memory foorprint of kernel modules

memory foorprint of kernel modules

[Gopi Palaniappan]

Is there an easy way to measure the memory/RAM footprint of dynamically
loaded kernel modules?
Are there tools similar to "pmap" for this purpose?

thanks,
Gopi
--
Motorola Inc.
Personal Communications Sector,
Urbana-Champaign Design Center,
1800 S. Oak St, Champaign, IL 61820.

Re: memory foorprint of kernel modules

[Richard B. Johnson]

On Thu, 12 Feb 2004, Gopi Palaniappan wrote:

> Is there an easy way to measure the memory/RAM footprint of dynamically
> loaded kernel modules?
> Are there tools similar to "pmap" for this purpose?
>
> thanks,
> Gopi
> --
> Motorola Inc.
> Personal Communications Sector,
> Urbana-Champaign Design Center,
> 1800 S. Oak St, Champaign, IL 61820.
>

You might make some sense of /proc/ksyms...

This is for a module called ramdisk.

Script started on Thu Feb 12 15:41:10 2004
cd /proc
# strings ksyms | grep ramdisk
[ramdisk]
[ramdisk]
[ramdisk]
[ramdisk]
[ramdisk]
[ramdisk]
[ramdisk]
[ramdisk]
d4a19510 __insmod_ramdisk_S.bss_L4
[ramdisk]
d4a19100 __insmod_ramdisk_S.rodata_L563
[ramdisk]
[ramdisk]
[ramdisk]
d4a18000 __insmod_ramdisk_O/root/Message-Based/drivers/target/ramdisk.o_M4027E0AD_V132120
[ramdisk]
[ramdisk]
[ramdisk]
[ramdisk]
d4a18054 __insmod_ramdisk_S.text_L4237
[ramdisk]
[ramdisk]
[ramdisk]
[ramdisk]
d4a19398 __insmod_ramdisk_S.data_L5
[ramdisk]
# exit
exit
Script done on Thu Feb 12 15:41:45 2004



Cheers,
Dick Johnson
Penguin : Linux version 2.4.24 on an i686 machine (797.90 BogoMips).
            Note 96.31% of all statistics are fiction.

RE: memory foorprint of kernel modules

[Gopi Palaniappan]

Hi Richard:
    I am not sure looking at the ksyms will give me an actual measure.
Lets take an example,
I have a driver "foo.o" that i insmod, lets say. If this driver uses kmalloc
or malloc to dynamically
utilize RAM space for its internal operation, I don't think your suggested
method will capture
that dynamic allocation of memory, am i correct?

  I want to get a real-time ram usage of a specified dynamically loaded
module.

thanks,
Gopi



On Thu, 12 Feb 2004, Gopi Palaniappan wrote:

> Is there an easy way to measure the memory/RAM footprint of dynamically
> loaded kernel modules?
> Are there tools similar to "pmap" for this purpose?
>
>

You might make some sense of /proc/ksyms...

This is for a module called ramdisk.

Script started on Thu Feb 12 15:41:10 2004
cd /proc
# strings ksyms | grep ramdisk
[ramdisk]
[ramdisk]
d4a19510 __insmod_ramdisk_S.bss_L4
[ramdisk]
d4a19100 __insmod_ramdisk_S.rodata_L563
d4a18000
__insmod_ramdisk_O/root/Message-Based/drivers/target/ramdisk.o_M4027E0AD_V13
2120
d4a18054 __insmod_ramdisk_S.text_L4237
d4a19398 __insmod_ramdisk_S.data_L5
[ramdisk]
# exit