These series implement Perf NMI funxtionality and depends on Pseudo NMI [1] which has been upstreamed.
In arm64 with GICv3, Pseudo NMI was implemented for NMI-like interruts. That can be extended to Perf NMI which is the prerequisite for hard-lockup detector which had already a standard interface inside Linux. Thus the first step we need to implement perf NMI interface and make sure it works fine. Perf NMI has been test by dd if=/dev/urandom of=/dev/null like the link [2] did. [1] https://lkml.org/lkml/2019/1/31/535 [2] https://www.linaro.org/blog/debugging-arm-kernels-using-nmifiq Lecopzer Chen (3): arm_pmu: Add support for perf NMI interrupts registration arm64: perf: Support NMI context for perf event ISR arm64: Kconfig: Add support for the Perf NMI arch/arm64/Kconfig | 10 +++++++ arch/arm64/kernel/perf_event.c | 36 ++++++++++++++++++------ drivers/perf/arm_pmu.c | 51 ++++++++++++++++++++++++++++++---- include/linux/perf/arm_pmu.h | 6 ++++ 4 files changed, 88 insertions(+), 15 deletions(-) -- 2.25.1
