11 Apr
2023
11 Apr
'23
2:25 a.m.
On Tue, Apr 11, 2023 at 09:25:16AM +0800, kernel test robot wrote:
kernel test robot noticed a -8.5% regression of stress-ng.mmapaddr.ops_per_sec on:
Assuming this is the test in question:
https://github.com/ColinIanKing/stress-ng/blob/master/stress-mmapaddr.c
then yes, this is expected. The test calls mmap() and munmap() a lot, and we've made those slower in order to fix a bug.
While it does take pagefaults (which is a better test than some microbenchmarks), it only takes one pagefault per call to mmap() and munmap(), which is not representative of real workloads.
Thanks for running the test.