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btrfs: simplify WQ_HIGHPRI handling in struct btrfs_workqueue

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Just let the one caller that wants optional WQ_HIGHPRI handling allocate
a separate btrfs_workqueue for that.  This allows to rename struct
__btrfs_workqueue to btrfs_workqueue, remove a pointer indirection and
separate allocation for all btrfs_workqueue users and generally simplify
the code.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Christoph Hellwig 2022-04-18 06:43:09 +02:00 committed by David Sterba
parent a7b8e39c92
commit a31b4a4368
6 changed files with 48 additions and 130 deletions
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124
fs/btrfs/async-thread.c
View File

@ -15,13 +15,12 @@
enum {
WORK_DONE_BIT,
WORK_ORDER_DONE_BIT,
WORK_HIGH_PRIO_BIT,
};
#define NO_THRESHOLD (-1)
#define DFT_THRESHOLD (32)
struct __btrfs_workqueue {
struct btrfs_workqueue {
struct workqueue_struct *normal_wq;
/* File system this workqueue services */
@ -48,12 +47,7 @@ struct __btrfs_workqueue {
spinlock_t thres_lock;
};
struct btrfs_workqueue {
struct __btrfs_workqueue *normal;
struct __btrfs_workqueue *high;
};
struct btrfs_fs_info * __pure btrfs_workqueue_owner(const struct __btrfs_workqueue *wq)
struct btrfs_fs_info * __pure btrfs_workqueue_owner(const struct btrfs_workqueue *wq)
{
return wq->fs_info;
}
@ -66,22 +60,22 @@ struct btrfs_fs_info * __pure btrfs_work_owner(const struct btrfs_work *work)
bool btrfs_workqueue_normal_congested(const struct btrfs_workqueue *wq)
{
/*
* We could compare wq->normal->pending with num_online_cpus()
* We could compare wq->pending with num_online_cpus()
* to support "thresh == NO_THRESHOLD" case, but it requires
* moving up atomic_inc/dec in thresh_queue/exec_hook. Let's
* postpone it until someone needs the support of that case.
*/
if (wq->normal->thresh == NO_THRESHOLD)
if (wq->thresh == NO_THRESHOLD)
return false;
return atomic_read(&wq->normal->pending) > wq->normal->thresh * 2;
return atomic_read(&wq->pending) > wq->thresh * 2;
}
static struct __btrfs_workqueue *
__btrfs_alloc_workqueue(struct btrfs_fs_info *fs_info, const char *name,
unsigned int flags, int limit_active, int thresh)
struct btrfs_workqueue *btrfs_alloc_workqueue(struct btrfs_fs_info *fs_info,
const char *name, unsigned int flags,
int limit_active, int thresh)
{
struct __btrfs_workqueue *ret = kzalloc(sizeof(*ret), GFP_KERNEL);
struct btrfs_workqueue *ret = kzalloc(sizeof(*ret), GFP_KERNEL);
if (!ret)
return NULL;
@ -105,12 +99,8 @@ __btrfs_alloc_workqueue(struct btrfs_fs_info *fs_info, const char *name,
ret->thresh = thresh;
}
if (flags & WQ_HIGHPRI)
ret->normal_wq = alloc_workqueue("btrfs-%s-high", flags,
ret->current_active, name);
else
ret->normal_wq = alloc_workqueue("btrfs-%s", flags,
ret->current_active, name);
ret->normal_wq = alloc_workqueue("btrfs-%s", flags, ret->current_active,
name);
if (!ret->normal_wq) {
kfree(ret);
return NULL;
@ -119,41 +109,7 @@ __btrfs_alloc_workqueue(struct btrfs_fs_info *fs_info, const char *name,
INIT_LIST_HEAD(&ret->ordered_list);
spin_lock_init(&ret->list_lock);
spin_lock_init(&ret->thres_lock);
trace_btrfs_workqueue_alloc(ret, name, flags & WQ_HIGHPRI);
return ret;
}
static inline void
__btrfs_destroy_workqueue(struct __btrfs_workqueue *wq);
struct btrfs_workqueue *btrfs_alloc_workqueue(struct btrfs_fs_info *fs_info,
const char *name,
unsigned int flags,
int limit_active,
int thresh)
{
