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authorJens Axboe <axboe@kernel.dk>2019-11-14 08:00:41 -0700
committerJens Axboe <axboe@kernel.dk>2019-11-14 08:02:19 -0700
commit021d1cdda3875bf35edac9133335f622d7910abc (patch)
tree8a7ab3f099ca21df6e5e73a001cfb6328dbf636b
parenta320e9fa1e2680116d165b9369dfa41d7cc1e1d1 (diff)
io-wq: remove now redundant struct io_wq_nulls_list
Since we don't iterate these lists anymore after commit: e61df66c69b1 ("io-wq: ensure free/busy list browsing see all items") we don't need to retain the nulls value we use for them. That means it's pretty pointless to wrap the hlist_nulls_head in a structure, so get rid of it. Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--fs/io-wq.c29
1 files changed, 10 insertions, 19 deletions
diff --git a/fs/io-wq.c b/fs/io-wq.c
index fcb6c74209da..9174007ce107 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -59,11 +59,6 @@ struct io_worker {
struct files_struct *restore_files;
};
-struct io_wq_nulls_list {
- struct hlist_nulls_head head;
- unsigned long nulls;
-};
-
#if BITS_PER_LONG == 64
#define IO_WQ_HASH_ORDER 6
#else
@@ -95,8 +90,8 @@ struct io_wqe {
int node;
struct io_wqe_acct acct[2];
- struct io_wq_nulls_list free_list;
- struct io_wq_nulls_list busy_list;
+ struct hlist_nulls_head free_list;
+ struct hlist_nulls_head busy_list;
struct list_head all_list;
struct io_wq *wq;
@@ -249,7 +244,7 @@ static bool io_wqe_activate_free_worker(struct io_wqe *wqe)
struct hlist_nulls_node *n;
struct io_worker *worker;
- n = rcu_dereference(hlist_nulls_first_rcu(&wqe->free_list.head));
+ n = rcu_dereference(hlist_nulls_first_rcu(&wqe->free_list));
if (is_a_nulls(n))
return false;
@@ -325,8 +320,7 @@ static void __io_worker_busy(struct io_wqe *wqe, struct io_worker *worker,
if (worker->flags & IO_WORKER_F_FREE) {
worker->flags &= ~IO_WORKER_F_FREE;
hlist_nulls_del_init_rcu(&worker->nulls_node);
- hlist_nulls_add_head_rcu(&worker->nulls_node,
- &wqe->busy_list.head);
+ hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->busy_list);
}
/*
@@ -365,8 +359,7 @@ static bool __io_worker_idle(struct io_wqe *wqe, struct io_worker *worker)
if (!(worker->flags & IO_WORKER_F_FREE)) {
worker->flags |= IO_WORKER_F_FREE;
hlist_nulls_del_init_rcu(&worker->nulls_node);
- hlist_nulls_add_head_rcu(&worker->nulls_node,
- &wqe->free_list.head);
+ hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list);
}
return __io_worker_unuse(wqe, worker);
@@ -592,7 +585,7 @@ static void create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index)
}
spin_lock_irq(&wqe->lock);
- hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list.head);
+ hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list);
list_add_tail_rcu(&worker->all_list, &wqe->all_list);
worker->flags |= IO_WORKER_F_FREE;
if (index == IO_WQ_ACCT_BOUND)
@@ -617,7 +610,7 @@ static inline bool io_wqe_need_worker(struct io_wqe *wqe, int index)
if (index == IO_WQ_ACCT_BOUND && !acct->nr_workers)
return true;
/* if we have available workers or no work, no need */
- if (!hlist_nulls_empty(&wqe->free_list.head) || !io_wqe_run_queue(wqe))
+ if (!hlist_nulls_empty(&wqe->free_list) || !io_wqe_run_queue(wqe))
return false;
return acct->nr_workers < acct->max_workers;
}
@@ -665,7 +658,7 @@ static bool io_wq_can_queue(struct io_wqe *wqe, struct io_wqe_acct *acct,
return true;
rcu_read_lock();
- free_worker = !hlist_nulls_empty(&wqe->free_list.head);
+ free_worker = !hlist_nulls_empty(&wqe->free_list);
rcu_read_unlock();
if (free_worker)
return true;
@@ -1009,10 +1002,8 @@ struct io_wq *io_wq_create(unsigned bounded, struct mm_struct *mm,
wqe->wq = wq;
spin_lock_init(&wqe->lock);
INIT_LIST_HEAD(&wqe->work_list);
- INIT_HLIST_NULLS_HEAD(&wqe->free_list.head, 0);
- wqe->free_list.nulls = 0;
- INIT_HLIST_NULLS_HEAD(&wqe->busy_list.head, 1);
- wqe->busy_list.nulls = 1;
+ INIT_HLIST_NULLS_HEAD(&wqe->free_list, 0);
+ INIT_HLIST_NULLS_HEAD(&wqe->busy_list, 1);
INIT_LIST_HEAD(&wqe->all_list);
i++;