linux-kernel - Re: [PATCH net-next 5/6] tcp: Simplify the allocation of slab caches

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Message-ID: <c7e92fee-42a0-43c3-8fab-cb0b3ab305ac@kylinos.cn>
Date: Mon, 19 Feb 2024 17:09:30 +0800
From: Kunwu Chan <chentao@...inos.cn>
To: Eric Dumazet <edumazet@...gle.com>
Cc: davem@...emloft.net, dsahern@...nel.org, kuba@...nel.org,
 pabeni@...hat.com, jiri@...nulli.us, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 5/6] tcp: Simplify the allocation of slab caches

Thanks for your reply.
On 2024/2/5 20:29, Eric Dumazet wrote:
> On Mon, Feb 5, 2024 at 8:23 AM Kunwu Chan <chentao@...inos.cn> wrote:
>>
>> Use the new KMEM_CACHE() macro instead of direct kmem_cache_create
>> to simplify the creation of SLAB caches.
>> And change cache name from 'tcp_bind_bucket' to 'inet_bind_bucket',
>> 'tcp_bind2_bucket' to 'inet_bind2_bucket'.
>>
>> Signed-off-by: Kunwu Chan <chentao@...inos.cn>
>> ---
>>   net/ipv4/tcp.c | 14 ++++----------
>>   1 file changed, 4 insertions(+), 10 deletions(-)
>>
>> diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
>> index a1c6de385cce..2dc3dd4323c2 100644
>> --- a/net/ipv4/tcp.c
>> +++ b/net/ipv4/tcp.c
>> @@ -4697,17 +4697,11 @@ void __init tcp_init(void)
>>                              thash_entries, 21,  /* one slot per 2 MB*/
>>                              0, 64 * 1024);
>>          tcp_hashinfo.bind_bucket_cachep =
>> -               kmem_cache_create("tcp_bind_bucket",
>> -                                 sizeof(struct inet_bind_bucket), 0,
>> -                                 SLAB_HWCACHE_ALIGN | SLAB_PANIC |
>> -                                 SLAB_ACCOUNT,
>> -                                 NULL);
>> +               KMEM_CACHE(inet_bind_bucket,
>> +                          SLAB_HWCACHE_ALIGN | SLAB_PANIC | SLAB_ACCOUNT);
> 
> I would prefer we do not do this.
> 
> dccp is also using a kmem_cache_create() of "struct inet_bind_bucket"
When i do my work, i found this too, so i just change the cache name in tcp.
> 
> We want different caches for TCP and DCCP.
For distinguishment, I'll delete this patch in next patch series.
> 
> 
>>          tcp_hashinfo.bind2_bucket_cachep =
>> -               kmem_cache_create("tcp_bind2_bucket",
>> -                                 sizeof(struct inet_bind2_bucket), 0,
>> -                                 SLAB_HWCACHE_ALIGN | SLAB_PANIC |
>> -                                 SLAB_ACCOUNT,
>> -                                 NULL);
>> +               KMEM_CACHE(inet_bind2_bucket,
>> +                          SLAB_HWCACHE_ALIGN | SLAB_PANIC | SLAB_ACCOUNT);
> 
> Same here.
> 
>>
>>          /* Size and allocate the main established and bind bucket
>>           * hash tables.
>> --
>> 2.39.2
>>
-- 
Thanks,
   Kunwu