void swap_remove (uint32_t swap_index)
{
ASSERT (swap_index < total_swap_size);
lock_acquire (&swap_lock);
ASSERT (bitmap_test (swap_bitmap, swap_index));
bitmap_reset (swap_bitmap, swap_index);
lock_release (&swap_lock);
}
size_t block_store_release(block_store_t *const bs, const size_t block_id) {
if (bs && bs->fbm && BLOCKID_VALID(block_id)) {
// we could clear the dirty bit, since the info is no longer in use but...
// We'll keep it. Could be useful. Doesn't really hurt anything.
// Keeps it more true to a standard block device.
// You could also use this function to format the specified block for security reasons
bitmap_reset(bs->fbm, block_id);
block_store_errno = BS_OK;
return block_id;
}
block_store_errno = BS_PARAM;
return 0;
}
void wavefront_bitmap_initialize( struct bitmap *b )
{
int i, j;
bitmap_reset(b,WAVEFRONT_TASK_STATE_NOTREADY);
for(i=0;i<=xsize;i++) {
bitmap_set(b,i,0,WAVEFRONT_TASK_STATE_COMPLETE);
}
for(j=0;j<=ysize;j++) {
bitmap_set(b,0,j,WAVEFRONT_TASK_STATE_COMPLETE);
}
}
void swap_read (void *dest, uint32_t swap_index)
{
uint32_t i;
ASSERT (swap_index < total_swap_size);
lock_acquire (&swap_lock);
ASSERT (bitmap_test (swap_bitmap, swap_index));
bitmap_reset (swap_bitmap, swap_index);
for (i = 0u; i < blocks_per_page; i++)
{
block_read (swap_block, swap_index * blocks_per_page + i,
(char *)dest + i * BLOCK_SECTOR_SIZE);
}
lock_release (&swap_lock);
}
void wavefront_task_initialize( struct bitmap *b, struct list * list )
{
int i, j;
bitmap_reset(b,WAVEFRONT_TASK_STATE_NOTREADY);
for(i=0;i<=xsize;i++) {
bitmap_set(b,i,0,WAVEFRONT_TASK_STATE_COMPLETE);
}
for(j=0;j<=ysize;j++) {
bitmap_set(b,0,j,WAVEFRONT_TASK_STATE_COMPLETE);
}
list_push_head(list,wavefront_task_create(xstart,ystart,block_size,block_size));
}
void load_swapped_page_into_frame(struct page_info* p, void* frame) {
lock_acquire(&swap_lock);
int index = p->swap_info.swap_index;
bitmap_reset(swapmap, index);
// Read the 4KB page from disk to the passed-in frame
// We're going to need to read out eight sectors, one at a time
block_sector_t sector_index = index * SECTORS_PER_PAGE;
int i;
for (i = 0; i < SECTORS_PER_PAGE; i++) {
block_sector_t source_sector = sector_index + i;
void* target_buf = (uint8_t *)frame + (i * BLOCK_SECTOR_SIZE);
block_read(swap_block, source_sector, target_buf);
}
lock_release(&swap_lock);
}
void delete_swapped_page(struct page_info* p) {
lock_acquire(&swap_lock);
int index = p->swap_info.swap_index;
bitmap_reset(swapmap, index);
lock_release(&swap_lock);
}
void tm_thread_release_stacks(struct thread *thr)
{
mutex_acquire(&thr->process->stacks_lock);
bitmap_reset(thr->process->stack_bitmap, thr->stack_num);
mutex_release(&thr->process->stacks_lock);
}
void bitmap_writer_build(struct packing_data *to_pack)
{
static const double REUSE_BITMAP_THRESHOLD = 0.2;
int i, reuse_after, need_reset;
struct bitmap *base = bitmap_new();
struct rev_info revs;
writer.bitmaps = kh_init_sha1();
writer.to_pack = to_pack;
if (writer.show_progress)
writer.progress = start_progress("Building bitmaps", writer.selected_nr);
init_revisions(&revs, NULL);
revs.tag_objects = 1;
revs.tree_objects = 1;
revs.blob_objects = 1;
revs.no_walk = 0;
revs.include_check = should_include;
reset_revision_walk();
reuse_after = writer.selected_nr * REUSE_BITMAP_THRESHOLD;
need_reset = 0;
for (i = writer.selected_nr - 1; i >= 0; --i) {
struct bitmapped_commit *stored;
struct object *object;
khiter_t hash_pos;
int hash_ret;
stored = &writer.selected[i];
object = (struct object *)stored->commit;
if (stored->bitmap == NULL) {
if (i < writer.selected_nr - 1 &&
(need_reset ||
!in_merge_bases(writer.selected[i + 1].commit,
stored->commit))) {
bitmap_reset(base);
reset_all_seen();
}
add_pending_object(&revs, object, "");
revs.include_check_data = base;
if (prepare_revision_walk(&revs))
die("revision walk setup failed");
traverse_commit_list(&revs, show_commit, show_object, base);
revs.pending.nr = 0;
revs.pending.alloc = 0;
revs.pending.objects = NULL;
stored->bitmap = bitmap_to_ewah(base);
need_reset = 0;
} else
need_reset = 1;
if (i >= reuse_after)
stored->flags |= BITMAP_FLAG_REUSE;
hash_pos = kh_put_sha1(writer.bitmaps, object->sha1, &hash_ret);
if (hash_ret == 0)
die("Duplicate entry when writing index: %s",
sha1_to_hex(object->sha1));
kh_value(writer.bitmaps, hash_pos) = stored;
display_progress(writer.progress, writer.selected_nr - i);
}
bitmap_free(base);
stop_progress(&writer.progress);
compute_xor_offsets();
}
static void
free_swap_slot (size_t swap_sector_idx) {
lock_acquire (&swap_lock);
bitmap_reset (used_map, swap_sector_idx / SECTORS_PER_SWAP);
lock_release (&swap_lock);
}