On Fri, 1 May 2009, Sam Ravnborg wrote: > Are there any specific reason why we do not support read_mostly on all > architectures? Not that I know of. > read_mostly is about grouping rarely written data together > so what is needed is to introduce this section in the remaining > archtectures. > > Christoph - git log says you did the inital implmentation. > Do you agree? Yes. There is some concern that __read_mostly is needlessly applied to numerous variables that are not used in hot code paths. This may make __read_mostly ineffective and actually increase the cache footprint of a function since global variables are no longer in the same cacheline. If such a function is called and the caches are cold then two cacheline fetches have to be done instead of one.
