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Mon, 2 Nov 2026 16:27:37 +0000 Message-ID: Date: Mon, 2 Nov 2026 18:27:30 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/6] perf/x86/intel/pt: Stop tracing at syscore shutdown To: Andi Kleen CC: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , "Alexander Shishkin" , Jiri Olsa , Ian Rogers , James Clark , "Thomas Gleixner" , Borislav Petkov , Dave Hansen , , "H. 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Events are left in place, but record nothing more. >> + */ >> +static void pt_syscore_shutdown(void *data) >> +{ >> + WRITE_ONCE(pt_shutdown, true); >> + on_each_cpu(pt_shutdown_cpu, NULL, 1); > > I don't think adding more and more broadcast NMIs to the panic path > is a good idea. It's always a very big hammer and a risky operation > that risks breaking the actual dump. panic reallhy needs to be > simple and reliable, and this is the total opposite. Is pt_syscore_shutdown() called on a panic path? I can't find a way. > > KVM already does one at least (which I never liked either). At a > minimum please find a way to consolidate those into a single > one (as in have a notifier chain that is called on the target CPU). > > But better would be to not do this and find some other way. > > How about just passing the PT region as reserved and maybe free > it later after the target kernel had a chance to reinitialize all CPUs? Intel PT has cpu_emergency_stop_pt().