On Wed, Mar 27, 2013 at 03:20:14PM +0100, Peter Zijlstra wrote: > On Wed, 2013-03-27 at 15:14 +0100, Jiri Olsa wrote: > > we have correct cpumode for sample->ip, but I think it's the > > PEBS->dla (sample->addr) where we need to guess.. right? > > kernel mode very much fakes the cpumode/segment stuff for PEBS. PEBS > assumes you're running in a linear/flat mode. >
say we hit the sample when kernel accesses the user data, we will endup with IP in kernel space and DATA ptr in user space.. in theory ;-) and that would need the cpumode guessing for DATA ptr, because cpumode value is deduced from cs register jirka -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
