From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752093AbdBCT1H (ORCPT ); Fri, 3 Feb 2017 14:27:07 -0500 Received: from outbound.smtp.vt.edu ([198.82.183.121]:38896 "EHLO omr2.cc.vt.edu" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752058AbdBCT1F (ORCPT ); Fri, 3 Feb 2017 14:27:05 -0500 From: valdis.kletnieks@vt.edu X-Google-Original-From: Valdis.Kletnieks@vt.edu X-Mailer: exmh version 2.8.0 04/21/2012 with nmh-1.6+dev To: Waiman Long Cc: Thomas Gleixner , Ingo Molnar , Peter Zijlstra , Jonathan Corbet , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Arnaldo Carvalho de Melo , Davidlohr Bueso , Mike Galbraith , Scott J Norton Subject: Re: [PATCH-tip v5 17/21] TP-futex: Group readers together in wait queue In-Reply-To: <275d5112-eaa8-1158-b26d-4e18c8bf79e1@redhat.com> References: <1486145034-22210-1-git-send-email-longman@redhat.com> <1486145034-22210-18-git-send-email-longman@redhat.com> <13281.1486146235@turing-police.cc.vt.edu> <275d5112-eaa8-1158-b26d-4e18c8bf79e1@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1486150017_2881P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Fri, 03 Feb 2017 14:26:57 -0500 Message-ID: <18211.1486150017@turing-police.cc.vt.edu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --==_Exmh_1486150017_2881P Content-Type: text/plain; charset=us-ascii On Fri, 03 Feb 2017 13:42:46 -0500, Waiman Long said: > This patch set does guarantee some minimum performance level, but it > can't guarantee fairness for all the lock waiters. OK, sounds like it's a situation that's statistically unlikely, but it has protections against starvation so the system will eventually dig itself out of the hole, and the scenario is at least known and understood. The improved numbers for average-case probably outweigh the worst-case then... --==_Exmh_1486150017_2881P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Comment: Exmh version 2.5 07/13/2001 iQEVAwUBWJTZgI0DS38y7CIcAQI9yQgAqSsg76z6LtVNuQWtjkBKyMThbiD7JNeL ApeGwKRvqkt7YFB3IZW18bXWkS5YOB5Mj+Iv7tRvN7LoU2dFzYQsg9wFD98ofCOh W+K4eSadnePXphg+ke3g0j75h+SRYwqI0KElRFgk9Y/vRyrNlf/AqTK9VQPpHOoE BvP0/zb448tBaf3uH7UTtINzWkrONiNw1ANVpfVsD0QQSsWRViwTt7kGCzhdEGJD RaUZz/hQwezS1ZV/bw6seNB4dtZfUVTpMXQ7Zot4XbQR5gor+5E8x1dwGCQthOH/ yVJ3LSRs1xHIpAdFJAAmBm4NSGRJrN/52/jPftDZA/45/HeyAmQI/A== =GBuB -----END PGP SIGNATURE----- --==_Exmh_1486150017_2881P--