Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760348Ab3IDTRy (ORCPT ); Wed, 4 Sep 2013 15:17:54 -0400 Received: from mail-ie0-f177.google.com ([209.85.223.177]:61969 "EHLO mail-ie0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752752Ab3IDTRx (ORCPT ); Wed, 4 Sep 2013 15:17:53 -0400 MIME-Version: 1.0 In-Reply-To: <5226FAE1.5070201@fb.com> References: <5226FAE1.5070201@fb.com> Date: Wed, 4 Sep 2013 12:17:52 -0700 X-Google-Sender-Auth: 9LTdoBd33CoRVUiDwZ58buYQTUQ Message-ID: Subject: Re: clock_gettime_ns From: John Stultz To: Arun Sharma Cc: LKML , Andy Lutomirski , 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: 1351 Lines: 33 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? thanks -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/