linux-kernel - Re: [PATCH -next] zram: fix compr_data

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Date:   Mon, 14 Aug 2017 17:08:05 +0900
From:   Minchan Kim <minchan@...nel.org>
To:     Yisheng Xie <xieyisheng1@...wei.com>
Cc:     akpm@...ux-foundation.org, ngupta@...are.org,
        sergey.senozhatsky.work@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] zram: fix compr_data_size stat

Hi Yisheng,

Thanks for the all fixup!
A minor nitpick below:

On Fri, Aug 11, 2017 at 09:10:32AM +0800, Yisheng Xie wrote:
> The compr_data_size is a stat for compressed size of pages stored, which
> should add comp_len when we compresse a page.
> 
> Meanwhile fix typos in comment:
> * ZRAM_SAME means page consists the same element not the entirely zero page
> * read_from_bdev_async() return 1 to avoid call page_endio() in zram_rw_page()
> 
> Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
> ---
>  drivers/block/zram/zram_drv.c | 3 ++-
>  drivers/block/zram/zram_drv.h | 2 +-
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index e27daca..b2b75b1 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -455,7 +455,7 @@ void zram_page_end_io(struct bio *bio)
>  }
>  
>  /*
> - * Returns 0 if the submission is successful.
> + * Returns 1 if the submission is successful.
>   */
>  static int read_from_bdev_async(struct zram *zram, struct bio_vec *bvec,
>  			unsigned long entry, struct bio *parent)
> @@ -1073,6 +1073,7 @@ static int __zram_bvec_write(struct zram *zram, struct bio_vec *bvec,
>  	}  else {
>  		zram_set_handle(zram, index, handle);
>  		zram_set_obj_size(zram, index, comp_len);
> +		atomic64_add(comp_len, &zram->stats.compr_data_size);

I want to add the accounting line to zs_unmap_object.
Otherwise, looks good to me.
Thanks!