I started this patch by fixing a performance problem with the GHES NMI handler and then things evolved to more patches as I was poking around in the code.
The main focus was moving the GHES NMI driver to its own NMI subtype to avoid slowing down perf handling. Then I decided to move the default external NMI handler to its own routine. Then finally, I needed to see which NMI handlers were registered so I hacked up /proc/interrupts to show me. Tested mostly on HP boxes that have GHES enabled and having the iLO send NMIs to panic the box (using hpwdt driver). Ran perf on other GHES enabled boxes to test performance results. Note: I haven't been able to reproduce Jiri's perf hang yet, so I don't have a patch for that particular problem yet. V3: added patch to get cacheline size at runtime updated some changelogs fix a test failure (after install libunwind-devel) fix header column length V2: adding irq_work items to handled possible lost NMIs (new patch 1) modified output of /proc/interrupts based on feedback (patch 6) Don Zickus (5): x86, nmi: Add new nmi type 'external' x86, nmi: Add boot line option 'panic_on_unrecovered_nmi' and 'panic_on_io_nmi' x86, nmi: Remove 'reason' value from unknown nmi output x86, nmi: Move default external NMI handler to its own routine x86, nmi: Add better NMI stats to /proc/interrupts and show handlers Documentation/kernel-parameters.txt | 9 ++ arch/x86/include/asm/nmi.h | 5 + arch/x86/kernel/irq.c | 3 + arch/x86/kernel/nmi.c | 199 ++++++++++++++++++++++++++-------- drivers/acpi/apei/ghes.c | 4 +- drivers/watchdog/hpwdt.c | 24 +++-- 6 files changed, 187 insertions(+), 57 deletions(-) *** BLURB HERE *** Don Zickus (6): x86, nmi: Implement delayed irq_work mechanism to handle lost NMIs x86, nmi: Add new nmi type 'external' x86, nmi: Add boot line option 'panic_on_unrecovered_nmi' and 'panic_on_io_nmi' x86, nmi: Remove 'reason' value from unknown nmi output x86, nmi: Move default external NMI handler to its own routine x86, nmi: Add better NMI stats to /proc/interrupts and show handlers Documentation/kernel-parameters.txt | 9 + arch/x86/include/asm/nmi.h | 5 + arch/x86/kernel/irq.c | 3 + arch/x86/kernel/nmi.c | 302 +++++++++++++++++++++++++++++----- drivers/acpi/apei/ghes.c | 4 +- drivers/watchdog/hpwdt.c | 24 ++- 6 files changed, 292 insertions(+), 55 deletions(-) Don Zickus (7): events, perf: Pass protection and flags bits through mmap2 interface Revert "perf: Disable PERF_RECORD_MMAP2 support" perf: Update mmap2 interface with protection and flag bits perf report: Add mem-mode documentation to report command perf: Add cpumode to struct hist_entry perf: Add support to dynamically get cacheline size perf: Add dcacheline sort include/uapi/linux/perf_event.h | 1 + kernel/events/core.c | 37 ++++++++-- tools/perf/Documentation/perf-report.txt | 23 +++++++ tools/perf/builtin-report.c | 2 +- tools/perf/tests/dwarf-unwind.c | 2 +- tools/perf/util/cpumap.c | 31 +++++++++ tools/perf/util/cpumap.h | 12 ++++ tools/perf/util/event.c | 59 ++++++++++------ tools/perf/util/event.h | 2 + tools/perf/util/evsel.c | 1 + tools/perf/util/hist.c | 9 ++- tools/perf/util/hist.h | 1 + tools/perf/util/machine.c | 4 +- tools/perf/util/map.c | 4 +- tools/perf/util/map.h | 4 +- tools/perf/util/sort.c | 112 +++++++++++++++++++++++++++++++ tools/perf/util/sort.h | 2 + 17 files changed, 275 insertions(+), 31 deletions(-) -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/