This patch series contains 2 performance optimizations that target PPC64, although the first one also benefits other archs.
In the first optimization, the check for empty breakpoints' queue is moved out of check_for_breakpoints(), into a macro, to avoid the call overhead. In the second optimization, the most frequently executed part of the code that updates the PMCs is translated to inline TCG ops. Also, new HFLAGS are introduced, to keep the inline code small and fast. With both optimizations, a reduction of about 15% in Fedora's boot time was measured on a POWER9 machine. The PMU tests from kernel selftests were run and all tests that pass on master still pass with these changes. Leandro Lupori (3): accel/tcg: Add a quicker check for breakpoints target/ppc: Add new PMC HFLAGS target/ppc: Increment PMC5 with inline insns accel/tcg/cpu-exec.c | 13 +++---- target/ppc/cpu.h | 4 ++- target/ppc/helper.h | 1 + target/ppc/helper_regs.c | 6 ++++ target/ppc/power8-pmu.c | 74 +++++++++++++++++++++------------------- target/ppc/power8-pmu.h | 3 ++ target/ppc/translate.c | 32 +++++++++++++++-- 7 files changed, 87 insertions(+), 46 deletions(-) -- 2.25.1
