Re: [PATCH 16/18] perf tools: Synthesize bpf_trampoline/dispatcher ksymbol event
From: Song Liu <song@kernel.org>
Date: 2020-02-27 05:50:45
Also in:
bpf
On Wed, Feb 26, 2020 at 5:06 AM Jiri Olsa [off-list ref] wrote:
Synthesize bpf images (trampolines/dispatchers) on start,
as ksymbol events from /proc/kallsyms. Having this perf
can recognize samples from those images and perf report
and top shows them correctly.
The rest of the ksymbol handling is already in place from
for the bpf programs monitoring, so only the initial state
was needed.
perf report output:
# Overhead Command Shared Object Symbol
12.37% test_progs [kernel.vmlinux] [k] entry_SYSCALL_64
11.80% test_progs [kernel.vmlinux] [k] syscall_return_via_sysret
9.63% test_progs bpf_prog_bcf7977d3b93787c_prog2 [k] bpf_prog_bcf7977d3b93787c_prog2
6.90% test_progs bpf_trampoline_24456 [k] bpf_trampoline_24456
6.36% test_progs [kernel.vmlinux] [k] memcpy_erms
Signed-off-by: Jiri Olsa <jolsa@kernel.org>Acked-by: Song Liu <redacted>