On Wed, Jun 08, 2022 at 09:28:18PM +0200, Sedat Dilek wrote:
> I have pulled this on top of Linux v5.19-rc1... plus assorted patches
> to fix issues with LLVM/Clang version 14.
> No (new) warnings in my build-log.
> Boots fine on bare metal on my Debian/unstable AMD64 system.
>
> Any hints for testing - to see improvements?
Profiling, basically... A somewhat artificial microbenchmark would be
to remove read_null()/write_null()/read_zero()/write_zero(), along with
the corresponding .read and .write initializers in drivers/char/mem.c
and see how dd to/from /dev/zero and friends behaves. On the mainline
it gives a noticable regression, due to overhead in new_sync_{read,write}().
With this series it should get better; pipe reads/writes also should see
reduction of overhead.
There'd been a thread regarding /dev/random stuff; look for
"random: convert to using iters" and things nearby...
