lock some memory pages in cache using C

Question

I am developing a program in C and I want to lock some memory pages in cache, particularly in the core specific level (i.e. level 1). As far as I know the C libraries do not provide an interface to do that so I guess
that there must be some particular directives in gcc to do so. I am interested in locking both a struct and some arbitrary variables.

Could any one provide any information for that? If so it would be very helpful.

Answer 1

__builtin_prefetch() is what you need. However, there's no way you'll be able to lock anything in L1: it'll be evicted very shortly afterwards.