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Message-ID: <1458147733-29338-1-git-send-email-cmetcalf@mellanox.com> Date: Wed, 16 Mar 2016 13:02:09 -0400 From: Chris Metcalf <cmetcalf@...lanox.com> To: Peter Zijlstra <peterz@...radead.org>, Russell King <linux@....linux.org.uk>, Thomas Gleixner <tglx@...utronix.de>, Aaron Tomlin <atomlin@...hat.com>, Ingo Molnar <mingo@...hat.com>, Andrew Morton <akpm@...l.org>, Daniel Thompson <daniel.thompson@...aro.org>, <x86@...nel.org>, <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org> CC: Chris Metcalf <cmetcalf@...lanox.com> Subject: [PATCH v2 0/4] improvements to the nmi_backtrace code >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. Version 2 of the patch series adopts the CPUIDLE_TEXT approach that I suggested in some discussion around identifying idle cpus, and that Peter Zijlstra endorsed. I renumbered the patches to put the idle-test patch last in the series (4/4) and it is the only one modified in this version of the patch series. (To be fair I did also change all the S-O-B and author lines to be mellanox.com instead of ezchip.com). 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. v1 of the series is here: https://lkml.kernel.org/r/1456782024-7122-1-git-send-email-cmetcalf@ezchip.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.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/apic/hw_nmi.c | 6 +-- arch/x86/kernel/process.c | 4 +- arch/x86/kernel/vmlinux.lds.S | 1 + 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 | 40 +++++++++++++------- scripts/mod/modpost.c | 4 +- scripts/recordmcount.c | 1 + scripts/recordmcount.pl | 1 + 52 files changed, 172 insertions(+), 115 deletions(-) -- 2.7.2
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