netdev - Re: Re: [PATCH v2 4/4] sock: Remove redundant cond of memcg pressure

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Message-ID: <59a250f6-d38d-9fae-8835-4fd1c501d913@bytedance.com>
Date: Tue, 23 May 2023 11:04:22 +0800
From: Abel Wu <wuyun.abel@...edance.com>
To: Simon Horman <simon.horman@...igine.com>
Cc: "David S . Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Glauber Costa <glommer@...allels.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH v2 4/4] sock: Remove redundant cond of memcg pressure

Hi Simon, thanks for reviewing! I will fix the coding style issues
next version!

Thanks,
	Abel

On 5/22/23 8:54 PM, Simon Horman wrote:
> On Mon, May 22, 2023 at 03:01:22PM +0800, Abel Wu wrote:
>> Now with the preivous patch, __sk_mem_raise_allocated() considers
> 
> nit: s/preivous/previous/
> 
>> the memory pressure of both global and the socket's memcg on a func-
>> wide level, making the condition of memcg's pressure in question
>> redundant.
>>
>> Signed-off-by: Abel Wu <wuyun.abel@...edance.com>
>> ---
>>   net/core/sock.c | 7 ++++++-
>>   1 file changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/net/core/sock.c b/net/core/sock.c
>> index 7641d64293af..baccbb58a11a 100644
>> --- a/net/core/sock.c
>> +++ b/net/core/sock.c
>> @@ -3029,9 +3029,14 @@ int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
>>   	if (sk_has_memory_pressure(sk)) {
>>   		u64 alloc;
>>   
>> -		if (!sk_under_memory_pressure(sk))
>> +		if (!sk_under_global_memory_pressure(sk))
>>   			return 1;
>>   		alloc = sk_sockets_allocated_read_positive(sk);
>> +		/*
>> +		 * If under global pressure, allow the sockets that are below
>> +		 * average memory usage to raise, trying to be fair among all
>> +		 * the sockets under global constrains.
>> +		 */
> 
> nit:
> 		/* Multi-line comments in networking code
> 		 * look like this.
> 		 */
> 
>>   		if (sk_prot_mem_limits(sk, 2) > alloc *
>>   		    sk_mem_pages(sk->sk_wmem_queued +
>>   				 atomic_read(&sk->sk_rmem_alloc) +
>> -- 
>> 2.37.3
>>
>>