Re: [PATCH 24/24] perf record: Add --buildid-mmap option to enable mmap's build id

[Jiri Olsa]

On Wed, Nov 11, 2020 at 09:00:46AM -0800, Andi Kleen wrote:
> On Mon, Nov 09, 2020 at 10:54:15PM +0100, Jiri Olsa wrote:
> > Adding --buildid-mmap option to enable build id in mmap2 events.
> > It will only work if there's kernel support for that and it disables
> > build id cache (implies --no-buildid).
> 
> What's the point of the option? Why not enable it by default
> if the kernel supports it?
> 
> With the option most user won't get the benefit.
> 
> The only reason I can think of for an option would be to disable
> so that old tools can still process.

yes, that was request in the rfc post, we want the new default
perf.data be still readable by older perf tools

jirka