/*
* Return unused memory to the system if possible.
*/
static void trimHeaps()
{
HS_BOILERPLATE();
HeapSource *hs = gHs;
size_t heapBytes = 0;
for (size_t i = 0; i < hs->numHeaps; i++) {
Heap *heap = &hs->heaps[i];
/* Return the wilderness chunk to the system.
*/
mspace_trim(heap->msp, 0);
/* Return any whole free pages to the system.
*/
mspace_walk_free_pages(heap->msp, releasePagesInRange, &heapBytes);
}
/* Same for the native heap.
*/
dlmalloc_trim(0);
size_t nativeBytes = 0;
dlmalloc_walk_free_pages(releasePagesInRange, &nativeBytes);
LOGD_HEAP("madvised %zd (GC) + %zd (native) = %zd total bytes",
heapBytes, nativeBytes, heapBytes + nativeBytes);
}
int
public_mTRIm(size_t s)
{
int result;
(void)mutex_lock(&main_arena.mutex);
result = mspace_trim(arena_to_mspace(&main_arena), s);
(void)mutex_unlock(&main_arena.mutex);
return result;
}
bool MemoryHeap::trim(size_t pad)
{
size_t released = release_unused_segments((mstate)mMspace);
int trimmed = mspace_trim(mMspace, pad);
return released > 0 || trimmed > 0;
}
mm_shared_space_trim(struct mm_shared_space *space)
{
mm_common_lock(&space->lock);
mspace_trim(space->space.opaque, 64 * MM_PAGE_SIZE);
mm_common_unlock(&space->lock);
}
mm_private_space_trim(struct mm_private_space *space)
{
mspace_trim(space->space.opaque, 16 * MM_PAGE_SIZE);
}
