forked from Imagelibrary/rtems
d37adfe5dd
The CPU time used of a thread was previously maintained per-processor mostly during _Thread_Dispatch(). However, on SMP configurations the actual processor of a thread is difficult to figure out since thread dispatching is a highly asynchronous process (e.g. via inter-processor interrupts). Only the intended processor of a thread is known to the scheduler easily. Do the CPU usage accounting during thread heir updates in the context of the scheduler operations. Provide the function _Thread_Get_CPU_time_used() to get the CPU usage of a thread using proper locks to get a consistent value. Close #2627.
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/**
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* @file
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*
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* @brief CPU Usage Reset
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* @ingroup libmisc_cpuuse CPU Usage
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*/
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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.org/license/LICENSE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/cpuuse.h>
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#include <rtems/score/percpu.h>
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#include <rtems/score/todimpl.h>
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#include <rtems/score/schedulerimpl.h>
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#include <rtems/score/watchdogimpl.h>
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static void CPU_usage_Per_thread_handler(
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Thread_Control *the_thread
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)
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{
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ISR_lock_Context lock_context;
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_Scheduler_Acquire( the_thread, &lock_context );
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_Timestamp_Set_to_zero( &the_thread->cpu_time_used );
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_Scheduler_Release( the_thread, &lock_context );
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}
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/*
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* rtems_cpu_usage_reset
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*/
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void rtems_cpu_usage_reset( void )
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{
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uint32_t cpu_count;
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uint32_t cpu_index;
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_TOD_Get_uptime( &CPU_usage_Uptime_at_last_reset );
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cpu_count = rtems_get_processor_count();
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for ( cpu_index = 0 ; cpu_index < cpu_count ; ++cpu_index ) {
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Per_CPU_Control *cpu = _Per_CPU_Get_by_index( cpu_index );
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cpu->cpu_usage_timestamp = CPU_usage_Uptime_at_last_reset;
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}
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rtems_iterate_over_all_threads(CPU_usage_Per_thread_handler);
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}
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