Randy Dunlap bfe8df3d31 slow down printk during boot ...

Optionally add a boot delay after each kernel printk() call, crudely
measured in milliseconds, with a maximum delay of 10 seconds per printk.

Enable CONFIG_BOOT_PRINTK_DELAY=y and then add (e.g.):
"lpj=loops_per_jiffy boot_delay=100"
to the kernel command line.

It has been useful in cases like "during boot, my machine just reboots or the
screen goes black" by slowing down printk, (and adding initcall_debug), we can
usually see the last thing that happened before the lights went out which is
usually a valuable clue.

[akpm@linux-foundation.org: not all architectures implement CONFIG_HZ]
[akpm@linux-foundation.org: fix lots of stuff]
[bunk@stusta.de: kernel/printk.c: make 2 variables static]
[heiko.carstens@de.ibm.com: fix slow down printk on boot compile error]
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2007-10-16 09:42:49 -07:00

..

irq

request_irq: fix DEBUG_SHIRQ handling

2007-08-31 01:42:23 -07:00

power

hibernation doesn't even build on frv - tons of helpers are missing

2007-09-26 09:22:04 -07:00

time

clockevents: introduce force broadcast notifier

2007-10-14 22:57:45 +02:00

.gitignore

…

acct.c

Cleanup non-arch xtime uses, use get_seconds() or current_kernel_time().

2007-07-25 10:09:20 -07:00

audit.c

[NET]: make netlink user -> kernel interface synchronious

2007-10-10 21:15:29 -07:00

audit.h

Audit: add TTY input auditing

2007-07-16 09:05:47 -07:00

auditfilter.c

[PATCH] allow audit filtering on bit & operations

2007-07-22 09:57:02 -04:00

auditsc.c

SUNRPC: Convert rpc_pipefs to use the generic filesystem notification hooks

2007-10-09 17:15:26 -04:00

capability.c

[PATCH] pid: replace do/while_each_task_pid with do/while_each_pid_task

2007-02-12 09:48:32 -08:00

compat.c

signal/timer/event: timerfd compat code

2007-05-11 08:29:36 -07:00

configs.c

use simple_read_from_buffer in kernel/

2007-05-09 12:30:49 -07:00

cpu.c

PM: Fix dependencies of CONFIG_SUSPEND and CONFIG_HIBERNATION

2007-08-31 01:42:22 -07:00

cpuset.c

usermodehelper: Tidy up waiting

2007-07-18 08:47:40 -07:00

delayacct.c

sched: clean up schedstats, cnt -> count

2007-10-15 17:00:12 +02:00

die_notifier.c

move die notifier handling to common code

2007-05-08 11:15:04 -07:00

dma.c

[PATCH] struct seq_operations and struct file_operations constification

2006-12-07 08:39:46 -08:00

exec_domain.c

Remove obsolete #include <linux/config.h>

2006-06-30 19:25:36 +02:00

exit.c

sched: guest CPU accounting: add guest-CPU /proc/<pid>/stat fields

2007-10-15 17:00:19 +02:00

extable.c

[PATCH] symbol_put_addr() locks kernel

2006-05-15 11:20:55 -07:00

fork.c

sched: guest CPU accounting: add guest-CPU /proc/<pid>/stat fields

2007-10-15 17:00:19 +02:00

futex_compat.c

robust futex thread exit race

2007-10-01 07:52:23 -07:00

futex.c

robust futex thread exit race

2007-10-01 07:52:23 -07:00

hrtimer.c

[KTIME]: Introduce ktime_sub_ns and ktime_sub_us

2007-10-10 16:48:12 -07:00

itimer.c

The scheduled -EINVAL for invalid timevals in setitimer

2007-05-08 11:15:13 -07:00

kallsyms.c

kallsyms: make KSYM_NAME_LEN include space for trailing '\0'

2007-07-17 10:23:03 -07:00

Kconfig.hz

[PATCH] HZ: 300Hz support

2006-12-07 08:39:36 -08:00

Kconfig.preempt

[PATCH] sched: arch preempt notifier mechanism

2007-07-26 13:40:43 +02:00

kexec.c

kdump/kexec: calculate note size at compile time

2007-05-08 11:15:07 -07:00

kfifo.c

is_power_of_2: kernel/kfifo.c

2007-07-16 09:05:50 -07:00

kmod.c

Restore call_usermodehelper_pipe() behaviour

2007-09-11 17:21:20 -07:00

kprobes.c

fix compilation with gcc 4.2

2007-08-11 15:47:42 -07:00

ksysfs.c

sched: group scheduling, sysfs tunables

2007-10-15 17:00:14 +02:00

kthread.c

kthread: silence bogus section mismatch warning

2007-07-31 15:39:42 -07:00

latency.c

[PATCH] severing module.h->sched.h

2006-12-04 02:00:22 -05:00

lockdep_internals.h

[PATCH] lockdep: more chains

2006-12-07 08:39:43 -08:00

lockdep_proc.c

lockdep: Avoid /proc/lockdep & lock_stat infinite output

2007-10-11 22:11:11 +02:00

lockdep.c

lockdep: syscall exit check

2007-10-11 22:11:12 +02:00

Makefile

user namespace: add the framework

2007-07-16 09:05:47 -07:00

module.c

Fix Off-by-one in /sys/module/*/refcnt

2007-08-22 14:35:35 -07:00

mutex-debug.c

[PATCH] remove many unneeded #includes of sched.h

2007-02-14 08:09:54 -08:00

mutex-debug.h

[PATCH] lockdep: better lock debugging

2006-07-03 15:27:01 -07:00

mutex.c

lockdep: fixup mutex annotations

2007-10-11 22:11:12 +02:00

mutex.h

[PATCH] lockdep: prove mutex locking correctness

2006-07-03 15:27:04 -07:00

nsproxy.c

[NET]: Add network namespace clone & unshare support.

