Monitoring In Linux

in any form or by any means- ele troni , me hani al, photo opying, or otherwise- for prot or ommer ial advantage. It may be reprinted, stored or distributed for a non- prot, edu ational or resear h purpose, given that its sour e of origin and this noti e are retained. Any questions on erning the use of this thesis for prot or ommer ial advantage should be addressed to the author. The opinions and on lusions stated in this thesis are expressing the author. They should not be onsidered as a pronoun ement of the National Te hni al University of Athens. Abstra t Pro essor hardware performan e ounters have improved in quality and features in re ent years. At the same time, the performan e monitoring support in Linux has been signi antly revamped with the development of the perf_events subsystem. Those fa tors on ur in making performan e monitoring a more ommon pra ti e among developers. However, no performan e analysis is possible without reliable hardware ounter data. In this thesis, we fo us on a published orre tness erratum in the performan e monitoring unit of re ent Intel pro essors when Hyper-Threading is enabled. Thi