+ Julien Hi Lecopzer,
On Sat, 16 May 2020 at 18:20, Lecopzer Chen <lecop...@gmail.com> wrote: > > 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. > This is something that is already implemented via Julien's patch-set [1]. Its v4 has been floating since July, 2019 and I couldn't find any major blocking comments but not sure why things haven't progressed further. Maybe Julien or Arm maintainers can provide updates on existing patch-set [1] and how we should proceed further with this interesting feature. And regarding hard-lockup detection, I have been able to enable it based on perf NMI events using Julien's perf patch-set [1]. Have a look at the patch here [2]. [1] https://patchwork.kernel.org/cover/11047407/ [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2020-May/732227.html -Sumit > 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 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-ker...@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
