perf stat: Support old kernels for bperf cgroup counting

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The recent change in the cgroup will break the backward compatiblity in
the BPF program.  It should support both old and new kernels using BPF
CO-RE technique.

Like the task_struct->__state handling in the offcpu analysis, we can
check the field name in the cgroup struct.

Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Namhyung Kim 2022-10-10 22:28:08 -07:00 • committed by Tejun Heo

parent 35256d673a

commit 8248fe4132

1 changed files with 28 additions and 1 deletions

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tools/perf/util/bpf_skel/bperf_cgroup.bpf.c

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