Re: [PATCH perf-tools-next v11 06/10] perf ftrace: Support display of inlined functions in function graph tracer

[sashiko-bot@kernel.org]

> The Linux kernel's function graph tracer operates at the machine
> instruction level via compiler instrumentation
> (-fpatchable-function-entry), recording entry and return events for
> physical function calls. Consequently, functions inlined by the compiler
> are invisible in the resulting call graph, as no discrete call or return
> instructions are emitted for them. While technically expected, this
> omission frequently obscures the logical execution flow when analysing
> kernel subsystems heavily reliant upon inlining.
> 
> Address this by introducing the --inline option to perf ftrace for the
> function_graph tracer.
> 
> When the kernel is configured with CONFIG_FUNCTION_GRAPH_RETADDR=y, the
> funcgraph-retaddr trace option records the caller's return address on
> each function entry, manifested in the trace stream as a comment
> [ ... ]
>         tools/perf/Documentation/perf-ftrace.txt.
> 
> Tested-by: Ian Rogers <irogers@google.com>
> Reviewed-by: Ian Rogers <irogers@google.com>
> Signed-off-by: Aaron Tomlin <atomlin@atomlin.com>

Sashiko has reviewed this patch and found no issues.

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