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writeback: pass in '0' for nr_pages writeback in laptop mode 

Laptop mode really wants to writeback the number of dirty
pages and inodes. Instead of calculating this in the caller,
just pass in 0 and let wakeup_flusher_threads() handle it.

Use the new wakeup_flusher_threads_bdi() instead of rolling
our own.

Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Tested-by: Chris Mason <clm@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2017-09-28 11:28:02 -06:00
parent 595043e5f9
commit 0ab29fd0ac
1 changed files with 1 additions and 16 deletions
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17
mm/page-writeback.c
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@ -1980,23 +1980,8 @@ int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
void laptop_mode_timer_fn(unsigned long data)
{
struct request_queue *q = (struct request_queue *)data;
int nr_pages = global_node_page_state(NR_FILE_DIRTY) +
global_node_page_state(NR_UNSTABLE_NFS);
struct bdi_writeback *wb;
/*
* We want to write everything out, not just down to the dirty
* threshold
*/
if (!bdi_has_dirty_io(q->backing_dev_info))
return;
rcu_read_lock();
list_for_each_entry_rcu(wb, &q->backing_dev_info->wb_list, bdi_node)
if (wb_has_dirty_io(wb))
wb_start_writeback(wb, nr_pages,
WB_REASON_LAPTOP_TIMER);
rcu_read_unlock();
wakeup_flusher_threads_bdi(q->backing_dev_info, WB_REASON_LAPTOP_TIMER);
}
/*