On Mon, 17 Oct 2022 12:18:27 +0200 Nico Boehr <nrb@xxxxxxxxxxxxx> wrote: thanks, picked > v6->v7: > --- > * change info message to indicate normalization and number of iterations > normalized to (thanks Claudio) > > v5->v6: > --- > * multiply first, then divide when normalizing (thanks Claudio) > * print fractions of us (thanks Claudio) > * remove non-normalized output (thanks Claudio) > * fence dag9c since not supported under TCG > > v4->v5: > --- > * print normalized runtime to be able to compare runtime of > instructions in a single run (thanks Claudio) > > v3->v4: > --- > * remove merge conflict markers (thanks Christian) > > v2->v3: > --- > * print average (thanks Claudio) > * have asm constraints look the same everywhere (thanks Claudio) > * rebase patchset on top of my migration sck patches[1] to make use of the > time.h improvements > > v1->v2: > --- > * add missing cc clobber, fix constraints for get_clock_us() (thanks > Thomas) > * avoid array and use pointer to const char* (thanks Thomas) > * add comment why testing nop makes sense (thanks Thomas) > * rework constraints and clobbers (thanks Thomas) > > Sometimes, it is useful to measure the exit time of certain instructions > to e.g. identify performance regressions in instructions emulated by the > hypervisor. > > This series adds a test which executes some instructions and measures > their execution time. Since their execution time depends a lot on the > environment at hand, all tests are reported as PASS currently. > > The point of this series is not so much the instructions which have been > chosen here (but your ideas are welcome), but rather the general > question whether it makes sense to have a test like this in > kvm-unit-tests. > > This series is based on my migration sck patches[1] to make use of the > time.h improvements there. > > [1] https://lore.kernel.org/all/20221011170024.972135-1-nrb@xxxxxxxxxxxxx/ > > Nico Boehr (1): > s390x: add exittime tests > > s390x/Makefile | 1 + > s390x/exittime.c | 296 ++++++++++++++++++++++++++++++++++++++++++++ > s390x/unittests.cfg | 4 + > 3 files changed, 301 insertions(+) > create mode 100644 s390x/exittime.c >
