Re: [PATCH] perf test: Record kcore for the CoreSight callchain test

[James Clark]

On 28/09/2026 10:06, Leo Yan wrote:
> The CoreSight callchain test traces both userspace and kernel execution
> and checks the callchain across a syscall.
>
> Add --kcore to perf record to save the running kernel image alongside
> the trace data so perf script can use it to decode the kernel trace.
>
> Add a Fixes tag so the change can be backported to stable kernels and
> improve the test reliability.
>
> Fixes: ca0e19074bd6 ("perf test: Add Arm CoreSight callchain test")
> Signed-off-by: Leo Yan <leo.yan@xxxxxxx>
> ---
>   tools/perf/tests/shell/coresight/callchain.sh | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/tests/shell/coresight/callchain.sh b/tools/perf/tests/shell/coresight/callchain.sh
> index 13cca7dc1118..b69187f1a37f 100755
> --- a/tools/perf/tests/shell/coresight/callchain.sh
> +++ b/tools/perf/tests/shell/coresight/callchain.sh
> @@ -43,7 +43,7 @@ record_trace()
>   
>   	mkfifo "$cf" "$af"
>   
> -	perf record -o "$data" -e cs_etm// --per-thread -D -1 --control fifo:"$cf","$af" -- \
> +	perf record --kcore -o "$data" -e cs_etm// --per-thread -D -1 --control fifo:"$cf","$af" -- \
>   		perf test --record-ctl fifo:"$cf","$af" -w callchain >/dev/null 2>&1 &&
>   
>   	# It is safe to use 'i3i' with a three-instruction interval, since the

Reviewed-by: James Clark <james.clark@xxxxxxxxxx>