title: Can memory from /dev/shm be cached in the CPU cache?
body: <p>When memory is frequently accessed, it's put onto the CPU cache (L1, L2, L3). However, is the same true of memory that is mmap'd to a file living in /dev/shm? I ask because I wanted to know if having it backed to a file in /dev/shm would bypass any kind of caching by the CPU, and rather letting it fall through to a cache miss.</p>