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. ------------------------------------------------------------------------------ Register Now & Save for Velocity, the Web Performance & Operations Conference from O'Reilly Media. Velocity features a full day of expert-led, hands-on workshops and two days of sessions from industry leaders in dedicated Performance & Operations tracks. Use code vel09scf and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf _______________________________________________ User-mode-linux-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
