/**
* workingset_eviction - note the eviction of a page from memory
* @mapping: address space the page was backing
* @page: the page being evicted
*
* Returns a shadow entry to be stored in @mapping->page_tree in place
* of the evicted @page so that a later refault can be detected.
*/
void *workingset_eviction(struct address_space *mapping, struct page *page)
{
struct zone *zone = page_zone(page);
unsigned long eviction;
eviction = atomic_long_inc_return(&zone->inactive_age);
return pack_shadow(eviction, zone);
}
inline void doBarrier(size_t tid) {
assert(tid<maxNThreads);
const int whichBar = (barArray[tid] ^= true); // computes % 2
long c = atomic_long_inc_return(&B[whichBar]);
if ((size_t)c == _barrier) {
atomic_long_set(&B[whichBar], 0);
return;
}
// spin-wait
while(c) {
c= atomic_long_read(&B[whichBar]);
PAUSE(); // TODO: define a spin policy !
}
}
static int nfs_set_page_writeback(struct page *page)
{
int ret = test_set_page_writeback(page);
if (!ret) {
struct inode *inode = page->mapping->host;
struct nfs_server *nfss = NFS_SERVER(inode);
if (atomic_long_inc_return(&nfss->writeback) >
NFS_CONGESTION_ON_THRESH) {
set_bdi_congested(&nfss->backing_dev_info,
BLK_RW_ASYNC);
}
}
return ret;
}
void unix_inflight(struct file *fp)
{
struct sock *s = unix_get_socket(fp);
if (s) {
struct unix_sock *u = unix_sk(s);
spin_lock(&unix_gc_lock);
if (atomic_long_inc_return(&u->inflight) == 1) {
BUG_ON(!list_empty(&u->link));
list_add_tail(&u->link, &gc_inflight_list);
} else {
BUG_ON(list_empty(&u->link));
}
unix_tot_inflight++;
spin_unlock(&unix_gc_lock);
}
}
/*
* For use from filesystems to quickly init and register a bdi associated
* with dirty writeback
*/
int bdi_setup_and_register(struct backing_dev_info *bdi, char *name)
{
int err;
bdi->name = name;
bdi->capabilities = 0;
err = bdi_init(bdi);
if (err)
return err;
err = bdi_register(bdi, NULL, "%.28s-%ld", name,
atomic_long_inc_return(&bdi_seq));
if (err) {
bdi_destroy(bdi);
return err;
}
return 0;
}
value_type operator++() // prefix
{ return atomic_long_inc_return(&_rep); }
