linux-kernel - Re: [RFC] [PATCH procfs] Add process age

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Message-Id: <201007240316.30892.sftp.mtuci@gmail.com>
Date:	Sat, 24 Jul 2010 03:16:30 +0400
From:	"Sergey V." <sftp.mtuci@...il.com>
To:	dave.bueso@...il.com
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [RFC] [PATCH procfs] Add process age

On Friday 23 of July 2010 22:47:10 Davidlohr Bueso wrote:
> On Fri, 2010-07-23 at 21:35 +0300, Alexey Dobriyan wrote:
> > On Fri, Jul 23, 2010 at 01:47:51PM -0400, Davidlohr Bueso wrote:
> > > This patch exports a process's age, in seconds, adding a /proc/#/age 
file.
> > 
> > What for?
> 
> I have not found any straight way to get the run time of a processes,
> without having to interpret the start_time entry in /proc/#/stat and
> manually subtract the uptime from it.

Agree. I thing this feature can be useful in some cases.

I have not found better than run something like this:

echo `cat /proc/uptime | awk '{print $1}'` - \
     `cat /proc/$PID/stat | awk '{print $22}'`/100 | bc

> This small file simply aids the users to obtain the information easier
> and quicker. Another alternative would be to add an entry
> in /proc/#/status.
> 
> Davidlohr
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