dmmlib/dmm_adaptor.c

#include "dmm_adaptor.h"
#include "heap.h"

void state_refresh(heap_t *heap) {
	float fragmentation;
	knob_state_t state;

	fragmentation = (float) heap->dmm_stats.mem_allocated / 
		(float)	heap->dmm_stats.mem_requested - 1.0;

	// TODO Constant for the threshold, contraints for the memory threshold
	if(fragmentation <= 0.05) {
		state = 0;
		set_fragmentation_params(heap, state);
	}
}

void set_fragmentation_params(heap_t *heap, knob_state_t state) {
	switch(state) {
		default :
			heap->dmm_knobs.max_coalesce_size = -1;
			heap->dmm_knobs.min_split_size = 0;
			heap->dmm_knobs.empty_threshold = 1.5;
			break;
		case 1 :
			heap->dmm_knobs.max_coalesce_size = 20;
			heap->dmm_knobs.min_split_size = 400;
			heap->dmm_knobs.empty_threshold = 1200;
			break;
		case 2 :
			heap->dmm_knobs.max_coalesce_size = 40;
			heap->dmm_knobs.min_split_size = 800;
			heap->dmm_knobs.empty_threshold = 1000;
			break;
		case 3 :
			heap->dmm_knobs.max_coalesce_size = 60;
			heap->dmm_knobs.min_split_size = 1200;
			heap->dmm_knobs.empty_threshold = 800;
			break;
		case 4 :
			heap->dmm_knobs.max_coalesce_size = 80;
			heap->dmm_knobs.min_split_size = 1600;
			heap->dmm_knobs.empty_threshold = 600;
			break;
		case 5 :
			heap->dmm_knobs.max_coalesce_size = 100;
			heap->dmm_knobs.min_split_size = 2000;
			heap->dmm_knobs.empty_threshold = 300;
			break;
	}
}