On Sat, Oct 1, 2011 at 3:39 PM, Jayachandran C. <jayachandranc@xxxxxxxxxxxxxxxxx> wrote: > On Sat, Oct 01, 2011 at 01:19:53PM +0800, Hillf Danton wrote: >> TLB miss is one of the concerned factors when tuning the performance of user >> applications, and there are on netlogic XLR chip eight 64-bit registers, >> c0 register 22 select 0-7, which could be used as temporary storage. >> >> One of them is used for counting TLB refill, and any comment is appreciated. >> > > Few comments: > > Adding this unconditionally will add overhead to the TLB refill handler, this > should be probably controlled by a boot-time variable, or with some > perf/profile framework. > Boot-time variable will be added. > If you have access to our SDK, it uses register 22,2 for counting TLB misses > it would be good to retain that compability, otherwise it will mess up when > we merge this back to our internal code. > It is clear for all users if the usage of reg 22 is defined in , say, mips-extns.h? > The reporting part currently will only print the misses on a crash (if I am > not mistaken), again this has to be tied in with some standard framework. > How about one line added in /proc/interrupts? Thanks Hillf
