Subject: Re: [net-next,v2] tcp: Use per-vma locking for receive zerocopy

From: [email-masked]
Date: Sun, 18 Jun 2023 10:20:19 +0000

Hello:

This patch was applied to netdev/net-next.git (main)
by David S. Miller <[email-masked]>:

On Fri, 16 Jun 2023 12:34:27 -0700 you wrote:
> From: Arjun Roy <[email-masked]>
> 
> Per-VMA locking allows us to lock a struct vm_area_struct without
> taking the process-wide mmap lock in read mode.
> 
> Consider a process workload where the mmap lock is taken constantly in
> write mode. In this scenario, all zerocopy receives are periodically
> blocked during that period of time - though in principle, the memory
> ranges being used by TCP are not touched by the operations that need
> the mmap write lock. This results in performance degradation.
> 
> [...]

Here is the summary with links:
  - [net-next,v2] tcp: Use per-vma locking for receive zerocopy
    https://git.kernel.org/netdev/net-next/c/7a7f09463534

You are awesome, thank you!
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