On Thu, 2007-12-13 at 14:32 -0800, David Miller wrote: > From: Adrian Bunk <bunk@xxxxxxxxxx> > Date: Thu, 13 Dec 2007 23:20:44 +0100 > > > My question is: > > Is there anywhere in the kernel a case where __read_mostly brings a > > measurable improvement or can it be removed? > > Yes, on SMP when read-mostly objects share cache lines > with other objects which are frequently written to. > > That is the whole reason we created __read_mostly I'm curious if anyone has been looking into replacing the __read_mostly approach with Mathieu's immediate values patchset. Wouldn't they solve the cacheline sharing as well (perhaps more eficiently even with trading some icache for dcache)? Harvey - To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
