dmmlib/dmm_adaptor.c

#include "dmm_adaptor.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;
    }
}