Hi - > > Whether one uses systemtap, raw kprobes, or some specialized > > tracing/stats-collecting patch surely forthcoming, kernel-level APIs > > would be needed to perform fine-grained kernel-scope measurements > > using these counters. > > No, there's not need to add kernel bloat for performance monitoring. > This kind of stuff shoul dabsolutely be done from userspace.
Userspace measurements provide only large-grained quantities. Can you argue convincingly that there is never a need to measure focused quantities such as cache behaviors of individual subsystems, branch prediction statistics of a new algorithm? That running system-level benchmarks is the most efficient way for developers to assess their changes? That the scheduler would not benefit from access to HT resource utilization statistics? All these sorts of efforts seem to require a kernel-side perfmon API. - FChE _______________________________________________ perfmon mailing list [email protected] http://www.hpl.hp.com/hosted/linux/mail-archives/perfmon/
