In message: [PATCH v5.15 0/1] aufs: remove overhead for typically disabled Yocto use case on 26/03/2022 Paul Gortmaker wrote:
> After having looked at the AUFS stuff some for the Yocto uprev, what I > wanted to look at a bit more was the raw patches, like the aufs5-mmap.patch > which touches existing core kernel files like mmap.c and fork.c etc. > > It is worth noting that the Yocto use case is quite different from the > typical RYO user who goes out and sources AUFS for themselves. In the > Yocto use case, we have probably 99% of our users who implicitly have > AUFS code present but disabled via Kconfig. In the RYO case the code > is rarely ever disabled since it was intentionally put there to be used. > > For those of us who used preempt-rt patches from over a decade ago, we > can remember instances where the present-and-enabled case got all the > testing and use, and the present-but-disabled case might not even build. > > That means we should be paying extra attention to ensure the present but > disabled case isn't leaving us open to regressions, or any size or > performance burdens vs. the unpatched case with no AUFS code present. > > To that end, I noticed overhead in AUFS that would remain even when > disabled that could be relatively easily avoided and I fix that here. > > Boot testing included AUFS disabled, =y and =m (plus insmod) cases, on > the yocto v5.15.30 baseline with the previous AUFS update applied. > > The two changes made here for the non-MMU case are untested but hopefully > "obviously" correct as parallels to the tested MMU instances. merged. Bruce > > Paul. > --- > > Paul Gortmaker (1): > aufs: reduce overhead for "code present but disabled" use case. > > include/linux/mm.h | 15 +++++++++++++++ > include/linux/mm_types.h | 4 ++++ > mm/Makefile | 3 ++- > mm/mmap.c | 12 +++++++++++- > 4 files changed, 32 insertions(+), 2 deletions(-) > > -- > 2.17.1 >
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