Hello Steve!
On 01.07.2025 20:04, Steven Rostedt wrote:
> From: Namhyung Kim <namhyung@xxxxxxxxxx>
>
> Add a new event type for deferred callchains and a new callback for the
> struct perf_tool. For now it doesn't actually handle the deferred
> callchains but it just marks the sample if it has the PERF_CONTEXT_
> USER_DEFFERED in the callchain array.
> diff --git a/tools/lib/perf/include/perf/event.h b/tools/lib/perf/include/perf/event.h
> @@ -151,6 +151,12 @@ struct perf_record_switch {
> __u32 next_prev_tid;
> };
>
> +struct perf_record_callchain_deferred {
> + struct perf_event_header header;
At minimum the timestamp field added to perf with "[PATCH v12 07/11]
perf: Support deferred user callchains for per CPU events" needs to be
added here as well:
__u64 timestamp;
Otherwise this and any subsequent enhancements of the perf tools do no
longer work at all. But probably the timestamp field also needs to be
used for some purpose?
> + __u64 nr;
> + __u64 ips[];
> +};
> +
Thanks and regards,
Jens
--
Jens Remus
Linux on Z Development (D3303)
+49-7031-16-1128 Office
jremus@xxxxxxxxxx
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