On Wed, Jan 07, 2015 at 05:13:49PM -0800, Sukadev Bhattiprolu wrote: > Description of "event parameters" from the documentation patch: > > Event parameters are a basic way for partial events to be specified in > sysfs with per-event names given to the fields that need to be filled in > when using a particular event. > > It is intended for supporting cases where the single 'cpu' parameter is > insufficient. For example, POWER 8 has events for physical > sockets/cores/cpus that are accessible from with virtual machines. To > keep using the single 'cpu' parameter we'd need to perform a mapping > between Linux's cpus and the physical machine's cpus (in this case > Linux is running under a hypervisor). This isn't possible because > bindings between our cpus and physical cpus may not be fixed, and we > probably won't have a "cpu" on each physical cpu. > > Description of the sysfs contents when events are parameterized (copied from > an > included patch): > > Examples: > > domain=0x1,offset=0x8,core=? > > In the case of the last example, a value replacing "?" would need > to be provided by the user selecting the particular event. This is > refered to as "event parameterization". All non-numerical values > indicate an event parameter. > > Notes on how perf-list displays parameterized events > > PARAMETERIZED EVENTS > -------------------- > > Some pmu events listed by 'perf list' will be displayed with '$xyz' in > them. For example: > > hv_24x7/HPM_THREAD_NAP_CCYC__PHYS_CORE,core=?/ > > This means that when provided as an event, a value for ? must also > be supplied. For example: > > perf stat -e \ > 'hv_24x7/HPM_THREAD_NAP_CCYC__PHYS_CORE,core=2' ... > > Changelog[v7] > [Jiri Olsa] Nit: Add braces for clarity. > [Jiri Olsa] Add a check to make sure that sysfs entries have with > parameters exactly match '=?'.
for the patchset: Acked-by: Jiri Olsa <jo...@kernel.org> thanks, jirka _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
