On Thu 2019-04-04 15:18:55, Josh Poimboeuf wrote: > On Thu, Apr 04, 2019 at 08:44:11PM +0200, Miroslav Benes wrote: > > GCC 9 introduces a new option, -flive-patching. It disables certain > > optimizations which could make a compilation unsafe for later live > > patching of the running kernel. > > > > The option is used only if CONFIG_LIVEPATCH is enabled and $(CC) > > supports it. > > > > Performance impact of the option was measured on three different > > Intel machines - two bigger NUMA boxes and one smaller UMA box. Kernel > > intensive (IO, scheduling, networking) benchmarks were selected, plus a > > set of HPC workloads from NAS Parallel Benchmark. The tests were done on > > upstream kernel 5.0-rc8 with openSUSE Leap 15.0 userspace. > > > > The majority of the tests is unaffected. The only significant exception > > is the scheduler section which suffers 1-3% degradation. > > > > Evaluated-by: Giovanni Gherdovich <ggherdovich@xxxxxxx> > > Signed-off-by: Miroslav Benes <mbenes@xxxxxxx> > > --- > > The patch is based on master branch of the livepatching tree on > > git.kernel.org. > > > > Many thanks to Giovanni who ran the whole testing campaign and analyzed > > the results. I archived the dashboard and detailed data. If anyone is > > interested, we could probably set up a public website somewhere. > > Acked-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> I have committed the patch into the branch for-5.2/core. Best Regards, Petr
