Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761131Ab3IDUuf (ORCPT ); Wed, 4 Sep 2013 16:50:35 -0400 Received: from mail-pb0-f43.google.com ([209.85.160.43]:37799 "EHLO mail-pb0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756913Ab3IDUue (ORCPT ); Wed, 4 Sep 2013 16:50:34 -0400 Message-ID: <52279D17.2010607@linaro.org> Date: Wed, 04 Sep 2013 13:50:31 -0700 From: John Stultz User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130803 Thunderbird/17.0.8 MIME-Version: 1.0 To: Andy Lutomirski CC: Arun Sharma , LKML , Kumar Sundararajan , Richard Cochran Subject: Re: clock_gettime_ns References: <5226FAE1.5070201@fb.com> In-Reply-To: X-Enigmail-Version: 1.5.2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1606 Lines: 35 On 09/04/2013 01:23 PM, Andy Lutomirski wrote: > On Wed, Sep 4, 2013 at 12:17 PM, John Stultz wrote: >> On Wed, Sep 4, 2013 at 2:18 AM, Arun Sharma wrote: >>> A couple of years ago Andy posted this patch series: >>> >>> http://thread.gmane.org/gmane.linux.kernel/1233209/ >>> >>> These patches have been in use at facebook for a couple of years and along >>> with a vDSO implementation of thread_cpu_time(), they have proven useful for >>> our profilers. >>> >>> I didn't see any arguments against this patch series. Did I miss some >>> discussion on the topic? >> (I've got a new email address, just fyi) >> >> So, looking at the thread, I think Richard brought up the issue that >> the net performance gain with the new interface wasn't significant >> after the optimizations were applied to both interfaces. >> >> If we're going to add a new interface that uses something other then a >> timespec, we likely need to put some serious thought into that new >> type, and see how it could be used across a number of syscalls. Some >> of the discussion around dealing with the 2038 issue touched on this. >> >> But getting those optimizations to the existing interface merged would >> be nice, though. Anyone want to resend the patch? > It's already in. See 5f293474c4c6c4dc2baaf2dfd486748b5986de76, etc. Great! -john -- 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/