----- 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). 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. Thanks, //richard _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um
