On Tue, Jan 03, 2017 at 01:00:29AM -0800, Andi Kleen wrote:SNIP> + len = grab_bb(buffer, start, end,> + machine, thread, &x.is64bit,> + &x.cpumode);> + /* Patch up missing kernel transfers due to ring filters */could you please provide more details on those ring filters? never heard of..thanks,jirka