linux-kernel - Re: [PATCH] zonefs: Simplify the allocation of slab caches in zonefs_init

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Date: Mon, 19 Feb 2024 16:52:34 +0800
From: Kunwu Chan <chentao@...inos.cn>
To: Damien Le Moal <dlemoal@...nel.org>, naohiro.aota@....com, jth@...nel.org
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] zonefs: Simplify the allocation of slab caches in
 zonefs_init_inodecache

Thanks for the reply.

On 2024/2/9 12:06, Damien Le Moal wrote:
> On 2/5/24 17:10, Kunwu Chan wrote:
>> Use the new KMEM_CACHE() macro instead of direct kmem_cache_create
>> to simplify the creation of SLAB caches.
>>
>> Signed-off-by: Kunwu Chan <chentao@...inos.cn>
>> ---
>>   fs/zonefs/super.c | 6 ++----
>>   1 file changed, 2 insertions(+), 4 deletions(-)
>>
>> diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
>> index 93971742613a..9b578e7007e9 100644
>> --- a/fs/zonefs/super.c
>> +++ b/fs/zonefs/super.c
>> @@ -1387,10 +1387,8 @@ static struct file_system_type zonefs_type = {
>>   
>>   static int __init zonefs_init_inodecache(void)
>>   {
>> -	zonefs_inode_cachep = kmem_cache_create("zonefs_inode_cache",
>> -			sizeof(struct zonefs_inode_info), 0,
>> -			(SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT),
>> -			NULL);
>> +	zonefs_inode_cachep = KMEM_CACHE(zonefs_inode_info,
>> +			SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT);
>>   	if (zonefs_inode_cachep == NULL)
>>   		return -ENOMEM;
>>   	return 0;
> 
> I do not really see a meaningful simplification here. Using kmem_cache_create()
The main reason is 'it hides all the 0 or NULL parameters'.
> directly is not *that* complicated... Also, this changes the name of the cache
> from "zonefs_inode_cache" to "zonefs_inode_info".
Cache name is used in /proc/slabinfo to identify this cache.
>

Thank again for taking the time to review and reply.

-- 
Thanks,
   Kunwu