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

..

vdso

tile/vdso: emit a GNU hash as well

2015-08-06 20:22:40 -04:00

asm-offsets.c

tile: check for correct compiler earlier in asm-offsets.c

2013-09-03 14:53:09 -04:00

backtrace.c

arch/tile: big-endian: properly bswap instruction bundles when backtracing

2012-06-18 13:11:21 -04:00

compat_signal.c

signal: fix information leak in copy_siginfo_from_user32

2015-08-07 04:39:40 +03:00

compat.c

tile 32-bit big-endian: fix bugs in syscall argument order

2016-06-15 15:31:01 -04:00

early_printk.c

printk: remove used-once early_vprintk

2014-12-10 17:41:10 -08:00

entry.S

nmi_backtrace: generate one-line reports for idle cpus

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

ftrace.c

ftrace: Add return address pointer to ftrace_ret_stack

2016-08-24 12:15:14 +02:00

hardwall.c

tile: use %*pb[l] to print bitmaps including cpumasks and nodemasks

2015-02-13 21:21:37 -08:00

head_32.S

tile: parameterize VA and PA space more cleanly

2013-09-03 14:47:34 -04:00

head_64.S

tile: parameterize VA and PA space more cleanly

2013-09-03 14:47:34 -04:00

hvglue_trace.c

tile: support delivering NMIs for multicore backtrace

2015-05-11 11:22:31 -04:00

hvglue.S

tile: support delivering NMIs for multicore backtrace

2015-05-11 11:22:31 -04:00

intvec_32.S

arch/tile: move user_exit() to early kernel entry sequence

2016-01-18 14:49:30 -05:00

intvec_64.S

arch/tile: move user_exit() to early kernel entry sequence

2016-01-18 14:49:30 -05:00

irq.c

tile: Use the more common pr_warn instead of pr_warning

2014-11-11 15:51:42 -05:00

jump_label.c

tile/jump_label: add jump label support for TILE-Gx

2016-01-04 15:09:31 -05:00

kgdb.c

tile: Fix misspellings in comments.

2016-03-04 14:44:57 -05:00

kprobes.c

tile: define a macro ktext_writable_addr to get writable kernel text address

2016-01-04 15:09:31 -05:00

machine_kexec.c

tile: Use the more common pr_warn instead of pr_warning

2014-11-11 15:51:42 -05:00

Makefile

tile/jump_label: add jump label support for TILE-Gx

2016-01-04 15:09:31 -05:00

mcount_64.S

tile: ftrace: fix function_graph tracer issues

2015-04-17 14:01:38 -04:00

messaging.c

tile: Use the more common pr_warn instead of pr_warning

2014-11-11 15:51:42 -05:00

module.c

module: remove mod arg from module_free, rename module_memfree().

2015-01-20 11:38:33 +10:30

pci_gx.c

Fix typo

2016-05-23 12:17:22 -04:00

pci-dma.c

dma-mapping: use unsigned long for dma_attrs

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

pci.c

PCI: Assign resources before drivers claim devices (pci_scan_root_bus())

2015-03-19 10:17:13 -05:00

perf_event.c

perf core: Pass max stack as a perf_callchain_entry context

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

pmc.c

arch/tile: adopt the new nmi_backtrace framework

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

proc.c

tile: use %*pb[l] to print bitmaps including cpumasks and nodemasks

2015-02-13 21:21:37 -08:00

process.c

arch/tile: adopt the new nmi_backtrace framework

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

ptrace.c

tile/ptrace: run seccomp after ptrace

2016-06-14 10:54:46 -07:00

reboot.c

tile: various console improvements

2013-08-12 14:46:18 -04:00

regs_32.S

tile: change <asm/system.h> to <asm/switch_to.h> in comments

2013-09-03 14:53:17 -04:00

regs_64.S

tile: change <asm/system.h> to <asm/switch_to.h> in comments

2013-09-03 14:53:17 -04:00

relocate_kernel_32.S

tile: remove support for TILE64

2013-09-03 14:53:29 -04:00

relocate_kernel_64.S

tile: remove support for TILE64

2013-09-03 14:53:29 -04:00

setup.c

include/linux/nodemask.h: create next_node_in() helper

2016-05-19 19:12:14 -07:00

signal.c

tile: Remove signal translation and exec_domain

2015-04-12 21:03:27 +02:00

single_step.c

arch/tile: move user_exit() to early kernel entry sequence

2016-01-18 14:49:30 -05:00

smp.c

tile: support arch_irq_work_raise

2015-04-17 12:58:44 -04:00

smpboot.c

arch/hotplug: Call into idle with a proper state

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

stack.c

tile: include the syscall number in the backtrace

2016-01-18 14:49:16 -05:00

sys.c

tile 32-bit big-endian: fix bugs in syscall argument order

2016-06-15 15:31:01 -04:00

sysfs.c

bus: subsys: update return type of ->remove_dev() to void

2015-08-05 17:08:14 -07:00

tile-desc_32.c

arch/tile: factor out <arch/opcode.h> header

2011-11-03 16:58:54 -04:00

tile-desc_64.c

arch/tile: factor out <arch/opcode.h> header

2011-11-03 16:58:54 -04:00

time.c

tile/time: Migrate to new 'set-state' interface

2015-07-30 12:32:15 -04:00

tlb.c

tile: do less L1 I-cache eviction

2013-08-30 11:56:34 -04:00

traps.c

arch/tile: adopt the new nmi_backtrace framework

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

unaligned.c

Fix typo

2016-05-23 12:17:22 -04:00

usb.c

tile: fix build failure

2015-09-28 11:23:39 -04:00

vdso.c

arm64,ia64,ppc,s390,sh,tile,um,x86,mm: remove default gate area

2014-08-08 15:57:27 -07:00

vmlinux.lds.S

nmi_backtrace: generate one-line reports for idle cpus

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