netdev - Re: Re: [RFC PATCH net-next 3/3] sock: Throttle pressure-aware sockets under pressure

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Date: Sun, 3 Sep 2023 12:54:52 +0800
From: Abel Wu <wuyun.abel@...edance.com>
To: Simon Horman <horms@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>,
 Shakeel Butt <shakeelb@...gle.com>, Roman Gushchin
 <roman.gushchin@...ux.dev>, Michal Hocko <mhocko@...e.com>,
 Johannes Weiner <hannes@...xchg.org>, Yosry Ahmed <yosryahmed@...gle.com>,
 Yu Zhao <yuzhao@...gle.com>, "Matthew Wilcox (Oracle)"
 <willy@...radead.org>, Kefeng Wang <wangkefeng.wang@...wei.com>,
 Yafang Shao <laoar.shao@...il.com>, Kuniyuki Iwashima <kuniyu@...zon.com>,
 Martin KaFai Lau <martin.lau@...nel.org>, Breno Leitao <leitao@...ian.org>,
 Alexander Mikhalitsyn <alexander@...alicyn.com>,
 David Howells <dhowells@...hat.com>, Jason Xing <kernelxing@...cent.com>,
 open list <linux-kernel@...r.kernel.org>,
 "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
 "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>
Subject: Re: Re: [RFC PATCH net-next 3/3] sock: Throttle pressure-aware
 sockets under pressure

Hi Simon, thanks for reviewing!

On 9/1/23 9:59 PM, Simon Horman wrote:
> On Fri, Sep 01, 2023 at 02:21:28PM +0800, Abel Wu wrote:
>> @@ -3087,8 +3100,20 @@ 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))
>> +		/* Be more conservative if the socket's memcg (or its
>> +		 * parents) is under reclaim pressure, try to possibly
>> +		 * avoid further memstall.
>> +		 */
>> +		if (under_memcg_pressure)
>> +			goto suppress_allocation;
>> +
>> +		if (!sk_under_global_memory_pressure(sk))
>>   			return 1;
>> +
>> +		/* Trying to be fair among all the sockets of same
>> +		 * protocal under global memory pressure, by allowing
> 
> nit: checkpatch.pl --codespell says, protocal -> protocol

Will fix in next version.

Thanks,
	Abel

> 
>> +		 * the ones that under average usage to raise.
>> +		 */
>>   		alloc = sk_sockets_allocated_read_positive(sk);
>>   		if (sk_prot_mem_limits(sk, 2) > alloc *
>>   		    sk_mem_pages(sk->sk_wmem_queued +
>> -- 
>> 2.37.3
>>
>>