linux-kernel - Re: [PATCH 3/3] ramzswap: Handler for swap slot free callback

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Date:	Mon, 17 May 2010 21:03:57 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Nitin Gupta <ngupta@...are.org>
Cc:	Greg KH <greg@...ah.com>, Pekka Enberg <penberg@...helsinki.fi>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nigel Cunningham <nigel@...onice.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Cyp <cyp561@...il.com>, driverdev <devel@...verdev.osuosl.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] ramzswap: Handler for swap slot free callback

On Mon, May 17, 2010 at 2:32 PM, Nitin Gupta <ngupta@...are.org> wrote:
> Install handler for swap_slot_free_notify callback which is called
> when a swap slot is no longer used. This handler immediately frees
> memory allocated corresponding to the given swap slot.
>
> Signed-off-by: Nitin Gupta <ngupta@...are.org>
> ---
>  drivers/staging/ramzswap/TODO           |    5 -----
>  drivers/staging/ramzswap/ramzswap_drv.c |   22 +++++++++++++---------
>  2 files changed, 13 insertions(+), 14 deletions(-)
>  delete mode 100644 drivers/staging/ramzswap/TODO
>
> diff --git a/drivers/staging/ramzswap/TODO b/drivers/staging/ramzswap/TODO
> deleted file mode 100644
> index 8d64e28..0000000
> --- a/drivers/staging/ramzswap/TODO
> +++ /dev/null
> @@ -1,5 +0,0 @@
> -TODO:
> -       - Add support for swap notifiers
> -
> -Please send patches to Greg Kroah-Hartman <greg@...ah.com> and
> -Nitin Gupta <ngupta@...are.org>
> diff --git a/drivers/staging/ramzswap/ramzswap_drv.c b/drivers/staging/ramzswap/ramzswap_drv.c
> index ee5eb12..ab15276 100644
> --- a/drivers/staging/ramzswap/ramzswap_drv.c
> +++ b/drivers/staging/ramzswap/ramzswap_drv.c
> @@ -795,14 +795,6 @@ static int ramzswap_write(struct ramzswap *rzs, struct bio *bio)
>
>        src = rzs->compress_buffer;
>
> -       /*
> -        * System swaps to same sector again when the stored page
> -        * is no longer referenced by any process. So, its now safe
> -        * to free the memory that was allocated for this page.
> -        */
> -       if (rzs->table[index].page || rzs_test_flag(rzs, index, RZS_ZERO))
> -               ramzswap_free_page(rzs, index);
> -
>        mutex_lock(&rzs->lock);
>
>        user_mem = kmap_atomic(page, KM_USER0);
> @@ -1295,9 +1287,21 @@ out:
>        return ret;
>  }
>
> +void ramzswap_slot_free_notify(struct block_device *bdev, unsigned long index)
> +{
> +       struct ramzswap *rzs;
> +
> +       rzs = bdev->bd_disk->private_data;
> +       ramzswap_free_page(rzs, index);
> +       rzs_stat64_inc(rzs, &rzs->stats.notify_free);
> +
> +       return;
> +}

Mistake. Let's remove _return_ in void function.
Otherwise, looks good to me.

Reviewed-by: Minchan Kim <minchan.kim@...il.com>


-- 
Kind regards,
Minchan Kim
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