Re: [PATCH perf-tools-next v7 0/6] perf ftrace: Support inlined functions and display enhancements in function graph tracer

[Aaron Tomlin]

On Sat, Oct 17, 2026 at 10:13:40PM -0400, Aaron Tomlin wrote:
> 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 (such as the scheduler,
> memory management, locking primitives, and RCU).
> 
> 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
> (e.g. /* <-wake_up_new_task+0x1d1/0x3e0 */). By interrogating DWARF debug
> information from the kernel image (vmlinux) utilising libdw, perf ftrace
> resolves this return address to its inlined callchain and synthesises the
> intermediate inlined frames directly into the streamed call graph.
> 
> This patch series addresses these challenges through six focused commits:

This does not apply against perf-tools-next/perf-tools-next. Kindly ignore.

-- 
Aaron Tomlin