On a fresh Xenial/arm64 installation:
$ uname -r
4.4.0-141-generic
$ uname -m
aarch64
$ dpkg -S $(which perf)
linux-tools-common: /usr/bin/perf
$ dpkg --get-selections | grep linux-tools
linux-tools-4.4.0-141 install
linux-tools-4.4.0-141-generic install
linux-tools-common install
linux-tools-generic install
$ sudo perf record -a -- sleep 10
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.131 MB perf.data (626 samples) ]
followed by:
$ sudo perf report
i see the captured samples:
42.22% swapper [kernel.kallsyms] [k] arch_cpu_idle
▒
5.10% tmux [kernel.kallsyms] [k] copy_page
◆
1.37% tmux libc-2.23.so [.] 0x000000000006e680
▒
1.37% tmux tmux [.] 0x0000000000028684
▒
1.37% tmux libc-2.23.so [.] strcmp
▒
1.35% swapper [kernel.kallsyms] [k] tick_nohz_idle_enter
▒
1.23% tmux tmux [.] 0x00000000000355dc
▒
1.05% sh [kernel.kallsyms] [k] handle_mm_fault
▒
1.01% tmux [kernel.kallsyms] [k] filemap_map_pages
▒
1.01% swapper [kernel.kallsyms] [k] _raw_spin_unlock_irqrestore
▒
0.96% tmux libc-2.23.so [.] free
but when i try to inspect a kernel function:
Annotate filemap_map_pages
◆
Zoom into sh(5304) thread
▒
Zoom into [kernel.kallsyms] DSO
▒Annotate filemap_map_pages
◆
Zoom into sh(5304) thread
▒
Zoom into [kernel.kallsyms] DSO
▒
Browse map details
▒
Zoom into Processor Socket 0
▒
Run scripts for samples of thread [sh]
▒
Run scripts for samples of symbol [filemap_map_pages]
▒
Run scripts for all samples
▒
Switch to another data file in PWD
▒
Exit
Browse map details
▒
Zoom into Processor Socket 0
▒
Run scripts for samples of thread [sh]
▒
Run scripts for samples of symbol [filemap_map_pages]
▒
Run scripts for all samples
▒
Switch to another data file in PWD
▒
Exit
i then select the Annotate option, and i get an empty screen - while on
x86, i correctly see the assembly of the queried function.
Same happens on Bionic/arm64.
** Changed in: linux (Ubuntu)
Status: Expired => Confirmed
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https://bugs.launchpad.net/bugs/1675949
Title:
perf report can't annotate kernel and dbgsym package has wrong
addresses
Status in linux package in Ubuntu:
Confirmed
Bug description:
Running zesty 4.10.0-13-generic kernel and running:
$ perf record
followed by
$ perf report
results in output that can't be annotated (even when run as root). The
following message appears:
Couldn't annotate do_io_submit:
No vmlinux file with build id 81ba79d482fa9e3ea58486de8f119b27fe6db55e
was found in the path.
Note that annotation using /proc/kcore requires CAP_SYS_RAWIO
capability.
Please use:
perf buildid-cache -vu vmlinux
Note this is being run as root and /proc/kcore is accessible with dd from the
same shell:
$ dd if=/proc/kcore bs=8 count=16 | hexdump
0000000 457f 464c 0102 0001 0000 0000 0000 0000
0000010 0004 00b7 0001 0000 0000 0000 0000 0000
0000020 0040 0000 0000 0000 0000 0000 0000 0000
0000030 0000 0000 0040 0038 0003 0000 0000 0000
0000040 0004 0000 0000 0000 00e8 0000 0000 0000
Additionally, installing the linux-image-4.10.0-13-generic-dbgsym
actually hurts the situation because the symbol addresses in the
dbgsym don't match the kernel addresses.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1675949/+subscriptions
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