linux/arch/um/kernel
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
..
skas um/ptrace: Fix the syscall number update after a ptrace 2016-09-07 09:25:04 -07:00
asm-offsets.c um: get rid of pointless include "..." where include <...> will do 2012-10-09 22:28:45 +02:00
config.c.in um: get rid of pointless include "..." where include <...> will do 2012-10-09 22:28:45 +02:00
dyn.lds.S nmi_backtrace: generate one-line reports for idle cpus 2016-10-07 18:46:30 -07:00
early_printk.c early_printk: consolidate random copies of identical code 2013-04-29 18:28:13 -07:00
exec.c um: get_safe_registers() should be done in flush_thread(), not start_thread() 2012-11-28 21:46:03 -05:00
exitcode.c uml: check length in exitcode_proc_write() 2013-10-30 12:24:49 -07:00
gmon_syms.c um: get rid of pointless include "..." where include <...> will do 2012-10-09 22:28:45 +02:00
gprof_syms.c um: get rid of pointless include "..." where include <...> will do 2012-10-09 22:28:45 +02:00
initrd.c um: Eliminate null test after alloc_bootmem 2016-08-04 00:00:06 +02:00
irq.c um: Remove broken SMP support 2015-04-13 21:00:58 +02:00
kmsg_dump.c um: add a kmsg_dumper 2015-04-13 21:17:37 +02:00
ksyms.c um: Move syscall() declaration into os.h 2015-05-31 13:14:07 +02:00
maccess.c um: Implement probe_kernel_read() 2013-09-07 10:38:34 +02:00
Makefile um: Support kcov 2016-08-04 00:18:06 +02:00
mem.c tree wide: get rid of __GFP_REPEAT for order-0 allocations part I 2016-06-24 17:23:52 -07:00
physmem.c um: Use char[] for linker script address declarations 2015-05-31 13:14:06 +02:00
process.c Merge branch 'for-linus-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml 2016-05-27 18:54:59 -07:00
ptrace.c um: Don't pollute kernel namespace with uapi 2015-06-25 22:44:11 +02:00
reboot.c um: Export pm_power_off 2016-03-05 22:17:52 +01:00
sigio.c um: get rid of pointless include "..." where include <...> will do 2012-10-09 22:28:45 +02:00
signal.c Revert "um: Fix get_signal() usage" 2016-03-05 22:16:40 +01:00
stacktrace.c um: Add support for CONFIG_STACKTRACE 2014-10-13 21:46:25 +02:00
syscall.c x86, um: switch to generic fork/vfork/clone 2012-11-28 22:13:44 -05:00
sysrq.c um: Remove dead code from stacktrace 2015-04-13 21:00:40 +02:00
time.c um: Switch clocksource to hrtimers 2015-11-06 22:54:49 +01:00
tlb.c um: Report host OOM more nicely 2015-11-06 22:49:12 +01:00
trap.c mm: do not pass mm_struct into handle_mm_fault 2016-07-26 16:19:19 -07:00
um_arch.c um: Setup physical memory in setup_arch() 2016-08-04 00:00:46 +02:00
umid.c um: get rid of pointless include "..." where include <...> will do 2012-10-09 22:28:45 +02:00
uml.lds.S nmi_backtrace: generate one-line reports for idle cpus 2016-10-07 18:46:30 -07:00
vmlinux.lds.S arm, cris, mips, sparc, powerpc, um, xtensa: fix build with bash 4.0 2009-09-20 12:28:22 +02:00