From: Artem Bityutskiy <dedekind1@gmail.com>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
chris.mason@oracle.com, david@fromorbit.com, hch@infradead.org,
akpm@linux-foundation.org, jack@suse.cz,
yanmin_zhang@linux.intel.com, richard@rsk.demon.co.uk,
damien.wyart@free.fr, fweisbec@gmail.com, Alan.Brunelle@hp.com
Subject: Re: [PATCH 05/10] writeback: support > 1 flusher thread per bdi
Date: Mon, 06 Jul 2009 16:37:55 +0300 [thread overview]
Message-ID: <4A51FE33.3070702@gmail.com> (raw)
In-Reply-To: <1245926523-21959-6-git-send-email-jens.axboe@oracle.com>
Jens Axboe wrote:
> +static void bdi_queue_work(struct backing_dev_info *bdi, struct bdi_work *work)
> +{
> + if (work) {
> + work->seen = bdi->wb_mask;
> + BUG_ON(!work->seen);
> + atomic_set(&work->pending, bdi->wb_cnt);
> + BUG_ON(!bdi->wb_cnt);
> +
> + /*
> + * Make sure stores are seen before it appears on the list
> + */
> + smp_mb();
> +
> + spin_lock(&bdi->wb_lock);
> + list_add_tail_rcu(&work->list, &bdi->work_list);
> + spin_unlock(&bdi->wb_lock);
> + }
Doesn't spin_lock() include an implicit memory barrier?
After &bdi->wb_lock is acquired, it is guaranteed that all
memory operations are finished.
--
Best Regards,
Artem Bityutskiy (Артём Битюцкий)
next prev parent reply other threads:[~2009-07-06 13:37 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-25 10:41 [PATCH 0/10] Per-bdi writeback flusher threads v12 Jens Axboe
2009-06-25 10:41 ` [PATCH 01/10] writeback: move dirty inodes from super_block to backing_dev_info Jens Axboe
2009-06-25 10:41 ` [PATCH 02/10] writeback: switch to per-bdi threads for flushing data Jens Axboe
2009-07-06 12:55 ` Artem Bityutskiy
2009-07-06 13:13 ` Jens Axboe
2009-07-06 13:26 ` Artem Bityutskiy
2009-07-07 15:27 ` Artem Bityutskiy
2009-07-08 0:57 ` Zhang, Yanmin
2009-07-08 4:47 ` Artem Bityutskiy
2009-06-25 10:41 ` [PATCH 03/10] writeback: get rid of pdflush completely Jens Axboe
2009-06-25 10:41 ` [PATCH 04/10] writeback: separate the flushing state/task from the bdi Jens Axboe
2009-06-25 10:41 ` [PATCH 05/10] writeback: support > 1 flusher thread per bdi Jens Axboe
2009-07-06 12:18 ` Artem Bityutskiy
2009-07-06 12:22 ` Jens Axboe
2009-07-06 13:37 ` Artem Bityutskiy [this message]
2009-07-06 13:49 ` Jamie Lokier
2009-07-06 14:11 ` Artem Bityutskiy
2009-07-06 15:43 ` Jens Axboe
2009-06-25 10:41 ` [PATCH 06/10] writeback: allow sleepy exit of default writeback task Jens Axboe
2009-06-25 10:42 ` [PATCH 07/10] writeback: add some debug inode list counters to bdi stats Jens Axboe
2009-06-25 10:42 ` [PATCH 08/10] writeback: add name to backing_dev_info Jens Axboe
2009-06-25 10:42 ` [PATCH 09/10] writeback: check for registered bdi in flusher add and inode dirty Jens Axboe
2009-06-25 10:42 ` [PATCH 10/10] writeback: use spin_trylock() in bdi_writeback_all() for WB_SYNC_NONE Jens Axboe
2009-06-29 8:43 ` [PATCH 0/10] Per-bdi writeback flusher threads v12 Zhang, Yanmin
-- strict thread matches above, loose matches on Subject: below --
2009-08-31 12:14 [PATCH 0/10] Per-bdi writeback flusher threads v14 Jens Axboe
2009-08-31 12:14 ` [PATCH 05/10] writeback: support > 1 flusher thread per bdi Jens Axboe
2009-08-31 13:01 ` Christoph Hellwig
2009-08-31 17:32 ` Jens Axboe
2009-06-17 11:07 [PATCH 0/10] Per-bdi writeback flusher threads v11 Jens Axboe
2009-06-17 11:07 ` [PATCH 05/10] writeback: support > 1 flusher thread per bdi Jens Axboe
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