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SMP: Add and use lock statistics helper

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This commit is contained in:
Sebastian Huber
2016-05-19 11:50:37 +02:00
parent a7668b2a88
commit 26fafd5a2f
2 changed files with 54 additions and 28 deletions
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cpukit/score/include/rtems/score/smplockstats.h
+41
View File
@@ -171,6 +171,47 @@ void _SMP_lock_Stats_destroy( SMP_lock_Stats *stats );
void _SMP_lock_Stats_register( SMP_lock_Stats *stats );
typedef struct {
CPU_Counter_ticks first;
} SMP_lock_Stats_acquire_context;
static inline void _SMP_lock_Stats_acquire_begin(
SMP_lock_Stats_acquire_context *acquire_context
)
{
acquire_context->first = _CPU_Counter_read();
}
static inline void _SMP_lock_Stats_acquire_end(
const SMP_lock_Stats_acquire_context *acquire_context,
SMP_lock_Stats *stats,
SMP_lock_Stats_context *stats_context,
unsigned int queue_length
)
{
CPU_Counter_ticks second;
CPU_Counter_ticks delta;
second = _CPU_Counter_read();
stats_context->acquire_instant = second;
delta = _CPU_Counter_difference( second, acquire_context->first );
++stats->usage_count;
stats->total_acquire_time += delta;
if ( stats->max_acquire_time < delta ) {
stats->max_acquire_time = delta;
}
if ( queue_length >= SMP_LOCK_STATS_CONTENTION_COUNTS ) {
queue_length = SMP_LOCK_STATS_CONTENTION_COUNTS - 1;
}
++stats->contention_counts[ queue_length ];
stats_context->stats = stats;
}
/**
* @brief Updates an SMP lock statistics block during a lock release.
*
cpukit/score/include/rtems/score/smplockticket.h
+13 -28
View File
@@ -82,21 +82,18 @@ static inline void _SMP_ticket_lock_Do_acquire(
SMP_ticket_lock_Control *lock
#if defined(RTEMS_PROFILING)
,
SMP_lock_Stats *stats,
SMP_lock_Stats_context *stats_context
SMP_lock_Stats *stats,
SMP_lock_Stats_context *stats_context
#endif
)
{
unsigned int my_ticket;
unsigned int now_serving;
unsigned int my_ticket;
unsigned int now_serving;
#if defined(RTEMS_PROFILING)
CPU_Counter_ticks first;
CPU_Counter_ticks second;
CPU_Counter_ticks delta;
unsigned int initial_queue_length;
unsigned int initial_queue_length;
SMP_lock_Stats_acquire_context acquire_context;
first = _CPU_Counter_read();
_SMP_lock_Stats_acquire_begin( &acquire_context );
#endif
my_ticket =
@@ -118,24 +115,12 @@ static inline void _SMP_ticket_lock_Do_acquire(
#if defined(RTEMS_PROFILING)
}
second = _CPU_Counter_read();
stats_context->acquire_instant = second;
delta = _CPU_Counter_difference( second, first );
++stats->usage_count;
stats->total_acquire_time += delta;
if ( stats->max_acquire_time < delta ) {
stats->max_acquire_time = delta;
}
if ( initial_queue_length >= SMP_LOCK_STATS_CONTENTION_COUNTS ) {
initial_queue_length = SMP_LOCK_STATS_CONTENTION_COUNTS - 1;
}
++stats->contention_counts[initial_queue_length];
stats_context->stats = stats;
_SMP_lock_Stats_acquire_end(
&acquire_context,
stats,
stats_context,
initial_queue_length
);
#endif
}