On Tue, 31 Jan 2023 08:22:45 +0100 (CET) Richard Weinberger <rich...@nod.at> wrote:
> ----- Ursprüngliche Mail ----- > > Von: "Anton Ivanov" <anton.iva...@kot-begemot.co.uk> > > On 31/01/2023 04:17, Glenn Washburn wrote: > >> I'm trying to use the ftrace facility within UML. It appears as > >> though it exists in the menuconfig, but I can't seem to get the > >> kernel to recognize the tracefs filesystem. I'm wondering if > >> someone can confirm that either ftrace does or does not work in > >> UML. > > > > I have not used it. We have not had any requests related to it > > either > > > > I will look into it. > > Tracing itself should work. But function tracing is not supported. > You'll get tracefs as soon you select one tracer (such as > CONFIG_IRQSOFF_TRACER). Okay, that makes sense. Yes, I was really asking about function tracing. > Adding function (and function graph) tracing to UML is possible but a > bit of work. You need to find a way to implement all of ftraces > mcount hooks for UML. Sounds like more than I want to invest at this point. I'll get on without it for the time being. Thanks for the confirmation. Glenn _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um
