Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751156AbVKNPm2 (ORCPT ); Mon, 14 Nov 2005 10:42:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751157AbVKNPm2 (ORCPT ); Mon, 14 Nov 2005 10:42:28 -0500 Received: from smtp.osdl.org ([65.172.181.4]:27043 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S1751156AbVKNPm1 (ORCPT ); Mon, 14 Nov 2005 10:42:27 -0500 Date: Mon, 14 Nov 2005 07:42:22 -0800 (PST) From: Linus Torvalds To: Andrew Morton cc: Pozsar Balazs , linux-kernel@vger.kernel.org Subject: Re: start_kernel / local_irq_enable() can be very slow In-Reply-To: <20051113234451.73f2527b.akpm@osdl.org> Message-ID: References: <20051112155453.GC21291@ojjektum.uhulinux.hu> <20051113234451.73f2527b.akpm@osdl.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 763 Lines: 31 On Sun, 13 Nov 2005, Andrew Morton wrote: > > You could do something like: > > int trace_irqs; > > trace_irqs = 1; > local_irq_enble(); > trace_irqs = 0; Do "trace_irqs = 10" first. > then, over in handle_IRQ_event(): > > if (trace_irqs) > print_symbol("calling %s\n", (unsigned long)action->handler); And decrement it here somewhere. If it's delayed by up to three seconds, it sounds like there's a _lot_ of interrupts happening, and I don't think there's any point in showing all of them. Linus - 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/