linux-kernel - Re: clock_gettime

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Message-ID: <52279D17.2010607@linaro.org>
Date:	Wed, 04 Sep 2013 13:50:31 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Arun Sharma <asharma@...com>, LKML <linux-kernel@...r.kernel.org>,
	Kumar Sundararajan <kumar@...com>,
	Richard Cochran <richardcochran@...il.com>
Subject: Re: clock_gettime_ns

On 09/04/2013 01:23 PM, Andy Lutomirski wrote:
> On Wed, Sep 4, 2013 at 12:17 PM, John Stultz <john.stultz@...aro.org> wrote:
>> On Wed, Sep 4, 2013 at 2:18 AM, Arun Sharma <asharma@...com> 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

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