linux-kernel - Re: Help about calculating total memory consumption during booting

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Date:	Mon, 30 Dec 2013 17:54:15 -0800 (PST)
From:	PINTU KUMAR <pintu_agarwal@...oo.com>
To:	Stefan Beller <stefanbeller@...glemail.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mgorman@...e.de" <mgorman@...e.de>
Subject: Re: Help about calculating total memory consumption during booting






>________________________________
> From: Stefan Beller <stefanbeller@...glemail.com>
>To: PINTU KUMAR <pintu_agarwal@...oo.com>; "linux-mm@...ck.org" <linux-mm@...ck.org>; "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>; "mgorman@...e.de" <mgorman@...e.de> 
>Sent: Monday, 30 December 2013 1:55 AM
>Subject: Re: Help about calculating total memory consumption during booting
> 
>
>On 29.12.2013 19:17, PINTU KUMAR wrote:
>> Hi,
>> 
>> I need help in roughly calculating the total memory consumption in an embedded Linux system just after booting is finished.
>> I know, I can see the memory stats using "free" and "/proc/meminfo"
>> 
>> But, I need the breakup of "Used" memory during bootup, for both kernel space and user application.
>> 
>> Example, on my ARM machine with 128MB RAM, the free memory reported is roughly:
>> Total: 90MB
>> Used: 88MB
>> Free: 2MB
>> Buffer+Cached: (5+19)MB
>> 
>> Now, my question is, how to find the breakup of this "Used" memory of "88MB".
>> This should include both kernel space allocation and user application allocation(including daemons).
>> 
>
>http://www.linuxatemyram.com/ dont panic ;)
>
>How about htop, top or
>"valgrind --tool massif"
>
>



Thanks for the reply, I know about top, but top does not help much in arriving at the total memory consumption.


I need the physical memory usage breakup of each process during bootup, with a segregate of user and kernel allocation.

1) If I add up all "Pss" field in "proc/<PID>/smaps, do I get the total Used memory?
2) Is the Pss value includes the kernel side allocation as well?
3) What fields I should choose from /proc/meminfo" to correctly arrive at the "Used" memory in the system?
4) What about the memory allocation for kernel threads during booting? Why does its Pss/Rss value shows 0 always

I already tried adding up all "PSS" values in every PIDs, but still it does not match any where near to the total used memory in the system.

Please help.
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