On Wed, 1 Apr 2026 12:15:41 +0900 Masami Hiramatsu (Google) <[email protected]> wrote:
> > > +It is also possible to record trace data at system boot time by > > > specifying > > > +events with the persistent ring buffer, but in this case the data before > > > the > > > +reboot will be lost before it can be read. This problem can be solved by > > > a > > > +backup instance. From the kernel command line:: > > > + > > > + reserve_mem=12M:4096:trace trace_instance=boot_map@trace,sched,irq > > > trace_instance=backup=boot_map > > > > The above didn't actually work well without my patch to enable events on > > the persistent ring buffer with the backup. But keep it, as it will work > > with my patch ;-) > > Ah, thanks! > Let me rebase on it. Well, my patch hasn't been added yet ;-) But don't change anything. When this goes upstream both patches should have been applied. -- Steve
