linux-kernel - [PATCH] rds:Simplify the allocation of slab caches

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Date: Tue, 18 Jun 2024 15:21:21 +0800
From: Hongfu Li <lihongfu@...inos.cn>
To: yanjun.zhu@...ux.dev
Cc: allison.henderson@...cle.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	lihongfu@...inos.cn,
	linux-kernel@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org,
	pabeni@...hat.com,
	rds-devel@....oracle.com
Subject: [PATCH] rds:Simplify the allocation of slab caches

>> Use the new KMEM_CACHE() macro instead of direct kmem_cache_create
>> to simplify the creation of SLAB caches.
>> 
>> Signed-off-by: Hongfu Li <lihongfu@...inos.cn>
>> ---
>>   net/rds/tcp.c      | 4 +---
>>   net/rds/tcp_recv.c | 4 +---
>>   2 files changed, 2 insertions(+), 6 deletions(-)
>> 
>> diff --git a/net/rds/tcp.c b/net/rds/tcp.c
>> index d8111ac83bb6..3dc6956f66f8 100644
>> --- a/net/rds/tcp.c
>> +++ b/net/rds/tcp.c
>> @@ -719,9 +719,7 @@ static int __init rds_tcp_init(void)
>>   {
>>   	int ret;
>>   
>> -	rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection",
>> -					      sizeof(struct rds_tcp_connection),
>> -					      0, 0, NULL);
>> +	rds_tcp_conn_slab = KMEM_CACHE(rds_tcp_connection, 0);

>KMEM_CACHE is declared as below:
>
>/*
>  * Please use this macro to create slab caches. Simply specify the
>  * name of the structure and maybe some flags that are listed above.
>  *
>  * The alignment of the struct determines object alignment. If you
>  * f.e. add ____cacheline_aligned_in_smp to the struct declaration
>  * then the objects will be properly aligned in SMP configurations.
>  */
>#define KMEM_CACHE(__struct, __flags)                                   \
>                 kmem_cache_create(#__struct, sizeof(struct __struct),   \
>                         __alignof__(struct __struct), (__flags), NULL)

Sorry, I'll check it carefully next time.

Thanks, 

Hongfu Li

>>   	if (!rds_tcp_conn_slab) {
>>   		ret = -ENOMEM;
>>   		goto out;
>> diff --git a/net/rds/tcp_recv.c b/net/rds/tcp_recv.c
>> index c00f04a1a534..7997a19d1da3 100644
>> --- a/net/rds/tcp_recv.c
>> +++ b/net/rds/tcp_recv.c
>> @@ -337,9 +337,7 @@ void rds_tcp_data_ready(struct sock *sk)
>>   
>>   int rds_tcp_recv_init(void)
>>   {
>> -	rds_tcp_incoming_slab = kmem_cache_create("rds_tcp_incoming",
>> -					sizeof(struct rds_tcp_incoming),
>> -					0, 0, NULL);
>> +	rds_tcp_incoming_slab = KMEM_CACHE(rds_tcp_incoming, 0);
>>   	if (!rds_tcp_incoming_slab)
>>   		return -ENOMEM;
>>   	return 0;