linux-kernel - Re: [PATCH -next] block: Revert "block: increase BLKCG_MAX

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Date:   Fri, 3 Feb 2023 16:13:38 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     Oleksandr Natalenko <oleksandr@...alenko.name>, tj@...nel.org,
        axboe@...nel.dk, Yu Kuai <yukuai1@...weicloud.com>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com, yangerkun@...wei.com,
        "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH -next] block: Revert "block: increase BLKCG_MAX_POLS"

Hi,

在 2023/02/03 15:59, Oleksandr Natalenko 写道:
> Hello.
> 
> On pátek 3. února 2023 9:13:57 CET Yu Kuai wrote:
>> From: Yu Kuai <yukuai3@...wei.com>
>>
>> This reverts commit ec645dc96699ea6c37b6de86c84d7288ea9a4ddf.
>>
>> This can save some memory, because after commit 0f7839955114 ("Revert
>> "block/mq-deadline: Add cgroup support""), there are total 5 policies.
>>
>> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
>> ---
>>   include/linux/blkdev.h | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
>> index 41a41561b773..c6861c7fdad9 100644
>> --- a/include/linux/blkdev.h
>> +++ b/include/linux/blkdev.h
>> @@ -54,7 +54,7 @@ extern struct class block_class;
>>    * Maximum number of blkcg policies allowed to be registered concurrently.
>>    * Defined here to simplify include dependency.
>>    */
>> -#define BLKCG_MAX_POLS		6
>> +#define BLKCG_MAX_POLS		5
>>   
>>   #define DISK_MAX_PARTS			256
>>   #define DISK_NAME_LEN			32
> 
> Last time I asked about reverting this change, it was suggested that we may keep it [1].
> 
> [1] https://lore.kernel.org/linux-block/1dc051a8-4d59-8137-2406-f74026b170bd@kernel.dk/
> 

I see now, thanks for the reply.

Kuai