Re: [PATCH v6 3/6] perf record: Add --call-graph fp,defer option for deferred callchains

[Namhyung Kim]

Hello,

On Fri, Nov 21, 2025 at 07:26:34AM +0100, Thomas Richter wrote:
> On 11/21/25 00:48, Namhyung Kim wrote:
> > Add a new callchain record mode option for deferred callchains.  For now
> > it only works with FP (frame-pointer) mode.
> > 
> > And add the missing feature detection logic to clear the flag on old
> > kernels.
> > 
> >   $ perf record --call-graph fp,defer -vv true
> 
> Does this also works for dwarf format?
>     # perf record --call-graph dwarf,defer ....

No, it's not supported.  Maybe we can do similar just to dump stack
content and registers for dwarf before returning to user.

Thanks,
Namhyung