From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 8515 invoked by alias); 16 Feb 2011 20:15:07 -0000 Mailing-List: contact archer-help@sourceware.org; run by ezmlm Sender: Precedence: bulk List-Post: List-Help: List-Subscribe: List-Id: Received: (qmail 8503 invoked by uid 22791); 16 Feb 2011 20:15:06 -0000 X-SWARE-Spam-Status: No, hits=-6.4 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_HI,SPF_HELO_PASS,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Date: Wed, 16 Feb 2011 20:15:00 -0000 From: Oleg Nesterov To: Roland McGrath Cc: Jan Kratochvil , Project Archer Subject: Re: ptrace improvement: PTRACE_O_INHERIT Message-ID: <20110216200654.GB17601@redhat.com> References: <20110212005855.E764C1814A4@magilla.sf.frob.com> <20110212190253.GA31866@redhat.com> <20110214193052.3EC8D1814BA@magilla.sf.frob.com> <20110214193812.GA20765@redhat.com> <20110215003551.BC1EA1802A2@magilla.sf.frob.com> <20110215130805.GA30742@redhat.com> <20110215214333.GA18086@host1.dyn.jankratochvil.net> <20110215220153.470031806E0@magilla.sf.frob.com> <20110216194010.GC15576@redhat.com> <20110216200201.7895218020E@magilla.sf.frob.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110216200201.7895218020E@magilla.sf.frob.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-SW-Source: 2011-q1/txt/msg00071.txt.bz2 On 02/16, Roland McGrath wrote: > > > At first glance, this should be more or less straightforward. I think. > > > > (btw, this is obviously much more difficult with utrace, we can't > > utrace_attach_task() under tasklist). > > Indeed. We might have to resort to a loop chasing untraced clones or > something. Or, attach can use a mutex in engine->data and synchronize with its own report_clone/report_death callbacks. This makes attach O(n). ugdb does this. Oleg.