On Wed, Aug 19, 2020 at 09:16:59AM +0200, Christophe Leroy wrote:
> I made a test with only the first patch of your series: That's definitely
> the culprit. With only that patch applies, the duration is 6.64 seconds,
> that's a 25% degradation.
For the record: the first patch is:
mem: remove duplicate ops for /dev/zero and /dev/null
So these micro-optimizations matter at least for some popular
benchmarks. It would be easy to drop, but that means we either:
- can't support kernel_read/write on these files, which should not
matter
or
- have to drop the check for both ops being present
Al, what do you think?
