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Sun, 18 Jun 2023 10:20:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id 961D4C433D9; Sun, 18 Jun 2023 10:20:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1687083619; bh=PzTEnSq9qYk+OyGh4rp4xMPHDvA9Q/44FTRL5zNb+to=; h=Subject:From:Date:References:In-Reply-To:To:Cc:From; b=u9VZPYIUaUHcgnlJu+qEHM30rvpfHzO/7ih6JohjBorqvZieHTFsfSMBRfHqKxWrF Ym0SlHick/mbfg9kRRq0ITyyQpnPklLjfUcwRTRqYWLsrbN2nqcgai7wSsljqyyayB Ek2aBZNVcS8AavyiAJNClDxga5Bh+7tjI7lyUHKWBKF2DOjI9Iv8LiR1JOvWoZapqD c3RrWXUKR8x2UOfhq+lMzw8Srb2k3aye2akWgsSwjF4Y3Jxaj6Mic5qPLc2jkpPjYM FsCnx1tCikde57bwJRrNFilSPZP+AG/YnfqrLbpKIu5OioMMK3NxR+/B1RcveEf4E0 i8vGyh3UnBVGA== Received: from aws-us-west-2-korg-oddjob-1.ci.codeaurora.org (localhost.localdomain [127.0.0.1]) by aws-us-west-2-korg-oddjob-1.ci.codeaurora.org (Postfix) with ESMTP id 81B03E21EE5; Sun, 18 Jun 2023 10:20:19 +0000 (UTC) Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: Re: [net-next,v2] tcp: Use per-vma locking for receive zerocopy From: patchwork-bot+netdevbpf@kernel.org Message-Id: <168708361952.30416.4165448356299935816.git-patchwork-notify@kernel.org> Date: Sun, 18 Jun 2023 10:20:19 +0000 References: <20230616193427.3908429-1-arjunroy.kdev@gmail.com> In-Reply-To: <20230616193427.3908429-1-arjunroy.kdev@gmail.com> To: Arjun Roy Cc: netdev@vger.kernel.org, arjunroy@google.com, edumazet@google.com, soheil@google.com, kuba@kernel.org, akpm@linux-foundation.org, dsahern@kernel.org, davem@davemloft.net, linux-mm@kvack.org, pabeni@redhat.com X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 75088A0003 X-Stat-Signature: 9zuwq4x1d7hbachy8x7951c11u7xy656 X-Rspam-User: X-HE-Tag: 1687083621-415394 X-HE-Meta: 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 jFi1/Ms2 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hello: This patch was applied to netdev/net-next.git (main) by David S. Miller : On Fri, 16 Jun 2023 12:34:27 -0700 you wrote: > From: Arjun Roy > > 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! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html