hi :
2011/2/18 John Mahoney <[email protected]>: > On Thu, Feb 17, 2011 at 9:17 AM, loody <[email protected]> wrote: >> hi :-) >> >> 2011/2/16 Mulyadi Santosa <[email protected]>: >>> Hi :) >>> >>> On Wed, Feb 16, 2011 at 12:59, Rajat Jain <[email protected]> wrote: >>>> Hello loody, >>>> >>>>> 1. in kernel/trace, I always see "__read_mostly" at the end of >>>>> parameter is that a compiler optimization parameter? >>>> >>>> Yes, it is a hint to the compiler that the parameter is mostly read, thus >>>> if the compiler has to make a decision between optimizing one of the read >>>> / write paths, it will optimize the read path even at the expense of write >>>> path. >>> >>> >>> To be precise, they will be grouped into same cache line as much as >>> possible. By doing so, those cache line won't be invalidated so often >>> (keeping them "hot" :) hehehhe ) >> >> I cannot find it on the gcc manual. >> is it a option in kernel for kernel usage? >> if so, where I can found them. >> If not, can I use it on normal user level program? >> > > It is a macro defined for x86 as: > > #define __read_mostly __attribute__((__section__(".data..read_mostly"))) > > http://lxr.linux.no/linux+v2.6.37/arch/x86/include/asm/cache.h I found where you pointed out but I try to find out where is it in the mips arch. thank you, miloody _______________________________________________ Kernelnewbies mailing list [email protected] http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
