On Fri, Apr 28, 2006 at 01:04:17PM +0000, moreau francis wrote:
> Maybe a silly question...why do we use mapped memory (allocated by
> vmalloc) for inserting a module into the kernel ?
>
Ok, to sum up things:
Pros:
- allocation granularity is a page size where as GFP allocations is a power
of two...
- better chance for the module to get loaded into fragmented memory.
Cons:
- it consumes TLB entries, (usually one ?)
- it needs to generate the module with "-mlong-calls" switch which generates
larger and less efficient code.
- there will be a refill exception overhead each time the module code will be
executed and it's not mapped through TLB.
maybe that would make sense to do some benchmarks ?
Thanks
