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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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#include "fsw_params.h"
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extern rtems_id Task_id[];
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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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uint32_t information_index;
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Thread_Control *the_thread;
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Objects_Information *information;
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uint32_t ival;
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uint32_t 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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Timestamp_Control abs_total;
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Timestamp_Control abs_ran;
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static Timestamp_Control last_total={0,0};
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static Timestamp_Control last_ran={0,0};
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#else
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#error "Can't compute CPU usage using ticks on LFR"
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#endif
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unsigned char cpu_load;
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ival = 0;
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cpu_load = 0;
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_TOD_Get_uptime( &uptime );
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_Timestamp_Subtract( &CPU_usage_Uptime_at_last_reset, &uptime, &abs_total );
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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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for(information_index=1;information_index<=information->maximum;information_index++)
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{
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the_thread = (Thread_Control *)information->local_table[ information_index ];
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if ( the_thread == NULL) { }
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else if(the_thread->Object.id == Task_id[TASKID_SCRB]) // Only measure scrubbing task load, CPU load is 100%-Scrubbing
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{
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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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abs_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( &abs_ran, &used );
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}
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/*
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* Only consider the time since last call
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*/
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_Timespec_Subtract(&last_ran, &abs_ran, &ran);
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_Timespec_Subtract(&last_total, &abs_total, &total);
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last_ran = abs_ran;
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last_total = abs_total;
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_Timestamp_Divide( &ran, &total, &ival, &fval);
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cpu_load = (unsigned char)(CONST_100 - ival);
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}
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}
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}
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}
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}
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return cpu_load;
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}
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