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Message-ID: <20150701073050.GX7252@quack.suse.cz>
Date: Wed, 1 Jul 2015 09:30:50 +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
Subject: Re: [PATCH 37/51] writeback: remove bdi_start_writeback()
On Fri 22-05-15 17:13:51, Tejun Heo wrote:
> bdi_start_writeback() is a thin wrapper on top of
> __wb_start_writeback() which is used only by laptop_mode_timer_fn().
> This patches removes bdi_start_writeback(), renames
> __wb_start_writeback() to wb_start_writeback() and makes
> laptop_mode_timer_fn() use it instead.
>
> This doesn't cause any functional difference and will ease making
> laptop_mode_timer_fn() cgroup writeback aware.
>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: Jan Kara <jack@...e.cz>
Looks good. You can add:
Reviewed-by: Jan Kara <jack@...e.com>
Honza
> ---
> fs/fs-writeback.c | 68 +++++++++++++++++----------------------------
> include/linux/backing-dev.h | 4 +--
> mm/page-writeback.c | 4 +--
> 3 files changed, 29 insertions(+), 47 deletions(-)
>
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index 921a9e4..79f11af 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -184,33 +184,6 @@ static void wb_queue_work(struct bdi_writeback *wb,
> spin_unlock_bh(&wb->work_lock);
> }
>
> -static void __wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
> - bool range_cyclic, enum wb_reason reason)
> -{
> - struct wb_writeback_work *work;
> -
> - if (!wb_has_dirty_io(wb))
> - return;
> -
> - /*
> - * This is WB_SYNC_NONE writeback, so if allocation fails just
> - * wakeup the thread for old dirty data writeback
> - */
> - work = kzalloc(sizeof(*work), GFP_ATOMIC);
> - if (!work) {
> - trace_writeback_nowork(wb->bdi);
> - wb_wakeup(wb);
> - return;
> - }
> -
> - work->sync_mode = WB_SYNC_NONE;
> - work->nr_pages = nr_pages;
> - work->range_cyclic = range_cyclic;
> - work->reason = reason;
> -
> - wb_queue_work(wb, work);
> -}
> -
> #ifdef CONFIG_CGROUP_WRITEBACK
>
> /**
> @@ -240,22 +213,31 @@ EXPORT_SYMBOL_GPL(inode_congested);
>
> #endif /* CONFIG_CGROUP_WRITEBACK */
>
> -/**
> - * bdi_start_writeback - start writeback
> - * @bdi: the backing device to write from
> - * @nr_pages: the number of pages to write
> - * @reason: reason why some writeback work was initiated
> - *
> - * Description:
> - * This does WB_SYNC_NONE opportunistic writeback. The IO is only
> - * started when this function returns, we make no guarantees on
> - * completion. Caller need not hold sb s_umount semaphore.
> - *
> - */
> -void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages,
> - enum wb_reason reason)
> +void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
> + bool range_cyclic, enum wb_reason reason)
> {
> - __wb_start_writeback(&bdi->wb, nr_pages, true, reason);
> + struct wb_writeback_work *work;
> +
> + if (!wb_has_dirty_io(wb))
> + return;
> +
> + /*
> + * This is WB_SYNC_NONE writeback, so if allocation fails just
> + * wakeup the thread for old dirty data writeback
> + */
> + work = kzalloc(sizeof(*work), GFP_ATOMIC);
> + if (!work) {
> + trace_writeback_nowork(wb->bdi);
> + wb_wakeup(wb);
> + return;
> + }
> +
> + work->sync_mode = WB_SYNC_NONE;
> + work->nr_pages = nr_pages;
> + work->range_cyclic = range_cyclic;
> + work->reason = reason;
> +
> + wb_queue_work(wb, work);
> }
>
> /**
> @@ -1219,7 +1201,7 @@ void wakeup_flusher_threads(long nr_pages, enum wb_reason reason)
>
> rcu_read_lock();
> list_for_each_entry_rcu(bdi, &bdi_list, bdi_list)
> - __wb_start_writeback(&bdi->wb, nr_pages, false, reason);
> + wb_start_writeback(&bdi->wb, nr_pages, false, reason);
> rcu_read_unlock();
> }
>
> diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
> index c797980..0ff40c2 100644
> --- a/include/linux/backing-dev.h
> +++ b/include/linux/backing-dev.h
> @@ -25,8 +25,8 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
> int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev);
> void bdi_unregister(struct backing_dev_info *bdi);
> int __must_check bdi_setup_and_register(struct backing_dev_info *, char *);
> -void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages,
> - enum wb_reason reason);
> +void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
> + bool range_cyclic, enum wb_reason reason);
> void bdi_start_background_writeback(struct backing_dev_info *bdi);
> void wb_workfn(struct work_struct *work);
> void wb_wakeup_delayed(struct bdi_writeback *wb);
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index 9b55f12..6301af2 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -1729,8 +1729,8 @@ void laptop_mode_timer_fn(unsigned long data)
> * threshold
> */
> if (bdi_has_dirty_io(&q->backing_dev_info))
> - bdi_start_writeback(&q->backing_dev_info, nr_pages,
> - WB_REASON_LAPTOP_TIMER);
> + wb_start_writeback(&q->backing_dev_info.wb, nr_pages, true,
> + WB_REASON_LAPTOP_TIMER);
> }
>
> /*
> --
> 2.4.0
>
--
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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