Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760101Ab3IDUYR (ORCPT ); Wed, 4 Sep 2013 16:24:17 -0400 Received: from mail-lb0-f169.google.com ([209.85.217.169]:57247 "EHLO mail-lb0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753097Ab3IDUYQ (ORCPT ); Wed, 4 Sep 2013 16:24:16 -0400 MIME-Version: 1.0 In-Reply-To: References: <5226FAE1.5070201@fb.com> From: Andy Lutomirski Date: Wed, 4 Sep 2013 13:23:54 -0700 Message-ID: Subject: Re: clock_gettime_ns To: John Stultz Cc: Arun Sharma , LKML , Kumar Sundararajan , Richard Cochran 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: 1528 Lines: 35 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. --Andy -- 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/