Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932304AbXBWMoK (ORCPT ); Fri, 23 Feb 2007 07:44:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932309AbXBWMoK (ORCPT ); Fri, 23 Feb 2007 07:44:10 -0500 Received: from relay.2ka.mipt.ru ([194.85.82.65]:53066 "EHLO 2ka.mipt.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932304AbXBWMoI (ORCPT ); Fri, 23 Feb 2007 07:44:08 -0500 Date: Fri, 23 Feb 2007 15:41:23 +0300 From: Evgeniy Polyakov To: Ingo Molnar Cc: Ulrich Drepper , linux-kernel@vger.kernel.org, Linus Torvalds , Arjan van de Ven , Christoph Hellwig , Andrew Morton , Alan Cox , Zach Brown , "David S. Miller" , Suparna Bhattacharya , Davide Libenzi , Jens Axboe , Thomas Gleixner Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3 Message-ID: <20070223124123.GA24749@2ka.mipt.ru> References: <20070221211355.GA7302@elte.hu> <20070221233111.GB5895@elte.hu> <45DCD9E5.2010106@redhat.com> <20070222074044.GA4158@elte.hu> <20070222113148.GA3781@2ka.mipt.ru> <20070222125931.GB25788@elte.hu> <20070222133201.GB5208@2ka.mipt.ru> <20070223115152.GA2565@elte.hu> <20070223122224.GB5392@2ka.mipt.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=koi8-r Content-Disposition: inline In-Reply-To: <20070223122224.GB5392@2ka.mipt.ru> User-Agent: Mutt/1.5.9i X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0 (2ka.mipt.ru [0.0.0.0]); Fri, 23 Feb 2007 15:42:14 +0300 (MSK) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1165 Lines: 23 On Fri, Feb 23, 2007 at 03:22:25PM +0300, Evgeniy Polyakov (johnpol@2ka.mipt.ru) wrote: > I meant that we end up with having one thread per IO - they were > preallocated, but that does not matter. And what about your idea of > switching userspace threads to cachemiss threads? > > My main concern was only about the situation, when we ends up with truly > bloking context (like network), and this results in having thousands of > threads doing the work - even having most of them sleeping, there is a > problem with memory overhead and context switching, although it is usable > situation, but when all of them are ready immediately - context switching simultaneously > will kill a machine even with O(1) scheduler which made situation damn > better than before, but it is not a cure for the problem. Week of no-dictionary writings starts beating me. -- Evgeniy Polyakov - 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/