netdev - Re: [PATCH v3 net-next 1/5] net: expedite synchronize_net() for cleanup

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Message-ID: <b7473f0a-6f0b-434c-ae6e-3505c4b7e5db@linux.dev>
Date: Tue, 14 Jan 2025 14:57:42 -0800
From: Jesse Brandeburg <jesse.brandeburg@...ux.dev>
To: Eric Dumazet <edumazet@...gle.com>, "David S . Miller"
 <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, Simon Horman <horms@...nel.org>,
 eric.dumazet@...il.com, "jbrandeb@...nel.org" <jbrandeb@...nel.org>
Subject: Re: [PATCH v3 net-next 1/5] net: expedite synchronize_net() for
 cleanup_net()

On 1/14/25 12:55 PM, Eric Dumazet wrote:
> cleanup_net() is the single thread responsible
> for netns dismantles, and a serious bottleneck.
> 
> Before we can get per-netns RTNL, make sure
> all synchronize_net() called from this thread
> are using rcu_synchronize_expedited().
> 
> v3: deal with CONFIG_NET_NS=n
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Seems like a good cleanup!

Reviewed-by: Jesse Brandeburg <jbrandeburg@...udflare.com>