David S. Miller writes: > That first cache line of current_thread_info() should be so hot that > it's probably just fine to use current_thread_info()->task since > you're just doing a mask on a fixed register (r1) to implement that.
I tried that, but I found that adding 1 instruction to the sequence for getting current adds about 8k to the kernel text. Currently we do it in one instruction, that would be two - the mask and the load. It probably doesn't make a measurable difference to performance, but it doesn't look good. The number of instructions we lose by using __thread is much less than the 8k we gain from using current_thread_info()->task for current. So I'd prefer to use a per-cpu variable for current, since we can get to that in 1 instruction. Paul. - To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
