From patchwork Fri Feb 12 23:22:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Dumazet X-Patchwork-Id: 382690 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BEC59C433DB for ; Fri, 12 Feb 2021 23:23:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6264064E12 for ; Fri, 12 Feb 2021 23:23:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232080AbhBLXXE (ORCPT ); Fri, 12 Feb 2021 18:23:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229497AbhBLXXB (ORCPT ); Fri, 12 Feb 2021 18:23:01 -0500 Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10D21C061574 for ; Fri, 12 Feb 2021 15:22:20 -0800 (PST) Received: by mail-pj1-x102f.google.com with SMTP id gx20so499478pjb.1 for ; Fri, 12 Feb 2021 15:22:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=KXFnznE5FVws9+sJal3HSEQZnFJ0Ou0tSrN9gBeSsa4=; b=tSsaTdf5Df5WqvsQnOVKUCC9FjPOACV0tKxG3+NkQW3ED3PL6enaj4yFbE8w3Lj3EA frX2Ptp3SkWDxuJSbPwkjqlWAPvre9hdhM9yjyloxHHOYyVo+SdWeD0eDLPARdD2RKoJ W8qe6QhI3pjdPx1aKJnw1c947NQEkudHU3xqv3qSKhZ8MzNqrrXMSJHY43xyAc9AUYpy 5bQCSUenLk67wSURyumCLBmY/LnM4WBSMej9o9MZZsCcwvQcwN99VJaXg87FJ35Ov26S vnzF1U3KWTqSp7q+V1cuqgpSqu9NxiTDF3w8cGKEWCEFJHBJ3hf7Jonip99B/JcM6SJJ H2Gw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=KXFnznE5FVws9+sJal3HSEQZnFJ0Ou0tSrN9gBeSsa4=; b=pcb/MxIl8xFcHUBFu8r9MA+VJIHKtjNGhkF1hl1GT0RnDNNYNzLyIznbGUOZwYCzvr hZjt2kLV6suU2EvCcHcmqUXjTz32P0+3uFerYgX/vRyCxgt0f17HoScO2FksS4aMq4JC QBaFZP2QQVb+smG8sJjTQEuq5fBfB1rD+ikOcL4P/l+PUV/uzyYPuWSYmHVV9L9ke6Jq 78Rx8kcuBjNsMMChq8NqdSceE87fma7fE52bo3Ah9kdhQsJEoc/9/5bsHd+KsQQlMgB6 YuQWT5SzYD9ZUB4v9JKc4bwiqjBBCI+5VQ+LjUEKiXYps6KKS4hPZx8LkeVeSfyZnzDK tuEQ== X-Gm-Message-State: AOAM532wY3DU+XbFxl6OBHMlsQDf0e3jVPrlSR7M/wETt1XElsJa1k05 dHJIlM6pfnStbG/5ebpBnbc= X-Google-Smtp-Source: ABdhPJyVSqD4ORSiIPAWuHbN0Qra0gMbh4rVCbzWrJ19I0kHvAPc0p1yaSYQt3jEhsY5gxkGREJaVw== X-Received: by 2002:a17:90a:4888:: with SMTP id b8mr4760533pjh.106.1613172139493; Fri, 12 Feb 2021 15:22:19 -0800 (PST) Received: from edumazet1.svl.corp.google.com ([2620:15c:2c4:201:449f:1ef7:3640:824a]) by smtp.gmail.com with ESMTPSA id f7sm9160614pjh.45.2021.02.12.15.22.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Feb 2021 15:22:18 -0800 (PST) From: Eric Dumazet To: "David S . Miller" , Jakub Kicinski Cc: netdev , Eric Dumazet , Eric Dumazet Subject: [PATCH net-next 0/2] tcp: mem pressure vs SO_RCVLOWAT Date: Fri, 12 Feb 2021 15:22:12 -0800 Message-Id: <20210212232214.2869897-1-eric.dumazet@gmail.com> X-Mailer: git-send-email 2.30.0.478.g8a0d178c01-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Eric Dumazet First patch fixes an issue for applications using SO_RCVLOWAT to reduce context switches. Second patch is a cleanup. Eric Dumazet (2): tcp: fix SO_RCVLOWAT related hangs under mem pressure tcp: factorize logic into tcp_epollin_ready() include/net/tcp.h | 21 +++++++++++++++++++-- net/ipv4/tcp.c | 16 ++++------------ net/ipv4/tcp_input.c | 11 ++--------- 3 files changed, 25 insertions(+), 23 deletions(-)