Nice to see somebody is pushing this. I am getting fed up wtih
applying these to every 2.4.xx.
Note that with GCC >= 3.x(Not sure about "x", definitely 3.2), the P4
compile option correctly
generates add/sub instructions instead of the "P4 killer" inc/dec.
Of course, in include/asm-i386, we still have incs/decs in
processor.h, atomic.h, rwsem.h, semaphore.h uaccess.h, system.h,
string.h, spinlock.h and smplock.h.
With the patches and changing the includes, I can get a 5-10% improvement
with a hefty DB app on a UP P4 which isn't to be sneezed at.
And perhaps somebody should take a squint at the "copy_xxx_user".
IMHO, this really should be inlined.
Try running a DB app which bounces semaphores at a terrific rate and what
do you see at the top of readprofile ? Yep, you guessed it.
Margit
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