linux-kernel - Re: [PATCH 10/10] fs: make aio plug

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Date:	Mon, 24 Jan 2011 12:59:29 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	linux-kernel@...r.kernel.org, hch@...radead.org,
	Shaohua Li <shaohua.li@...el.com>
Subject: Re: [PATCH 10/10] fs: make aio plug

Jens Axboe <jaxboe@...ionio.com> writes:

> From: Shaohua Li <shaohua.li@...el.com>
>
> Signed-off-by: Shaohua Li <shaohua.li@...el.com>
> Signed-off-by: Jens Axboe <jaxboe@...ionio.com>
> ---
>  fs/aio.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
>
> diff --git a/fs/aio.c b/fs/aio.c
> index c5ea494..1476bed 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -1660,6 +1660,7 @@ long do_io_submit(aio_context_t ctx_id, long nr,
>  	long ret = 0;
>  	int i;
>  	struct hlist_head batch_hash[AIO_BATCH_HASH_SIZE] = { { 0, }, };
> +	struct blk_plug plug;
>  
>  	if (unlikely(nr < 0))
>  		return -EINVAL;
> @@ -1676,6 +1677,8 @@ long do_io_submit(aio_context_t ctx_id, long nr,
>  		return -EINVAL;
>  	}
>  
> +	blk_start_plug(&plug);
> +
>  	/*
>  	 * AKPM: should this return a partial result if some of the IOs were
>  	 * successfully submitted?
> @@ -1698,6 +1701,7 @@ long do_io_submit(aio_context_t ctx_id, long nr,
>  		if (ret)
>  			break;
>  	}
> +	blk_finish_plug(&plug);
>  	aio_batch_free(batch_hash);

I'm pretty sure you want blk_finish_plug to run after aio_batch_free.

Cheers,
Jeff
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