struct btrfs_workqueue *ret = kzalloc(sizeof(*ret), GFP_KERNEL);
if (!ret)
return NULL;
ret->normal = __btrfs_alloc_workqueue(fs_info, name,
flags & ~WQ_HIGHPRI,
limit_active, thresh);
if (!ret->normal) {
kfree(ret);
return NULL;
}
if (flags & WQ_HIGHPRI) {
ret->high = __btrfs_alloc_workqueue(fs_info, name, flags,
limit_active, thresh);
if (!ret->high) {
__btrfs_destroy_workqueue(ret->normal);
kfree(ret);
return NULL;
}
}
trace_btrfs_workqueue_alloc(ret, name);
return ret;
}
@ -162,7 +118,7 @@ struct btrfs_workqueue *btrfs_alloc_workqueue(struct btrfs_fs_info *fs_info,
* This hook WILL be called in IRQ handler context,
* so workqueue_set_max_active MUST NOT be called in this hook
*/
static inline void thresh_queue_hook(struct __btrfs_workqueue *wq)
static inline void thresh_queue_hook(struct btrfs_workqueue *wq)
{
if (wq->thresh == NO_THRESHOLD)
return;
@ -174,7 +130,7 @@ static inline void thresh_queue_hook(struct __btrfs_workqueue *wq)
* This hook is called in kthread content.
* So workqueue_set_max_active is called here.
*/
static inline void thresh_exec_hook(struct __btrfs_workqueue *wq)
static inline void thresh_exec_hook(struct btrfs_workqueue *wq)
{
int new_current_active;
long pending;
@ -217,7 +173,7 @@ out:
}
}
static void run_ordered_work(struct __btrfs_workqueue *wq,
static void run_ordered_work(struct btrfs_workqueue *wq,
struct btrfs_work *self)
{
struct list_head *list = &wq->ordered_list;
@ -305,7 +261,7 @@ static void btrfs_work_helper(struct work_struct *normal_work)
{
struct btrfs_work *work = container_of(normal_work, struct btrfs_work,
normal_work);
struct __btrfs_workqueue *wq;
struct btrfs_workqueue *wq = work->wq;
int need_order = 0;
/*
@ -318,7 +274,6 @@ static void btrfs_work_helper(struct work_struct *normal_work)
*/
if (work->ordered_func)
need_order = 1;
wq = work->wq;
trace_btrfs_work_sched(work);
thresh_exec_hook(wq);
@ -350,8 +305,7 @@ void btrfs_init_work(struct btrfs_work *work, btrfs_func_t func,
work->flags = 0;
}
static inline void __btrfs_queue_work(struct __btrfs_workqueue *wq,
struct btrfs_work *work)
void btrfs_queue_work(struct btrfs_workqueue *wq, struct btrfs_work *work)
{
unsigned long flags;
@ -366,54 +320,22 @@ static inline void __btrfs_queue_work(struct __btrfs_workqueue *wq,
queue_work(wq->normal_wq, &work->normal_work);
}
void btrfs_queue_work(struct btrfs_workqueue *wq,
struct btrfs_work *work)
{
struct __btrfs_workqueue *dest_wq;
if (test_bit(WORK_HIGH_PRIO_BIT, &work->flags) && wq->high)
dest_wq = wq->high;
else
dest_wq = wq->normal;
__btrfs_queue_work(dest_wq, work);
}
static inline void
__btrfs_destroy_workqueue(struct __btrfs_workqueue *wq)
void btrfs_destroy_workqueue(struct btrfs_workqueue *wq)
{
if (!wq)
return;
destroy_workqueue(wq->normal_wq);
trace_btrfs_workqueue_destroy(wq);
kfree(wq);
}
void btrfs_destroy_workqueue(struct btrfs_workqueue *wq)
{
if (!wq)
return;
if (wq->high)
__btrfs_destroy_workqueue(wq->high);
__btrfs_destroy_workqueue(wq->normal);
kfree(wq);
}
void btrfs_workqueue_set_max(struct btrfs_workqueue *wq, int limit_active)
{
if (!wq)
return;
wq->normal->limit_active = limit_active;
if (wq->high)
wq->high->limit_active = limit_active;
}
void btrfs_set_work_high_priority(struct btrfs_work *work)
{
set_bit(WORK_HIGH_PRIO_BIT, &work->flags);
if (wq)
wq->limit_active = limit_active;
}
void btrfs_flush_workqueue(struct btrfs_workqueue *wq)
{
if (wq->high)
flush_workqueue(wq->high->normal_wq);
flush_workqueue(wq->normal->normal_wq);
flush_workqueue(wq->normal_wq);
}

