Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753014AbdHWALT (ORCPT ); Tue, 22 Aug 2017 20:11:19 -0400 Received: from smtp-fw-9102.amazon.com ([207.171.184.29]:2852 "EHLO smtp-fw-9102.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752964AbdHWALR (ORCPT ); Tue, 22 Aug 2017 20:11:17 -0400 X-IronPort-AV: E=Sophos;i="5.41,414,1498521600"; d="scan'208";a="562463808" From: Vallish Vaidyeshwara To: , , , , , CC: , , Subject: [PATCH v2 0/2] enable hires timer to timeout datagram socket Date: Wed, 23 Aug 2017 00:10:25 +0000 Message-ID: <1503447027-44399-1-git-send-email-vallish@amazon.com> X-Mailer: git-send-email 2.7.3.AMZN MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1849 Lines: 46 v1->v2: - Cong Wang pointed out MAX_SCHEDULE_TIMEOUT wraparound, fixed the patch 1/2 to accommodate MAX_SCHEDULE_TIMEOUT wait time - Changed format of printing total time from float to long in selftests patch 2/2 Hello Dave, Resending the patch series to include netdev mailing list with a cover letter. I am submitting 2 patch series to enable hires timer to timeout datagram sockets (AF_UNIX & AF_INET domain) and test code to test timeout accuracy on these sockets. There has been a behavior change in 4.9 kernel with refactoring of Kernel timer wheel in 4.8. We have a use case wherein our datagram socket application is sensitive to socket timeout including long timeouts. One of the test runs with a timeout value of 180 seconds timed out at 190 seconds. [root@]# ./datagram_sock_timeout 180000 datagram_sock_timeout failed: took 190.00 seconds [root@]# The same program when run on a 4.4 kernel would timeout more accurately and the kernel added slack was not noticeable to user application. Patch 1: Has core code change of enabling hires timer to timeout datagram socket on AF_UNIX and AF_INET domain Patch 2: Test code to report regression in timeout behavior related to patch 1 Vallish Vaidyeshwara (2): net: enable high resolution timer mode to timeout datagram sockets selftests/net: add test to verify datagram socket timeout net/core/datagram.c | 14 ++- tools/testing/selftests/net/Makefile | 3 +- .../testing/selftests/net/datagram_sock_timeout.c | 119 +++++++++++++++++++++ .../selftests/net/run_datagram_sock_timeout.sh | 12 +++ 4 files changed, 146 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/net/datagram_sock_timeout.c create mode 100755 tools/testing/selftests/net/run_datagram_sock_timeout.sh -- 2.7.3.AMZN