linux/fs/btrfs/async-thread.h
David Sterba 078b8b90b8 btrfs: merge ordered work callbacks in btrfs_work into one
There are two callbacks defined in btrfs_work but only two actually make
use of them, otherwise there are NULLs. We can get rid of the freeing
callback making it a special case of the normal work. This reduces the
size of btrfs_work by 8 bytes, final layout:

struct btrfs_work {
        btrfs_func_t               func;                 /*     0     8 */
        btrfs_ordered_func_t       ordered_func;         /*     8     8 */
        struct work_struct         normal_work;          /*    16    32 */
        struct list_head           ordered_list;         /*    48    16 */
        /* --- cacheline 1 boundary (64 bytes) --- */
        struct btrfs_workqueue *   wq;                   /*    64     8 */
        long unsigned int          flags;                /*    72     8 */

        /* size: 80, cachelines: 2, members: 6 */
        /* last cacheline: 16 bytes */
};

This in turn reduces size of other structures (on a release config):

- async_chunk			 160 ->  152
- async_submit_bio		 152 ->  144
- btrfs_async_delayed_work	 104 ->   96
- btrfs_caching_control		 176 ->  168
- btrfs_delalloc_work		 144 ->  136
- btrfs_fs_info			3608 -> 3600
- btrfs_ordered_extent		 440 ->  424
- btrfs_writepage_fixup		 104 ->   96

Signed-off-by: David Sterba <dsterba@suse.com>
2023-10-12 16:44:10 +02:00

49 lines
1.6 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2007 Oracle. All rights reserved.
* Copyright (C) 2014 Fujitsu. All rights reserved.
*/
#ifndef BTRFS_ASYNC_THREAD_H
#define BTRFS_ASYNC_THREAD_H
#include <linux/workqueue.h>
struct btrfs_fs_info;
struct btrfs_workqueue;
struct btrfs_work;
typedef void (*btrfs_func_t)(struct btrfs_work *arg);
typedef void (*btrfs_ordered_func_t)(struct btrfs_work *arg, bool);
struct btrfs_work {
btrfs_func_t func;
btrfs_ordered_func_t ordered_func;
/* Don't touch things below */
struct work_struct normal_work;
struct list_head ordered_list;
struct btrfs_workqueue *wq;
unsigned long flags;
};
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_ordered_workqueue(
struct btrfs_fs_info *fs_info, const char *name,
unsigned int flags);
void btrfs_init_work(struct btrfs_work *work, btrfs_func_t func,
btrfs_ordered_func_t ordered_func);
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);
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);
bool btrfs_workqueue_normal_congested(const struct btrfs_workqueue *wq);
void btrfs_flush_workqueue(struct btrfs_workqueue *wq);
#endif