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clinuxmemory-managementinstrumentationintel-pin

Force memory allocation always to the same virtual address

I'm experimenting with Pin, an instrumentation tool, which I use to compute some statistics based on memory address of my variables. I want to re-run my program with the information gathered by my instrumentation tool, but for that it's crucial that virtual memory addresses remain the same through different runs.

In general, I should let the OS handle memory allocation, but in this case I need some kind of way to force it to always allocate to the same virtual address. In particular, I'm interested in a very long array, which I'm currently allocating with numa_alloc_onnode(), though I could use something else.

What would be the correct way to proceed?

Thanks

Solution

  • You could try mmap(2).

    The instrumented version of your program will use a different memory layout than the original program because pin needs memory for the dynamic translation etc. and will change the memory layout. (if I recall correctly)