Excerpts from Christophe Leroy's message of February 9, 2021 1:10 am:
This series implements C syscall entry/exit for PPC32. It reuses
the work already done for PPC64.
This series is based on today's merge-test (b6f72fc05389e3fc694bf5a5fa1bbd33f61879e0)
In terms on performance we have the following number of cycles on an
8xx running null_syscall benchmark:
- mainline: 296 cycles
- after patch 4: 283 cycles
- after patch 16: 304 cycles
- after patch 17: 348 cycles
- at the end of the series: 320 cycles
So in summary, we have a degradation of performance of 8% on null_syscall.
I think it is not a big degradation, it is worth it.
I guess it's 13% from 283. But it's very nice to use the shared C code.
There might be a few more percent speedup in there we can find later.
Thanks,
Nick