Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754438AbZIWHoh (ORCPT ); Wed, 23 Sep 2009 03:44:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754302AbZIWHoh (ORCPT ); Wed, 23 Sep 2009 03:44:37 -0400 Received: from fg-out-1718.google.com ([72.14.220.157]:12675 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754065AbZIWHog (ORCPT ); Wed, 23 Sep 2009 03:44:36 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=wAmeHVL+5yiywkYbjreZyJWF4KXXrl5Vr1wijuqxE0ybOy5jtWDbfJ2vOdglyhvTs6 uRXbJJAl1D9h5rSe/i+iy0e+sFm97eBlC4KJ9+q1uEnKZ+hMvB5gNiw6NSxi4K13HJEN +mK6QQWCv+lNmF4KGyir34hvrn1qCwac3FU2g= MIME-Version: 1.0 In-Reply-To: <20090923074028.GA3078@elte.hu> References: <7863dc4c0909221409v7893bfd3o4b590d5951a233ba@mail.gmail.com> <20090922212453.GB6062@nowhere> <1253686585.7695.84.camel@twins> <20090923073253.GA18022@elte.hu> <20090923074028.GA3078@elte.hu> Date: Wed, 23 Sep 2009 11:44:39 +0400 Message-ID: Subject: Re: perf sched record hangs machine From: Cyrill Gorcunov To: Ingo Molnar Cc: Peter Zijlstra , Frederic Weisbecker , Chris Malley , linux-kernel@vger.kernel.org, Steven Rostedt Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1520 Lines: 49 On 9/23/09, Ingo Molnar wrote: > > * Ingo Molnar wrote: > >> >> * Peter Zijlstra wrote: >> >> > .size default_send_IPI_self, .-default_send_IPI_self >> > >> > Which seems to suggest that cmove is in __prepare_ICR, but I'm not >> > sure how that can cause a page-fault, as that function is rather >> > pointer-less. >> > >> > Did it maybe delay evaluating apic->dest_logical that late, it appear >> > to be the first usage of that argument? >> > >> > Ingo, any ideas? >> >> Yeah, the problem is: >> >> [ 0.042445] Local APIC not detected. Using dummy APIC emulation. >> >> we shouldnt be trying to program the lapic in that case - all ops >> should be a NOP, including send-ipi-self. Cyrill? > > Cyrill, the right fix would be to define a: > > struct apic apic_none; > > with dummy functions injected. Set struct apic *apic to _that_, instead > of apic_default. > > This means that if we manage to detect a local APIC, we will set it to > apic_default (or some other driver) - but the bootup default will be 'no > APIC'. > May it wait till evening (i'll back from office and take a look)? > This is a lot cleaner and a lot less error-prone than the direct > frobbing of the function pointers. > > Ingo > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/