From mboxrd@z Thu Jan 1 00:00:00 1970 From: cmetcalf@mellanox.com (Chris Metcalf) Date: Thu, 14 Jul 2016 16:50:28 -0400 Subject: [PATCH v6 0/4] improvements to the nmi_backtrace code In-Reply-To: <96e5ba5b-d8c2-42cd-11a3-ffebd85522c3@mellanox.com> Message-ID: <1468529432-28026-1-git-send-email-cmetcalf@mellanox.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This is a straight rebasing of the v5 series onto v4.7-rc7, plus I now show Aaron Tomlin's ack for patch 2/4, and review of patch 1/4. >>From the version 1 cover letter: This patch series modifies the trigger_xxx_backtrace() NMI-based remote backtracing code to make it more flexible, and makes a few small improvements along the way. The motivation comes from the task isolation code, where there are scenarios where we want to be able to diagnose a case where some cpu is about to interrupt a task-isolated cpu. It can be helpful to see both where the interrupting cpu is, and also an approximation of where the cpu that is being interrupted is. The nmi_backtrace framework allows us to discover the stack of the interrupted cpu. I've tested that the change works as desired on tile, and build-tested x86, arm64, and arm. For x86 and arm64 I confirmed that the generic cpuidle stuff as well as the architecture-specific routines are in the new cpuidle section. For arm I just build-tested it and made sure the generic cpuidle routines were in the new cpuidle section, but I didn't attempt to tease apart the tangle of platform-specific idle routines that arm has and tag them with __cpuidle. That might be more usefully done by someone with arm platform experience in a follow-up patch. I have also pushed it up to kernel.org to pull if that's easier: git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile.git nmi-backtrace v6: Rebased to kernel v4.7-rc7 v5: Add CPUIDLE_TEXT to the new arch/arm/kernel/vmlinux-xip.lds.S https://lkml.kernel.org/g/1459877208-15119-1-git-send-email-cmetcalf at mellanox.com v4: Added some more __cpuidle functions (PeterZ, Rafael Wysocki) Rebased to kernel v4.6-rc1 https://lkml.kernel.org/g/1459358170-27745-1-git-send-email-cmetcalf at mellanox.com v3: Various improvements to the set of __cpuidle functions; Add back in a missing section accidentally removed in modpost.c (PeterZ) https://lkml.kernel.org/r/1458667179-19630-1-git-send-email-cmetcalf at mellanox.com v2: Switch to using __cpuidle tagging, switch S-O-B to Mellanox https://lkml.kernel.org/r/1458147733-29338-1-git-send-email-cmetcalf at mellanox.com Chris Metcalf (4): nmi_backtrace: add more trigger_*_cpu_backtrace() methods nmi_backtrace: do a local dump_stack() instead of a self-NMI arch/tile: adopt the new nmi_backtrace framework nmi_backtrace: generate one-line reports for idle cpus arch/alpha/kernel/vmlinux.lds.S | 1 + arch/arc/kernel/vmlinux.lds.S | 1 + arch/arm/include/asm/irq.h | 4 +- arch/arm/kernel/smp.c | 13 +------ arch/arm/kernel/vmlinux-xip.lds.S | 1 + arch/arm/kernel/vmlinux.lds.S | 1 + arch/arm64/kernel/vmlinux.lds.S | 1 + arch/arm64/mm/proc.S | 2 + arch/avr32/kernel/vmlinux.lds.S | 1 + arch/blackfin/kernel/vmlinux.lds.S | 1 + arch/c6x/kernel/vmlinux.lds.S | 1 + arch/cris/kernel/vmlinux.lds.S | 1 + arch/frv/kernel/vmlinux.lds.S | 1 + arch/h8300/kernel/vmlinux.lds.S | 1 + arch/hexagon/kernel/vmlinux.lds.S | 1 + arch/ia64/kernel/vmlinux.lds.S | 1 + arch/m32r/kernel/vmlinux.lds.S | 1 + arch/m68k/kernel/vmlinux-nommu.lds | 1 + arch/m68k/kernel/vmlinux-std.lds | 1 + arch/m68k/kernel/vmlinux-sun3.lds | 1 + arch/metag/kernel/vmlinux.lds.S | 1 + arch/microblaze/kernel/vmlinux.lds.S | 1 + arch/mips/kernel/vmlinux.lds.S | 1 + arch/mn10300/kernel/vmlinux.lds.S | 1 + arch/nios2/kernel/vmlinux.lds.S | 1 + arch/openrisc/kernel/vmlinux.lds.S | 1 + arch/parisc/kernel/vmlinux.lds.S | 1 + arch/powerpc/kernel/vmlinux.lds.S | 1 + arch/s390/kernel/vmlinux.lds.S | 1 + arch/score/kernel/vmlinux.lds.S | 1 + arch/sh/kernel/vmlinux.lds.S | 1 + arch/sparc/kernel/vmlinux.lds.S | 1 + arch/tile/include/asm/irq.h | 4 +- arch/tile/kernel/entry.S | 2 +- arch/tile/kernel/pmc.c | 3 -- arch/tile/kernel/process.c | 72 ++++++++---------------------------- arch/tile/kernel/traps.c | 7 +++- arch/tile/kernel/vmlinux.lds.S | 1 + arch/um/kernel/dyn.lds.S | 1 + arch/um/kernel/uml.lds.S | 1 + arch/unicore32/kernel/vmlinux.lds.S | 1 + arch/x86/include/asm/irq.h | 4 +- arch/x86/kernel/acpi/cstate.c | 2 +- arch/x86/kernel/apic/hw_nmi.c | 6 +-- arch/x86/kernel/process.c | 4 +- arch/x86/kernel/vmlinux.lds.S | 1 + arch/xtensa/kernel/vmlinux.lds.S | 3 ++ drivers/acpi/processor_idle.c | 5 ++- drivers/cpuidle/driver.c | 5 ++- drivers/idle/intel_idle.c | 4 +- include/asm-generic/vmlinux.lds.h | 6 +++ include/linux/cpu.h | 5 +++ include/linux/nmi.h | 63 ++++++++++++++++++++++++------- kernel/sched/idle.c | 13 ++++++- lib/nmi_backtrace.c | 39 ++++++++++++------- scripts/mod/modpost.c | 2 +- scripts/recordmcount.c | 1 + scripts/recordmcount.pl | 1 + 58 files changed, 184 insertions(+), 120 deletions(-) -- 2.7.2