On Mon, 17 Apr 2017 20:32:50 +0200 Thomas Gleixner <[email protected]> wrote:
> The timer pull logic needs proper debuging aids. Add tracepoints so the > hierarchical idle machinery can be diagnosed. > > Signed-off-by: Anna-Maria Gleixner <[email protected]> > Signed-off-by: Thomas Gleixner <[email protected]> > --- > include/trace/events/timer_migration.h | 173 > +++++++++++++++++++++++++++++++++ > kernel/time/timer_migration.c | 17 +++ > 2 files changed, 190 insertions(+) > > --- /dev/null > +++ b/include/trace/events/timer_migration.h > @@ -0,0 +1,173 @@ > +#undef TRACE_SYSTEM > +#define TRACE_SYSTEM timer_migration > + > +#if !defined(_TRACE_TIMER_MIGRATION_H) || defined(TRACE_HEADER_MULTI_READ) > +#define _TRACE_TIMER_MIGRATION_H > + > +#include <linux/tracepoint.h> > + > +/* Group events */ > +DECLARE_EVENT_CLASS(tmigr_group, > + > + TP_PROTO(struct tmigr_group *group), > + > + TP_ARGS(group), > + > + TP_STRUCT__entry( > + __field( void *, group ) > + __field( unsigned int, lvl ) > + __field( unsigned int, numa_node ) > + __field( unsigned int, active ) > + __field( unsigned int, migrator ) > + __field( unsigned int, num_childs ) > + __field( void *, parent ) > + __field( u64, nextevt ) > + __field( unsigned int, evtcpu ) On 64 bit boxes, with long and pointers as 8 bytes and int is only 4 bytes, the above can be laid out better, as the above structure will most likely create holes. Like a 4 byte one after num_childs. Perhaps move num_childs down to above evtcpu. In other words, please pair ints together when possible, between pointers and longs. The order of the struct does not need to be the same as the order of the output. Thanks, -- Steve > + ), > + > + TP_fast_assign( > + __entry->group = group; > + __entry->lvl = group->level; > + __entry->numa_node = group->numa_node; > + __entry->active = group->active; > + __entry->migrator = group->migrator; > + __entry->num_childs = group->num_childs; > + __entry->parent = group->parent; > + __entry->nextevt = group->groupevt.nextevt.expires; > + __entry->evtcpu = group->groupevt.cpu; > + ), > + > + TP_printk("group=%p lvl=%d numa=%d active=%d migrator=%d num_childs=%d " > + "parent=%p nextevt=%llu evtcpu=%d", > + __entry->group, __entry->lvl, __entry->numa_node, > + __entry->active, __entry->migrator, __entry->num_childs, > + __entry->parent, __entry->nextevt, __entry->evtcpu) > +); > +
