Re: [PATCH 7/9] zram: use the default discard granularity

[Jens Axboe <axboe@kernel.dk>]

On 1/2/24 8:44 AM, Jens Axboe wrote:
> On 1/2/24 8:40 AM, Jens Axboe wrote:
>> On 1/1/24 6:15 PM, Sergey Senozhatsky wrote:
>>> On (23/12/28 07:55), Christoph Hellwig wrote:
>>>>
>>>> The discard granularity now defaults to a single sector, so don't set
>>>> that value explicitly
>>>
>>> Hmm, but sector size != PAGE_SIZE
>>>
>>> [..]
>>>
>>>> @@ -2227,7 +2227,6 @@ static int zram_add(void)
>>>>  					ZRAM_LOGICAL_BLOCK_SIZE);
>>>>  	blk_queue_io_min(zram->disk->queue, PAGE_SIZE);
>>>>  	blk_queue_io_opt(zram->disk->queue, PAGE_SIZE);
>>>> -	zram->disk->queue->limits.discard_granularity = PAGE_SIZE;
>>
>> Yep, that does indeed look buggy.
> 
> Ah no it's fine, it'll default to the sector size of the device, which
> is set before the discard limit/granularity. So should work fine as-is.

Replying to myself again... It does then default it to the logical block
size, not the physical one. Which does look odd, seems like that should
be the physical size?

In any case, this does change behavior for zram.

Christoph?

-- 
Jens Axboe