Hello all,

I wish to carry out a memory requirement analysis of two file systems (ext4 and yaffs) and then compare it . In my environment they are built-in the kernel and cannot be compiled as module and hence I can't compare their size by lsmod, or any of the /proc interface. I wish to analyse their static and dynamic memory requirements in idle state and during high I/O traffic.

For Static memory, if any tool or kernel interface can provide me 'kernel mermory map' in terms of memory usage by each built-in module then it may solve my problem. Does any one know ?

For dynamic memory, I wish to run iozone or bonnie or any other file system tool in parellel to produce the I/O traffic and then wish to measure the memory usage pattern, draw a graph and then compare. As per my understanding,

Dynamic memory usage = slab memory + kmalloc

But, I don't know how to find consolidated usage e.g. I tried to use slabtop but it doesn't give any info of kmalloc. Also slabtop doesn't show any info of yaffs.

If anyone can suggest me any better idea or point out any mistake I am making then he/she is is welcome.

- Nitin

If the module is built-in, it will be a part of kernel image.

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Yes, I know. But thats what my question is.
suppose ext4 is built-in and I want know its memory usage then is there any way ?

For example we have 'pmap' command to display the memory map of the process. In the same
way, do we have any utility which can display similar information along with the memory usage info.

The slabtop can display some memory usage in kernel cache if kernel request it.

Examine the linker map from when the kernel image was built. These are addresses of key entry-points within the module which will give you a suggestion of its size. However, I frankly doubt that such a metric will prove to be very useful...