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mm: hide laptop_mode_wb_timer entirely behind the BDI API 

Don't leak the detaіls of the timer into the block layer, instead
initialize the timer in bdi_alloc and delete it in bdi_unregister.
Note that this means the timer is initialized (but not armed) for
non-block queues as well now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20210809141744.1203023-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-08-09 16:17:40 +02:00 committed by Jens Axboe
parent d1254a8749
commit 5ed964f8e5
3 changed files with 3 additions and 7 deletions
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5
block/blk-core.c
View File

@ -394,10 +394,7 @@ void blk_cleanup_queue(struct request_queue *q)
/* for synchronous bio-based driver finish in-flight integrity i/o */
blk_flush_integrity();
/* @q won't process any more request, flush async actions */
del_timer_sync(&q->backing_dev_info->laptop_mode_wb_timer);
blk_sync_queue(q);
if (queue_is_mq(q))
blk_mq_exit_queue(q);
@ -546,8 +543,6 @@ struct request_queue *blk_alloc_queue(int node_id)
atomic_set(&q->nr_active_requests_shared_sbitmap, 0);
timer_setup(&q->backing_dev_info->laptop_mode_wb_timer,
laptop_mode_timer_fn, 0);
timer_setup(&q->timeout, blk_rq_timed_out_timer, 0);
INIT_WORK(&q->timeout_work, blk_timeout_work);
INIT_LIST_HEAD(&q->icq_list);

3
mm/backing-dev.c
View File

@ -807,6 +807,7 @@ struct backing_dev_info *bdi_alloc(int node_id)
bdi->capabilities = BDI_CAP_WRITEBACK | BDI_CAP_WRITEBACK_ACCT;
bdi->ra_pages = VM_READAHEAD_PAGES;
bdi->io_pages = VM_READAHEAD_PAGES;
timer_setup(&bdi->laptop_mode_wb_timer, laptop_mode_timer_fn, 0);
return bdi;
}
EXPORT_SYMBOL(bdi_alloc);
@ -928,6 +929,8 @@ static void bdi_remove_from_list(struct backing_dev_info *bdi)
void bdi_unregister(struct backing_dev_info *bdi)
{
del_timer_sync(&bdi->laptop_mode_wb_timer);
/* make sure nobody finds us on the bdi_list anymore */
bdi_remove_from_list(bdi);
wb_shutdown(&bdi->wb);

2
mm/page-writeback.c
View File

@ -2010,7 +2010,6 @@ int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
return ret;
}
#ifdef CONFIG_BLOCK
void laptop_mode_timer_fn(struct timer_list *t)
{
struct backing_dev_info *backing_dev_info =
@ -2045,7 +2044,6 @@ void laptop_sync_completion(void)
rcu_read_unlock();
}
#endif
/*
* If ratelimit_pages is too high then we can get into dirty-data overload