netdev - Re: [PATCH v2 3/4] sock: Consider memcg pressure when raising sockmem

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Date: Mon, 22 May 2023 14:53:09 +0200
From: Simon Horman <simon.horman@...igine.com>
To: Abel Wu <wuyun.abel@...edance.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: [PATCH v2 3/4] sock: Consider memcg pressure when raising sockmem

On Mon, May 22, 2023 at 03:01:21PM +0800, Abel Wu wrote:
> For now __sk_mem_raise_allocated() mainly considers global socket
> memory pressure and allows to raise if no global pressure observed,
> including the sockets whose memcgs are in pressure, which might
> result in longer memcg memstall.
> 
> So take net-memcg's pressure into consideration when allocating
> socket memory to alleviate long tail latencies.
> 
> Signed-off-by: Abel Wu <wuyun.abel@...edance.com>
> ---
>  net/core/sock.c | 23 ++++++++++++++++-------
>  1 file changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/net/core/sock.c b/net/core/sock.c
> index 801df091e37a..7641d64293af 100644
> --- a/net/core/sock.c
> +++ b/net/core/sock.c
> @@ -2977,21 +2977,30 @@ int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
>  {
>  	bool memcg_charge = mem_cgroup_sockets_enabled && sk->sk_memcg;
>  	struct proto *prot = sk->sk_prot;
> -	bool charged = true;
> +	bool charged = true, pressured = false;
>  	long allocated;

Please preserve reverse xmas tree - longest line to shortest -
for local variables in neworking code.

...

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