]> git.proxmox.com Git - mirror_ubuntu-hirsute-kernel.git/commit
nmi_backtrace: generate one-line reports for idle cpus
authorChris Metcalf <cmetcalf@mellanox.com>
Sat, 8 Oct 2016 00:02:55 +0000 (17:02 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 8 Oct 2016 01:46:30 +0000 (18:46 -0700)
commit6727ad9e206cc08b80d8000a4d67f8417e53539d
tree3f9ca202417b08918547d5db776d041fa4ee61e3
parent511f8389454e55ece5115dc3bc84a0947788ff4f
nmi_backtrace: generate one-line reports for idle cpus

When doing an nmi backtrace of many cores, most of which are idle, the
output is a little overwhelming and very uninformative.  Suppress
messages for cpus that are idling when they are interrupted and just
emit one line, "NMI backtrace for N skipped: idling at pc 0xNNN".

We do this by grouping all the cpuidle code together into a new
.cpuidle.text section, and then checking the address of the interrupted
PC to see if it lies within that section.

This commit suitably tags x86 and tile idle routines, and only adds in
the minimal framework for other architectures.

Link: http://lkml.kernel.org/r/1472487169-14923-5-git-send-email-cmetcalf@mellanox.com
Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Daniel Thompson <daniel.thompson@linaro.org> [arm]
Tested-by: Petr Mladek <pmladek@suse.com>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
49 files changed:
arch/alpha/kernel/vmlinux.lds.S
arch/arc/kernel/vmlinux.lds.S
arch/arm/kernel/vmlinux-xip.lds.S
arch/arm/kernel/vmlinux.lds.S
arch/arm64/kernel/vmlinux.lds.S
arch/avr32/kernel/vmlinux.lds.S
arch/blackfin/kernel/vmlinux.lds.S
arch/c6x/kernel/vmlinux.lds.S
arch/cris/kernel/vmlinux.lds.S
arch/frv/kernel/vmlinux.lds.S
arch/h8300/kernel/vmlinux.lds.S
arch/hexagon/kernel/vmlinux.lds.S
arch/ia64/kernel/vmlinux.lds.S
arch/m32r/kernel/vmlinux.lds.S
arch/m68k/kernel/vmlinux-nommu.lds
arch/m68k/kernel/vmlinux-std.lds
arch/m68k/kernel/vmlinux-sun3.lds
arch/metag/kernel/vmlinux.lds.S
arch/microblaze/kernel/vmlinux.lds.S
arch/mips/kernel/vmlinux.lds.S
arch/mn10300/kernel/vmlinux.lds.S
arch/nios2/kernel/vmlinux.lds.S
arch/openrisc/kernel/vmlinux.lds.S
arch/parisc/kernel/vmlinux.lds.S
arch/powerpc/kernel/vmlinux.lds.S
arch/s390/kernel/vmlinux.lds.S
arch/score/kernel/vmlinux.lds.S
arch/sh/kernel/vmlinux.lds.S
arch/sparc/kernel/vmlinux.lds.S
arch/tile/kernel/entry.S
arch/tile/kernel/vmlinux.lds.S
arch/um/kernel/dyn.lds.S
arch/um/kernel/uml.lds.S
arch/unicore32/kernel/vmlinux.lds.S
arch/x86/include/asm/irqflags.h
arch/x86/kernel/acpi/cstate.c
arch/x86/kernel/process.c
arch/x86/kernel/vmlinux.lds.S
arch/xtensa/kernel/vmlinux.lds.S
drivers/acpi/processor_idle.c
drivers/cpuidle/driver.c
drivers/idle/intel_idle.c
include/asm-generic/vmlinux.lds.h
include/linux/cpu.h
kernel/sched/idle.c
lib/nmi_backtrace.c
scripts/mod/modpost.c
scripts/recordmcount.c
scripts/recordmcount.pl