Yes precisely the same what I see.. Thanks, Onkar
On Wed, Apr 7, 2010 at 9:16 PM, Mulyadi Santosa <mulyadi.sant...@gmail.com>wrote: > Hi Onkar.... > > On Wed, Apr 7, 2010 at 17:56, Onkar Mahajan <kern.de...@gmail.com> wrote: > > static struct hlist_head *inode_hashtable __read_mostly; > > > > > > what is the use of __read_mostly ? > > > > I did not find any detailed documentation for this > > on GCC website , Is it GCC optimization feature ? > > I failed to search the definition in kernel source or gcc docs. > However, I am pretty confidence that this is somekind of definition to > mark the related variable/structure/whatever and put them into the > same memory segment. > > By doing so, the programmers are hoping that these data are grouped > into the same cache line. And since they are mostly read only, cache > won't be invalidated too much (maybe zero in some cases) if there is > update into that cache line. > > Does this clear your doubt? > > -- > regards, > > Mulyadi Santosa > Freelance Linux trainer and consultant > > blog: the-hydra.blogspot.com > training: mulyaditraining.blogspot.com >
