Le 28/08/2019 à 11:49, Nicholas Piggin a écrit :
Christophe Leroy's on August 28, 2019 7:06 pm:
Le 27/08/2019 à 15:55, Nicholas Piggin a écrit :
Accounted for some feedback.
Nicholas Piggin (4):
powerpc: convert to copy_thread_tls
powerpc/64: remove support for kernel-mode syscalls
powerpc/64: system call remove non-volatile GPR save optimisation
powerpc/64: system call implement the bulk of the logic in C
Would it be possible to split in the following parts:
1/ Implement in C whatever can be implemented without removing
non-volatile GPR save optimisation
2/ Remove non-volatile GPR save optimisation
3/ Implement in C everything else
Hmm. I'll have a look but I would rather not go back and add the
intermediate state I was hoping to avoid. I'll think about it and
if it's not too difficult I will try to add something. I have an
idea.
With your nvregs performance test on ppc32, are you doing the
nvgpr restore? The fast path should be able to avoid that.
I only added the SAVE_NVGPRS call in the syscall entry macro just after
the saving of volatile regs, and changed the trap from \trapno+1 to \trapno
Christophe
