Re: question about /proc/kcore

["Gayathri Swaminathan" <gayathri.swa@xxxxxxxxx>]

Think Jamie is right.

I have observed behaviour were this file grows based on accessed memory (would this be kernel shared mem params?)

But it is definitely not just size of physical RAM+4KB on a machine.

gayathri

On Sat, Aug 2, 2008 at 3:54 PM, Astarta <astarta@xxxxxx> wrote:

Jamie Levy wrote:

Hello,

I know this list has been rather quiet for a while...  so I might as
well ask a question :-)

Hello,

I really thought that this list is completely dead :-)

This does not seem to be the case, however, when I do a listing in
/proc/kcore on my machine (F8) which has 2 GB of memory:

ls -lh /proc/kcore
-r-------- 1 root root 897M 2008-08-01 19:05 /proc/kcore

I have confirmed the same type of results on other machines to which I
have access.  I also do not seem to have the kcore.h file on my system
(and I have kernel-devel installed), since it is a zero byte file:

-rw-r--r-- 1 root root 0 2008-07-21 02:05
/usr/src/kernels/2.6.25.11-60.fc8-i686/include/config/proc/kcore.h

As far as I know, the size of kcore is equal not to the size of _all_ physical memory installed on the machine, but just to the amount of memory accessible by kernel.
Your kernel seems to be compiled with HIGHMEM support, and if you do `ls -l /proc/kcore` you see your LOWMEM size, the real memory that the kernel uses. That the reason why the difference you mentioned comes.

Someone will correct me, if I'm wrong :)

All the best,

-Jamie Levy

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with best regards,
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