From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: Re: [Lsf-pc] [LSF/MM TOPIC] async buffered diskio read for userspace apps Date: Tue, 20 Jan 2015 16:26:46 -0700 Message-ID: <54BEE436.4020205@kernel.dk> References: <20150115223157.GB25884@quack.suse.cz> <20150116165506.GA10856@samba2> <20150119071218.GA9747@jeremy-HP> <1421652849.2080.20.camel@HansenPartnership.com> <54BD234F.3060203@kernel.dk> <54BEAD82.3070501@kernel.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Cc: James Bottomley , Jeremy Allison , Volker Lendecke , Jan Kara , Christoph Hellwig , linux-mm@kvack.org, "linux-fsdevel@vger.kernel.org" , lsf-pc@lists.linux-foundation.org To: Milosz Tanski Return-path: Received: from mail-pd0-f179.google.com ([209.85.192.179]:42242 "EHLO mail-pd0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751841AbbATX0b (ORCPT ); Tue, 20 Jan 2015 18:26:31 -0500 Received: by mail-pd0-f179.google.com with SMTP id v10so27699471pde.10 for ; Tue, 20 Jan 2015 15:26:31 -0800 (PST) In-Reply-To: Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On 01/20/2015 04:22 PM, Milosz Tanski wrote: > Side note Jens. > > Can you add a configure flag to disable use of SHM (like for ESX)? It > took me a while to figure out the proper define to manually stick in > the configure. > > The motivation for this is using rr (mozila's replay debugger) to > debug fio. rr doesn't support SHM. http://rr-project.org/ gdb's > reversible debugging is too painfully slow. Yeah definitely, that's mean that thread=1 would be a requirement, obviously. But I'd be fine with adding that flag. -- Jens Axboe From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f182.google.com (mail-pd0-f182.google.com [209.85.192.182]) by kanga.kvack.org (Postfix) with ESMTP id BF5326B0070 for ; Tue, 20 Jan 2015 18:26:33 -0500 (EST) Received: by mail-pd0-f182.google.com with SMTP id z10so6481044pdj.13 for ; Tue, 20 Jan 2015 15:26:33 -0800 (PST) Received: from mail-pa0-f42.google.com (mail-pa0-f42.google.com. [209.85.220.42]) by mx.google.com with ESMTPS id is2si6068108pbb.146.2015.01.20.15.26.31 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 20 Jan 2015 15:26:31 -0800 (PST) Received: by mail-pa0-f42.google.com with SMTP id et14so48825323pad.1 for ; Tue, 20 Jan 2015 15:26:31 -0800 (PST) Message-ID: <54BEE436.4020205@kernel.dk> Date: Tue, 20 Jan 2015 16:26:46 -0700 From: Jens Axboe MIME-Version: 1.0 Subject: Re: [Lsf-pc] [LSF/MM TOPIC] async buffered diskio read for userspace apps References: <20150115223157.GB25884@quack.suse.cz> <20150116165506.GA10856@samba2> <20150119071218.GA9747@jeremy-HP> <1421652849.2080.20.camel@HansenPartnership.com> <54BD234F.3060203@kernel.dk> <54BEAD82.3070501@kernel.dk> In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Milosz Tanski Cc: James Bottomley , Jeremy Allison , Volker Lendecke , Jan Kara , Christoph Hellwig , linux-mm@kvack.org, "linux-fsdevel@vger.kernel.org" , lsf-pc@lists.linux-foundation.org On 01/20/2015 04:22 PM, Milosz Tanski wrote: > Side note Jens. > > Can you add a configure flag to disable use of SHM (like for ESX)? It > took me a while to figure out the proper define to manually stick in > the configure. > > The motivation for this is using rr (mozila's replay debugger) to > debug fio. rr doesn't support SHM. http://rr-project.org/ gdb's > reversible debugging is too painfully slow. Yeah definitely, that's mean that thread=1 would be a requirement, obviously. But I'd be fine with adding that flag. -- Jens Axboe -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org