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

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Message-ID: <e1e3868d-9535-dba3-d1ec-a40d102e7fd8@huawei.com>
Date:   Mon, 14 Aug 2017 18:53:20 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     Minchan Kim <minchan@...nel.org>
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



On 2017/8/14 17:34, Minchan Kim wrote:
> On Mon, Aug 14, 2017 at 05:24:16PM +0800, Yisheng Xie wrote:
>> Hi, Minchan
>>
>> Thanks for your comment!
>> On 2017/8/14 16:08, Minchan Kim wrote:
>>> 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.
>>
>> Right, this accounting can be done without slot lock!
>>
>> You will fold this patch? or should I send another version?
> 
> Could you separate same element comment part and others?

Of course.

> With that, we can apply same element comment correctpart
> and fold other parts which fixes writeback feature bugs
> to original patches.
> 
> Thanks!
> 
> .
>