7
fs/btrfs/async-thread.h
View File

@ -11,8 +11,6 @@
struct btrfs_fs_info;
struct btrfs_workqueue;
/* Internal use only */
struct __btrfs_workqueue;
struct btrfs_work;
typedef void (*btrfs_func_t)(struct btrfs_work *arg);
typedef void (*btrfs_work_func_t)(struct work_struct *arg);
@ -25,7 +23,7 @@ struct btrfs_work {
/* Don't touch things below */
struct work_struct normal_work;
struct list_head ordered_list;
struct __btrfs_workqueue *wq;
struct btrfs_workqueue *wq;
unsigned long flags;
};
@ -40,9 +38,8 @@ void btrfs_queue_work(struct btrfs_workqueue *wq,
struct btrfs_work *work);
void btrfs_destroy_workqueue(struct btrfs_workqueue *wq);
void btrfs_workqueue_set_max(struct btrfs_workqueue *wq, int max);
void btrfs_set_work_high_priority(struct btrfs_work *work);
struct btrfs_fs_info * __pure btrfs_work_owner(const struct btrfs_work *work);
struct btrfs_fs_info * __pure btrfs_workqueue_owner(const struct __btrfs_workqueue *wq);
struct btrfs_fs_info * __pure btrfs_workqueue_owner(const struct btrfs_workqueue *wq);
bool btrfs_workqueue_normal_congested(const struct btrfs_workqueue *wq);
void btrfs_flush_workqueue(struct btrfs_workqueue *wq);

1
fs/btrfs/ctree.h
View File

@ -847,6 +847,7 @@ struct btrfs_fs_info {
* two
*/
struct btrfs_workqueue *workers;
struct btrfs_workqueue *hipri_workers;
struct btrfs_workqueue *delalloc_workers;
struct btrfs_workqueue *flush_workers;
struct btrfs_workqueue *endio_workers;

15
fs/btrfs/disk-io.c
View File

@ -874,9 +874,9 @@ blk_status_t btrfs_wq_submit_bio(struct inode *inode, struct bio *bio,
async->status = 0;
if (op_is_sync(bio->bi_opf))
btrfs_set_work_high_priority(&async->work);
btrfs_queue_work(fs_info->workers, &async->work);
btrfs_queue_work(fs_info->hipri_workers, &async->work);
else
btrfs_queue_work(fs_info->workers, &async->work);
return 0;
}
@ -2279,6 +2279,7 @@ static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
{
btrfs_destroy_workqueue(fs_info->fixup_workers);
btrfs_destroy_workqueue(fs_info->delalloc_workers);
btrfs_destroy_workqueue(fs_info->hipri_workers);
btrfs_destroy_workqueue(fs_info->workers);
btrfs_destroy_workqueue(fs_info->endio_workers);
btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
@ -2457,7 +2458,9 @@ static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info)
unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND;
fs_info->workers =
btrfs_alloc_workqueue(fs_info, "worker",
btrfs_alloc_workqueue(fs_info, "worker", flags, max_active, 16);
fs_info->hipri_workers =
btrfs_alloc_workqueue(fs_info, "worker-high",
flags | WQ_HIGHPRI, max_active, 16);
fs_info->delalloc_workers =
@ -2505,8 +2508,8 @@ static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info)
fs_info->discard_ctl.discard_workers =
alloc_workqueue("btrfs_discard", WQ_UNBOUND | WQ_FREEZABLE, 1);
if (!(fs_info->workers && fs_info->delalloc_workers &&
fs_info->flush_workers &&
if (!(fs_info->workers && fs_info->hipri_workers &&
fs_info->delalloc_workers && fs_info->flush_workers &&
fs_info->endio_workers && fs_info->endio_meta_workers &&
fs_info->endio_meta_write_workers &&
fs_info->endio_write_workers && fs_info->endio_raid56_workers &&

