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

..

cpu

sh/SH-X3 SMP: Convert to hotplug state machine

2016-09-19 21:44:27 +02:00

vsyscall

vdso: make arch_setup_additional_pages wait for mmap_sem for write killable

2016-05-23 17:04:14 -07:00

.gitignore

…

asm-offsets.c

sh: Remove signal translation and exec_domain

2015-04-12 20:58:25 +02:00

crash_dump.c

…

debugtraps.S

…

disassemble.c

…

dma-nommu.c

dma-mapping: use unsigned long for dma_attrs

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

dumpstack.c

sh: fix format string bug in stack tracer

2014-04-03 16:20:49 -07:00

dwarf.c

sh: Delete unnecessary checks before the function call "mempool_destroy"

2016-08-05 03:29:42 +00:00

entry-common.S

sh: provide unified syscall trap compatible with all SH models

2016-03-17 19:46:06 +00:00

ftrace.c

Merge tag 'trace-v4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2016-10-06 11:48:41 -07:00

head_32.S

sh: fix build regression with CONFIG_OF && !CONFIG_OF_FLATTREE

2016-07-31 03:33:32 +00:00

head_64.S

…

hw_breakpoint.c

sh: Replace __get_cpu_var uses

2014-06-04 16:53:52 -07:00

idle.c

sched/idle, SH: Remove redundant cpuidle_idle_call()

2014-02-11 09:58:26 +01:00

io_trapped.c

Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP

2014-04-07 16:36:11 -07:00

io.c

…

iomap.c

…

ioport.c

sections: fix section conflicts in arch/sh

2012-10-06 03:04:40 +09:00

irq_32.c

…

irq_64.c

…

irq.c

sh/irq: Use access helper irq_data_get_affinity_mask()

2015-07-29 10:08:08 +02:00

kdebugfs.c

…

kgdb.c

arch/sh/kernel/kgdb.c: add missing #include <linux/sched.h>

2014-01-21 16:19:42 -08:00

kprobes.c

sh: Replace __get_cpu_var uses

2014-06-04 16:53:52 -07:00

machine_kexec.c

…

machvec.c

sh: Kill off machvec IRQ hinting.

2012-05-21 17:54:01 +09:00

Makefile

sh: remove arch-specific localtimer and use generic one

2016-03-17 19:46:09 +00:00

module.c

…

nmi_debug.c

…

perf_callchain.c

perf core: Pass max stack as a perf_callchain_entry context

2016-05-16 23:11:50 -03:00

perf_event.c

sh/perf: Convert the hotplug notifiers to state machine callbacks

2016-07-14 09:34:39 +02:00

process_32.c

exit_thread: remove empty bodies

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

process_64.c

exit_thread: accept a task parameter to be exited

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

process.c

sh: delete __cpuinit usage from all sh files

2013-07-14 19:36:53 -04:00

ptrace_32.c

ARCH: AUDIT: audit_syscall_entry() should not require the arch

2014-09-23 16:21:26 -04:00

ptrace_64.c

ARCH: AUDIT: audit_syscall_entry() should not require the arch

2014-09-23 16:21:26 -04:00

ptrace.c

…

reboot.c

Disintegrate asm/system.h for SH

2012-03-28 18:30:03 +01:00

relocate_kernel.S

…

return_address.c

…

setup.c

sh: fix build regression with CONFIG_OF && !CONFIG_OF_FLATTREE

2016-07-31 03:33:32 +00:00

sh_bios.c

early_printk: consolidate random copies of identical code

2013-04-29 18:28:13 -07:00

sh_ksyms_32.c

sh: New gcc support

2016-03-17 19:45:44 +00:00

sh_ksyms_64.c

sh: use the new generic strnlen_user() function

2012-06-13 10:28:37 +09:00

signal_32.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

signal_64.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

Merge tag 'tag-sh-for-4.6' of git://git.libc.org/linux-sh

2016-03-19 16:09:43 -07:00

stacktrace.c

…

swsusp.c

…

sys_sh32.c

sh: push extra copy of r0-r2 for syscall parameters

2014-04-03 16:20:52 -07:00

sys_sh.c

…

syscalls_32.S

sh: system call wire up

2016-08-05 03:29:44 +00:00

syscalls_64.S

sh: system call wire up

2016-08-05 03:29:44 +00:00

time.c

Merge tag 'sh-for-4.8' of git://git.libc.org/linux-sh

2016-08-06 09:00:05 -04:00

topology.c

sh: fix function signature of cpu_coregroup_mask to match pointer type

2016-03-30 00:47:49 +00:00

traps_32.c

sh: don't pass saved userspace state to exception handlers

2014-04-03 16:20:52 -07:00

traps_64.c

arch/sh/kernel/traps_64.c: use sign_extend64() for sign extension

2015-11-06 17:50:42 -08:00

traps.c

taint: add explicit flag to show whether lock dep is still OK.

2013-01-21 17:17:57 +10:30

unwinder.c

…

vmlinux.lds.S

nmi_backtrace: generate one-line reports for idle cpus

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