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/*
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* CPU Usage Reporter
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*
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* COPYRIGHT (c) 1989-2009
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#include "lfr_cpu_usage_report.h"
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unsigned char lfr_rtems_cpu_usage_report( void )
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{
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uint32_t api_index;
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Thread_Control *the_thread;
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Objects_Information *information;
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uint32_t ival, fval;
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#ifndef __RTEMS_USE_TICKS_FOR_STATISTICS__
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Timestamp_Control uptime;
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Timestamp_Control total;
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Timestamp_Control ran;
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#else
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uint32_t total_units = 0;
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#endif
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unsigned char cpu_load;
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cpu_load = 0;
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/*
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* When not using nanosecond CPU usage resolution, we have to count
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* the number of "ticks" we gave credit for to give the user a rough
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* guideline as to what each number means proportionally.
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*/
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#ifndef __RTEMS_USE_TICKS_FOR_STATISTICS__
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_TOD_Get_uptime( &uptime );
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_Timestamp_Subtract( &CPU_usage_Uptime_at_last_reset, &uptime, &total );
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#else
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for ( api_index = 1 ; api_index <= OBJECTS_APIS_LAST ; api_index++ ) {
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if ( !_Objects_Information_table[ api_index ] ) { }
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else
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{
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information = _Objects_Information_table[ api_index ][ 1 ];
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if ( information != NULL )
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{
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for ( i=1 ; i <= information->maximum ; i++ ) {
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the_thread = (Thread_Control *)information->local_table[ i ];
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if ( the_thread != NULL )
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total_units += the_thread->cpu_time_used;
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}
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}
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}
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}
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#endif
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for ( api_index = 1 ; api_index <= OBJECTS_APIS_LAST ; api_index++ )
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{
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if ( !_Objects_Information_table[ api_index ] ) { }
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else
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{
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information = _Objects_Information_table[ api_index ][ 1 ];
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if ( information != NULL )
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{
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the_thread = (Thread_Control *)information->local_table[ 1 ];
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if ( the_thread == NULL ) { }
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else
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{
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#ifndef __RTEMS_USE_TICKS_FOR_STATISTICS__
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/*
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* If this is the currently executing thread, account for time
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* since the last context switch.
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*/
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ran = the_thread->cpu_time_used;
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if ( _Thread_Executing->Object.id == the_thread->Object.id )
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{
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Timestamp_Control used;
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_Timestamp_Subtract(
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&_Thread_Time_of_last_context_switch, &uptime, &used
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);
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_Timestamp_Add_to( &ran, &used );
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}
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_Timestamp_Divide( &ran, &total, &ival, &fval );
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#else
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if (total_units != 0)
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{
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uint64_t ival_64;
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ival_64 = the_thread->cpu_time_used;
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ival_64 *= 100000;
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ival = ival_64 / total_units;
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}
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else
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{
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ival = 0;
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}
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fval = ival % 1000;
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ival /= 1000;
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#endif
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}
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}
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}
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}
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cpu_load = (unsigned char) (100 - ival);
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return cpu_load;
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}
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