1
fs/btrfs/super.c
View File

@ -1903,6 +1903,7 @@ static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
old_pool_size, new_pool_size);
btrfs_workqueue_set_max(fs_info->workers, new_pool_size);
btrfs_workqueue_set_max(fs_info->hipri_workers, new_pool_size);
btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size);
btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size);
btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size);

30
include/trace/events/btrfs.h
View File

@ -24,7 +24,7 @@ struct btrfs_free_cluster;
struct map_lookup;
struct extent_buffer;
struct btrfs_work;
struct __btrfs_workqueue;
struct btrfs_workqueue;
struct btrfs_qgroup_extent_record;
struct btrfs_qgroup;
struct extent_io_tree;
@ -1457,42 +1457,36 @@ DEFINE_EVENT(btrfs__work, btrfs_ordered_sched,
TP_ARGS(work)
);
DECLARE_EVENT_CLASS(btrfs__workqueue,
DECLARE_EVENT_CLASS(btrfs_workqueue,
TP_PROTO(const struct __btrfs_workqueue *wq,
const char *name, int high),
TP_PROTO(const struct btrfs_workqueue *wq, const char *name),
TP_ARGS(wq, name, high),
TP_ARGS(wq, name),
TP_STRUCT__entry_btrfs(
__field( const void *, wq )
__string( name, name )
__field( int , high )
),
TP_fast_assign_btrfs(btrfs_workqueue_owner(wq),
__entry->wq = wq;
__assign_str(name, name);
__entry->high = high;
),
TP_printk_btrfs("name=%s%s wq=%p", __get_str(name),
__print_flags(__entry->high, "",
{(WQ_HIGHPRI), "-high"}),
TP_printk_btrfs("name=%s wq=%p", __get_str(name),
__entry->wq)
);
DEFINE_EVENT(btrfs__workqueue, btrfs_workqueue_alloc,
DEFINE_EVENT(btrfs_workqueue, btrfs_workqueue_alloc,
TP_PROTO(const struct __btrfs_workqueue *wq,
const char *name, int high),
TP_PROTO(const struct btrfs_workqueue *wq, const char *name),
TP_ARGS(wq, name, high)
TP_ARGS(wq, name)
);
DECLARE_EVENT_CLASS(btrfs__workqueue_done,
DECLARE_EVENT_CLASS(btrfs_workqueue_done,
TP_PROTO(const struct __btrfs_workqueue *wq),
TP_PROTO(const struct btrfs_workqueue *wq),
TP_ARGS(wq),
@ -1507,9 +1501,9 @@ DECLARE_EVENT_CLASS(btrfs__workqueue_done,
TP_printk_btrfs("wq=%p", __entry->wq)
);
DEFINE_EVENT(btrfs__workqueue_done, btrfs_workqueue_destroy,
DEFINE_EVENT(btrfs_workqueue_done, btrfs_workqueue_destroy,
TP_PROTO(const struct __btrfs_workqueue *wq),
TP_PROTO(const struct btrfs_workqueue *wq),
TP_ARGS(wq)
);