On Thu, 8 May 2014, Dave Hansen wrote: You forgot to cc Steven :)
> I noticed on some of my systems that page fault tracing doesn't work: > > cd /sys/kernel/debug/tracing > echo 1 > events/exceptions/enable > cat trace; > # nothing shows up > > I eventually traced it down to CONFIG_KVM_GUEST. At least in a KVM VM, > enabling that option breaks page fault tracing, and disabling fixes it. > I tried on some old kernels and this does not appear to be a > regression: it never worked. > > Anybody have any theories about what is going on? > > I'm also having problems with the page fault tracing on bare metal (same > symptom of no trace output). I'm unsure if it's related. > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
