Chris Metcalf 6727ad9e20 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>

2016-10-07 18:46:30 -07:00

..

.gitignore

xtensa: tell git to ignore generated files

2013-06-05 10:14:19 -07:00

align.S

xtensa: allow single-stepping through unaligned load/store

2014-08-14 11:59:30 +04:00

asm-offsets.c

xtensa: support hardware breakpoints/watchpoints

2016-03-11 08:53:32 +00:00

coprocessor.S

xtensa: keep a3 and excsave1 on entry to exception handlers

2013-09-06 09:47:41 -07:00

entry.S

xtensa: cleanup MMU setup and kernel layout macros

2016-07-24 06:33:58 +03:00

head.S

xtensa: cleanup MMU setup and kernel layout macros

2016-07-24 06:33:58 +03:00

hw_breakpoint.c

xtensa: support hardware breakpoints/watchpoints

2016-03-11 08:53:32 +00:00

irq.c

Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-09-01 14:33:35 -07:00

Makefile

xtensa: support hardware breakpoints/watchpoints

2016-03-11 08:53:32 +00:00

mcount.S

xtensa: add static function tracer support

2013-07-08 01:18:57 -07:00

module.c

xtensa: clean up files to make them code-style compliant

2012-12-18 21:10:25 -08:00

mxhead.S

xtensa: drop unused sections and remapped reset handlers

2015-11-03 17:19:39 +03:00

pci-dma.c

dma-mapping: use unsigned long for dma_attrs

2016-08-04 08:50:07 -04:00

pci.c

PCI: Revert "PCI: Call pci_read_bridge_bases() from core instead of arch code"

2015-09-15 13:18:04 -05:00

perf_event.c

xtensa/perf: Convert the hotplug notifier to state machine callbacks

2016-07-14 09:34:41 +02:00

platform.c

xtensa: cleanup ccount frequency tracking

2013-07-08 01:11:37 -07:00

process.c

exit_thread: accept a task parameter to be exited

2016-05-20 17:58:30 -07:00

ptrace.c

xtensa: support hardware breakpoints/watchpoints

2016-03-11 08:53:32 +00:00

setup.c

Merge tag 'xtensa-20161005' of git://github.com/jcmvbkbc/linux-xtensa

2016-10-05 17:44:48 -07:00

signal.c

Merge branch 'exec_domain_rip_v2' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc

2015-04-15 13:53:55 -07:00

smp.c

arch/hotplug: Call into idle with a proper state

2016-03-01 20:36:57 +01:00

stacktrace.c

xtensa: move oprofile stack tracing to stacktrace.c

2015-08-17 07:32:49 +03:00

syscall.c

xtensa: nommu: don't provide arch_get_unmapped_area

2014-10-21 13:28:48 +04:00

time.c

xtensa: rearrange CCOUNT calibration

2016-09-20 18:52:59 -07:00

traps.c

xtensa: support hardware breakpoints/watchpoints

2016-03-11 08:53:32 +00:00

vectors.S

xtensa: use context structure for debug exceptions

2016-03-11 08:53:32 +00:00

vmlinux.lds.S

nmi_backtrace: generate one-line reports for idle cpus

2016-10-07 18:46:30 -07:00

xtensa_ksyms.c

xtensa: export __{invalidate,flush}_dcache_range

2014-04-02 01:35:50 +04:00