2007-10-10 16:52:46 -07:00

panic.c

Report that kernel is tainted if there was an OOPS

2007-07-17 10:23:02 -07:00

params.c

modules: better error messages when modules fail to load due to a sysfs problem.

2007-07-30 14:25:23 -07:00

pid.c

namespace: ensure clone_flags are always stored in an unsigned long

2007-07-16 09:05:48 -07:00

posix-cpu-timers.c

sched: make posix-cpu-timers use CFS's accounting information

2007-07-09 18:51:58 +02:00

posix-timers.c

more low-hanging fruits - kernel, fs, lib signedness

2007-10-14 12:41:52 -07:00

printk.c

slow down printk during boot

2007-10-16 09:42:49 -07:00

profile.c

fix compilation with gcc 4.2

2007-08-11 15:47:42 -07:00

ptrace.c

Consolidate PTRACE_DETACH

2007-10-16 09:42:49 -07:00

rcupdate.c

lockdep: annotate rcu_read_{,un}lock{,_bh}

2007-10-11 22:11:12 +02:00

rcutorture.c

Freezer: make kernel threads nonfreezable by default

2007-07-17 10:23:02 -07:00

relay.c

Fix a use after free bug in kernel->userspace relay file support

2007-07-31 15:39:42 -07:00

resource.c

libata/IDE: remove combined mode quirk

2007-04-28 14:15:59 -04:00

rtmutex_common.h

FUTEX: Tidy up the code

2007-07-16 09:05:49 -07:00

rtmutex-debug.c

FUTEX: Tidy up the code

2007-07-16 09:05:49 -07:00

rtmutex-debug.h

[PATCH] lockdep: better lock debugging

2006-07-03 15:27:01 -07:00

rtmutex-tester.c

Freezer: make kernel threads nonfreezable by default

2007-07-17 10:23:02 -07:00

rtmutex.c

FUTEX: Tidy up the code

2007-07-16 09:05:49 -07:00

rtmutex.h

[PATCH] lockdep: better lock debugging

2006-07-03 15:27:01 -07:00

rwsem.c

lockstat: hook into spinlock_t, rwlock_t, rwsem and mutex

2007-07-19 10:04:49 -07:00

sched_debug.c

Make scheduler debug file operations const

2007-10-15 17:00:19 +02:00

sched_fair.c

sched: reintroduce cache-hot affinity

2007-10-15 17:00:18 +02:00

sched_idletask.c

sched: mark scheduling classes as const

2007-10-15 17:00:12 +02:00

sched_rt.c

sched: tidy up SCHED_RR

2007-10-15 17:00:13 +02:00

sched_stats.h

sched: clean up schedstats, cnt -> count

2007-10-15 17:00:12 +02:00

sched.c

sched: sync wakeups preempt too

2007-10-15 17:00:20 +02:00

seccomp.c

make seccomp zerocost in schedule

2007-07-16 09:05:50 -07:00

signal.c

fix bogus reporting of signals by audit

2007-10-07 16:28:43 -07:00

softirq.c

[KERNEL]: Unexport raise_softirq_irqoff

2007-10-10 16:49:18 -07:00

softlockup.c

Freezer: make kernel threads nonfreezable by default

2007-07-17 10:23:02 -07:00

spinlock.c

lockstat: hook into spinlock_t, rwlock_t, rwsem and mutex

2007-07-19 10:04:49 -07:00

srcu.c

[PATCH] SRCU: report out-of-memory errors

2006-10-04 07:55:30 -07:00

stacktrace.c

[PATCH] lockdep: stacktrace subsystem, core

2006-07-03 15:27:02 -07:00

stop_machine.c

Fix stop_machine_run problem with naughty real time process

2007-07-16 09:05:41 -07:00

sys_ni.c

diskquota: 32bit quota tools on 64bit architectures

2007-07-16 09:05:48 -07:00

sys.c

Fix SMP poweroff hangs

2007-10-01 07:52:23 -07:00

sysctl.c

sched: reintroduce cache-hot affinity

2007-10-15 17:00:18 +02:00

taskstats.c

taskstats: add context-switch counters

2007-07-16 09:05:46 -07:00

time.c

Cleanup non-arch xtime uses, use get_seconds() or current_kernel_time().

2007-07-25 10:09:20 -07:00

timer.c

Pull ia64-clocksource into release branch

2007-07-20 11:26:47 -07:00

tsacct.c

Cleanup non-arch xtime uses, use get_seconds() or current_kernel_time().

2007-07-25 10:09:20 -07:00

uid16.c

header cleaning: don't include smp_lock.h when not used

2007-05-08 11:15:07 -07:00

user_namespace.c

Fix user namespace exiting OOPs

2007-09-19 11:24:18 -07:00

user.c

sched: generate uevents for user creation/destruction

2007-10-15 17:00:18 +02:00

utsname_sysctl.c

remove CONFIG_UTS_NS and CONFIG_IPC_NS

2007-07-16 09:05:47 -07:00

utsname.c

Fix UTS corruption during clone(CLONE_NEWUTS)

2007-09-19 11:24:17 -07:00

wait.c

Fix occurrences of "the the "

2007-05-09 08:57:56 +02:00

workqueue.c

fix bogus hotplug cpu warning

2007-08-27 10:27:48 -07:00