linux-kernel - Re: [PATCH 42/51] writeback: make wakeup_dirtytime_writeback() handle multiple bdi

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Date:	Wed, 1 Jul 2015 10:20:15 +0200
From:	Jan Kara <jack@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org, jack@...e.cz,
	hch@...radead.org, hannes@...xchg.org,
	linux-fsdevel@...r.kernel.org, vgoyal@...hat.com,
	lizefan@...wei.com, cgroups@...r.kernel.org, linux-mm@...ck.org,
	mhocko@...e.cz, clm@...com, fengguang.wu@...el.com,
	david@...morbit.com, gthelen@...gle.com, khlebnikov@...dex-team.ru,
	Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH 42/51] writeback: make wakeup_dirtytime_writeback()
 handle multiple bdi_writeback's

On Fri 22-05-15 17:13:56, Tejun Heo wrote:
> wakeup_dirtytime_writeback() currently only starts writeback on the
> root wb (bdi_writeback).  For cgroup writeback support, update the
> function to check all wbs.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: Jan Kara <jack@...e.cz>
> Cc: Theodore Ts'o <tytso@....edu>

Looks good. You can add:

Reviewed-by: Jan Kara <jack@...e.com>

								Honza

> ---
>  fs/fs-writeback.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index 508e10c..8ae212e 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -1260,9 +1260,12 @@ static void wakeup_dirtytime_writeback(struct work_struct *w)
>  
>  	rcu_read_lock();
>  	list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) {
> -		if (list_empty(&bdi->wb.b_dirty_time))
> -			continue;
> -		wb_wakeup(&bdi->wb);
> +		struct bdi_writeback *wb;
> +		struct wb_iter iter;
> +
> +		bdi_for_each_wb(wb, bdi, &iter, 0)
> +			if (!list_empty(&bdi->wb.b_dirty_time))
> +				wb_wakeup(&bdi->wb);
>  	}
>  	rcu_read_unlock();
>  	schedule_delayed_work(&dirtytime_work, dirtytime_expire_interval * HZ);
> -- 
> 2.4.0
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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