Em Tue, Jan 26, 2016 at 04:00:56PM +0200, Adrian Hunter escreveu: > On 26/01/16 15:54, Arnaldo Carvalho de Melo wrote: > > [acme@ssdandy linux]$
> > So, this needs: > > 1) A machine that supports Intel PT > > 2) A kernel that supports Intel PT > > 3) A kernel that doesn't have perf_event_attr.context_switch, so that it > > tries > > to use sched:sched_switch > > 4) an unreadable tracefs > > What was the kernel where you stumbled on this problem? What machine? > Kernel was v4.2, machine was Broadwell. > context_switch was added in v4.3 I think, and PT was v4.1 > so I guess v4.1 and v4.2 are affected. Thanks for the info, my new main machine is a t450s, so Broadwell, will boot with 4.1/4.2. - Arnaldo
