On Mon, 24 Feb 2014 12:44:33 -0800, Matt Davis said: > Are there any memory efficiencies with how the kernel loads the .data > vs the .rodata sections into memory? Will the information stored in > .rodata have better cache performance than that stored in .data?
Yes/no/maybe. It's mostly going to depend on whether there's any *other* hot data in the same cache line. There's been a number of patches that re-organize various structs that are larger than a cache line so that all the hot data is in the same line. There's also been patches to *split* data across 2 cache lines to avoid ping-ponging (where CPU 1 is beating up on variable A, and CPU 2 is beating up on not-very-related variable B, and they just keep shooting down the cache line).
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