On Tue, Jun 01, 2010 at 05:05:20PM +1000, Benjamin Herrenschmidt wrote: > On Tue, 2010-06-01 at 14:45 +1000, Anton Blanchard wrote: > > Now we dynamically allocate the paca array, it takes an extra load > > whenever we want to access another cpu's paca. One place we do that a lot > > is per cpu variables. A simple example: > > Can't we dedicate a GPR instead ? Or it isn't worth it ? Something we > almost never use in the kernel like r12 ?
Not r12. It is used in function prologue and epilogue code. If you want a dedicated gpr I think you'll need to use (and lose) one of the non-volatile regs. -- Alan Modra Australia Development Lab, IBM _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
