linux-kernel - RE: Question about free/used memory on Linux

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Date:	Wed, 14 Nov 2007 10:18:24 -0800
From:	"Ravinandan Arakali (rarakali)" <rarakali@...co.com>
To:	Pádraig Brady <P@...igBrady.com>
Cc:	"Vaidyanathan Srinivasan" <svaidy@...ux.vnet.ibm.com>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: RE: Question about free/used memory on Linux

Thanks Padraig.

Any idea how to get the size of running linux kernel ?

Ravi 

-----Original Message-----
From: Pádraig Brady [mailto:P@...igBrady.com] 
Sent: Wednesday, November 14, 2007 3:58 AM
To: Ravinandan Arakali (rarakali)
Cc: Vaidyanathan Srinivasan; Linux Kernel
Subject: Re: Question about free/used memory on Linux

Ravinandan Arakali (rarakali) wrote:
> Hi Vaidy,
> What do you think is the right way to get the memory usage of a 
> process, I mean the actual physical memory used ? Basically, I'm 
> interested in the incremental cost of a process, which means, I don't 
> want to include the text segments of shared libraries which would 
> remain even after the process is killed (since it would be used by 
> other processes).
> 
> Is the RSS field of "ps aux" command the right one or use "pmap" 
> command and look at the "writeable" segments ?

I already commented on this thread with a python script for reporting RAM usage for programs.

RSS = Private and Shared Resident pages.
You can get the shared value for a process from /proc/$$/smaps (as is done in the script)

Pádraig.
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