linux-kernel - Re: Measuring startup-time from userspace

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Message-ID: <oe28v7-g0t.ln1@chipmunk.wormnet.eu>
Date:	Mon, 3 Jan 2011 05:12:24 +0000
From:	Alexander Clouter <alex@...riz.org.uk>
To:	linux-kernel@...r.kernel.org
Subject: Re: Measuring startup-time from userspace

Taras Glek <tglek@...illa.com> wrote:
>
> Does Linux provide a reasonable way to measure how long a process has 
> existed for? The goal is to have a function that returns the number of 
> milliseconds since process-creation.
>
At a glance:
----
alex@...k:~$ stat /proc/16863/
  File: `/proc/16863/'
  Size: 0               Blocks: 0          IO Block: 1024   directory
Device: 3h/3d   Inode: 837808      Links: 6
Access: (0555/dr-xr-xr-x)  Uid: ( 1000/    alex)   Gid: ( 1000/    alex)
Access: 2011-01-03 05:07:47.888363341 +0000
Modify: 2011-01-03 05:07:47.888363341 +0000
Change: 2011-01-03 05:07:47.888363341 +0000
----

A nanosecond resolution timestamp for the moment when the pid is created 
it seems.  I could be completely wrong, but this seems to be one of 
those "too easy to be true" moments.

Cheers

-- 
Alexander Clouter
.sigmonster says: Marriage is the sole cause of divorce.

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