struct page* alloc_split(struct page *split, int n, struct page *next)
{
/* Assumes freepages_lock held */
#ifndef NMEMDEBUG
/* These pages had better be free */
pageid i, pnb = PAGENB(split);
pageid mnb = MAPNB(split);
assert(split->pagecount >= n);
for (i = pnb; i < pnb + split->pagecount; i++)
assert(page_region(mnb, i) == FREEPAGE);
#endif /* ifndef NMEMDEBUG */
if (split->pagecount > n) {
/* Keep first part of block */
split->pagecount -= n;
/* Return latter part of block */
split =
(struct page*)( (char*)split +
(split->pagecount << RPAGELOG) );
/* Update the by address list */
}
split->next = next;
split->pagecount = n;
split->free = 0;
/*split->list_id = Hash(pthread_self())%MAXLISTS;*/
split->list_id = list_id % MAXLISTS;
return split;
}
void free_pages(region r, struct page *p)
/* Assumes freepages_lock held */
{
#ifndef NMEMDEBUG
pageid i, pnb = PAGENB(p);
for (i = pnb; i < pnb + p->pagecount; i++)
{
assert(page_region(i) == r);
set_page_region(i, FREEPAGE);
}
#endif
coalesce(p);
}
struct page *alloc_split(struct page *split, int n, struct page *next)
/* Assumes freepages_lock held */
{
// fprintf(stderr, "## alloc_split: split=%p, n=%d, next=%p, split->pagecount=%d\n", split, n, next, split->pagecount);
#ifndef NMEMDEBUG
/* These pages had better be free */
pageid i, pnb = PAGENB(split);
assert(n > 0);
assert(split->pagecount >= n);
for (i = pnb; i < pnb + split->pagecount; i++)
assert(page_region(i) == FREEPAGE);
#endif
if (split->pagecount > n)
{
struct page *splitoff;
/* Keep first part of block */
split->pagecount -= n;
assert(split->pagecount > 0);
/* Return latter part of block */
splitoff = split;
split = (struct page *)((char *)split + (split->pagecount << RPAGELOG));
VALGRIND_MAKE_WRITABLE(split, sizeof(struct page));
memset(split, 0, sizeof(struct page));
/* Update the by-address list */
insertbefore_address(split, splitoff->next_address);
}
else
{
/* remove split from list */
unlink_page(&unused_pages, split);
}
split->next = next;
split->pagecount = n;
assert(split->pagecount > 0);
split->free = 0;
return split;
}
void free_pages(region_t r, struct page *p)
/* Assumes freepages_lock held */
{
#ifndef NMEMDEBUG
pageid i;
pageid pnb = PAGENB(p);
pageid mnb = MAPNB(p);
for (i = pnb; i < pnb + p->pagecount; i++) {
assert(page_region(mnb, i) == r);
set_page_region(mnb, i, FREEPAGE);
}
#endif /* ifndef NMEMDEBUG */
list_id = get_next_random_list(MAXLISTS);
while (try_lock(&single_pages[list_id % MAXLISTS].lock) == 1)
list_id = get_next_random_list(MAXLISTS);
p->next = single_pages[list_id].pages;
single_pages[list_id].pages = p;
single_pages[list_id].page_count += p->pagecount;
release_spinlock(&single_pages[list_id].lock);
/*acquire_spinlock2( &single_pages[p->list_id].lock );*/
/*p->next = single_pages[p->list_id].pages;*/
/*single_pages[p->list_id].pages = p;*/
/*single_pages[p->list_id].page_count += p->pagecount;*/
/*release_spinlock( &single_pages[p->list_id].lock );*/
/*p->next = single_pages[pt%MAXLISTS].pages;*/
/*single_pages[pt%MAXLISTS].pages = p;*/
/*single_pages[pt%MAXLISTS].page_count++;*/
/*for( i = 0; i < p->pagecount; i++){*/
/*add_single_pages(p,Hash(pt)%MAXLISTS);*/
/*p=p->next;*/
/*}*/
}
