From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 27520 invoked by alias); 4 Feb 2011 15:26:27 -0000 Received: (qmail 27487 invoked by uid 22791); 4 Feb 2011 15:26:26 -0000 X-SWARE-Spam-Status: No, hits=-6.8 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_HI,SPF_HELO_PASS,TW_EG,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 04 Feb 2011 15:26:16 +0000 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p14FPuG1023519 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 4 Feb 2011 10:25:56 -0500 Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id p14FPulQ003024; Fri, 4 Feb 2011 10:25:56 -0500 Received: from opsy.redhat.com (ovpn01.gateway.prod.ext.phx2.redhat.com [10.5.9.1]) by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id p14FPsCd032717; Fri, 4 Feb 2011 10:25:55 -0500 Received: by opsy.redhat.com (Postfix, from userid 500) id 93A1E3784E1; Fri, 4 Feb 2011 08:25:54 -0700 (MST) From: Tom Tromey To: Pedro Alves Cc: "Ulrich Weigand" , Markus Alber , Michael Snyder , gdb@sourceware.org Subject: Re: performance of multithreading gets gradually worse under gdb References: <201102032140.p13Le89f031563@d06av02.portsmouth.uk.ibm.com> <201102041455.20607.pedro@codesourcery.com> Date: Fri, 04 Feb 2011 15:26:00 -0000 In-Reply-To: <201102041455.20607.pedro@codesourcery.com> (Pedro Alves's message of "Fri, 4 Feb 2011 14:55:20 +0000") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Mailing-List: contact gdb-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sourceware.org X-SW-Source: 2011-02/txt/msg00026.txt.bz2 Pedro> Yeah. And only clear current_regcache_ptid if it was deleted in the Pedro> first place; and only reinit the frame cache if we deleted the Pedro> regcache of inferior_ptid ? Like the patch below. Yeah, this looks reasonable to me. Pedro> We have targets that do thread<->lwp ptid translation between Pedro> thread/proc stratum layers, and random places that do Pedro> get_thread_regcache (ptid) behind the core's back -- it appears Pedro> aix-thread.c could be one of those. Pedro> Another example: linux-nat.c:cancel_breakpoint builds Pedro> regcaches for lwps before linux-thread-db.c (if active at all) Pedro> has had a chance of telling the core about new Pedro> threads (in all-stop mode). Thanks for pointing this out. I have a lot to learn in this area. One somewhat distressing thing is that my patch did not cause any regressions. Tom