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

..

perf

metag/perf: Convert to hotplug state machine

2016-07-15 10:40:27 +02:00

.gitignore

metag: Build infrastructure

2013-03-02 20:09:54 +00:00

asm-offsets.c

metag: Build infrastructure

2013-03-02 20:09:54 +00:00

cachepart.c

metag: Fix typos

2016-07-15 09:55:49 +01:00

clock.c

metag: log core and timer frequencies from arch code

2013-06-13 12:55:27 +01:00

core_reg.c

metag: SMP support

2013-03-02 20:09:51 +00:00

da.c

metag: export _metag_da_present and cpu_2_hwthread_id

2013-03-27 14:37:52 +00:00

devtree.c

metag: use common of_flat_dt_match_machine

2013-10-09 20:03:57 -05:00

dma.c

dma-mapping: use unsigned long for dma_attrs

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

ftrace_stub.S

metag: ftrace: Remove check of obsolete variable function_trace_stop

2014-07-18 13:58:09 -04:00

ftrace.c

metag: ftrace: remove the misleading comment for ftrace_dyn_arch_init

2016-04-29 22:37:51 +01:00

head.S

metag: smp: copy cache partition and enable GCOn

2013-03-15 13:21:17 +00:00

irq.c

genirq: Remove irq argument from irq flow handlers

2015-09-16 15:47:51 +02:00

kick.c

metag: kick: add missing irq_enter/exit to kick_handler()

2013-07-02 14:12:08 +01:00

machines.c

…

Makefile

metag: Add JTAG Debug Adapter (DA) support

2013-03-02 20:09:56 +00:00

metag_ksyms.c

metag: move EXPORT_SYMBOL(csum_partial) to metag_ksyms.c

2013-07-04 10:00:02 +01:00

module.c

module: use a structure to encapsulate layout.

2015-12-04 22:46:25 +01:00

perf_callchain.c

perf core: Add a 'nr' field to perf_event_callchain_context

2016-05-16 23:11:51 -03:00

process.c

exit_thread: accept a task parameter to be exited

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

ptrace.c

metag: ptrace: Implement NT_METAG_TLS

2013-03-27 14:37:47 +00:00

setup.c

metag: Remove unnecessary of_platform_populate with default match table

2016-06-23 15:00:26 -05:00

signal.c

all arches, signal: move restart_block to struct task_struct

2015-02-12 18:54:12 -08:00

smp.c

arch/hotplug: Call into idle with a proper state

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

stacktrace.c

metag: Stack unwinding

2013-03-02 20:09:52 +00:00

sys_metag.c

metag: System Calls

2013-03-02 20:09:49 +00:00

tbiunexp.S

metag: Traps

2013-03-02 20:09:45 +00:00

tcm.c

…

time.c

metag: init common clk and use "core" clk

2013-06-13 12:54:41 +01:00

topology.c

metag: topology: export 'cpu_core_map'

2013-12-19 11:36:13 +00:00

traps.c

metag: handle low level kicks directly

2013-11-06 10:40:02 +00:00

user_gateway.S

metag: System Calls

2013-03-02 20:09:49 +00:00

vmlinux.lds.S

nmi_backtrace: generate one-line reports for idle cpus

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