On Thu, Jun 23, 2011 at 12:39:54PM -0700, Arun Sharma wrote: > On 6/23/11 7:22 AM, David Ahern wrote: > > >I have not seen issues like this using newer perf userspace against > >older kernels. For example, my laptop was running Fedora 14 (2.6.35) and > >now Fedora 15 (2.6.38.8) and I typically use latest perf builds (e.g., > >testing patches). > > I narrowed it down to PERF_SAMPLE_RAW: > > perf record -ag -- sleep 1 > > is fine, but: > > perf record -agR -- sleep 1 > > fails for me most of the time. The reason I needed to use the -R in > the first place is that "perf script" fails on older kernels with: > > Samples do not contain timestamps. > > With the newer perf, I don't get errors, but the timestamp field is > invalid. So I need to use the -R flag to get valid timestamps + > stacktraces out of "perf script".
I'm confused, you first said it happens with new tools on older kernel. Can you tell us which combination of kernel/user raises the error? and which error. Thanks! -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
