for linux-hwe-tools is linux-hwe.
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https://bugs.launchpad.net/bugs/1839852
Title:
perf broken on hwe kernel 5.0.0-23
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