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lockup_detector: Introduce CONFIG_HARDLOCKUP_DETECTOR

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This new config is deemed to simplify even more the lockup detector
dependencies and can make it easier to bring a smooth sorting
between archs that support the new generic lockup detector and those
that still have their own, especially for those that are in the
middle of this migration.

Instead of checking whether we have CONFIG_LOCKUP_DETECTOR +
CONFIG_PERF_EVENTS_NMI each time an arch wants to know if it needs
to build its own lockup detector, take a shortcut with this new
config. It is enabled only if the hardlockup detection part of
the whole lockup detector is on.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
This commit is contained in:
Frederic Weisbecker 2010-05-15 23:15:20 +02:00
parent c01d432330
commit 23637d477c
4 changed files with 14 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
arch/Kconfig
View file

@ -147,5 +147,9 @@ config HAVE_USER_RETURN_NOTIFIER
config HAVE_PERF_EVENTS_NMI
bool
help
System hardware can generate an NMI using the perf event
subsystem. Also has support for calculating CPU cycle events
to determine how many clock cycles in a given period.
source "kernel/gcov/Kconfig"

7
init/Kconfig
View file

@ -942,13 +942,6 @@ config PERF_USE_VMALLOC
help
See tools/perf/design.txt for details
config PERF_EVENTS_NMI
def_bool PERF_EVENTS && HAVE_PERF_EVENTS_NMI
help
System hardware can generate an NMI using the perf event
subsystem. Also has support for calculating CPU cycle events
to determine how many clock cycles in a given period.
menu "Kernel Performance Events And Counters"
config PERF_EVENTS

14
kernel/watchdog.c
View file

@ -37,7 +37,7 @@ static DEFINE_PER_CPU(struct hrtimer, watchdog_hrtimer);
static DEFINE_PER_CPU(bool, softlockup_touch_sync);
static DEFINE_PER_CPU(bool, hard_watchdog_warn);
static DEFINE_PER_CPU(bool, soft_watchdog_warn);
#ifdef CONFIG_PERF_EVENTS_NMI
#ifdef CONFIG_HARDLOCKUP_DETECTOR
static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts);
static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts_saved);
static DEFINE_PER_CPU(struct perf_event *, watchdog_ev);
@ -51,7 +51,7 @@ static int __initdata no_watchdog;
/*
* Should we panic when a soft-lockup or hard-lockup occurs:
*/
#ifdef CONFIG_PERF_EVENTS_NMI
#ifdef CONFIG_HARDLOCKUP_DETECTOR
static int hardlockup_panic;
static int __init hardlockup_panic_setup(char *str)
@ -152,7 +152,7 @@ void touch_softlockup_watchdog_sync(void)
__raw_get_cpu_var(watchdog_touch_ts) = 0;
}
#ifdef CONFIG_PERF_EVENTS_NMI
#ifdef CONFIG_HARDLOCKUP_DETECTOR
/* watchdog detector functions */
static int is_hardlockup(int cpu)
{
@ -189,7 +189,7 @@ static struct notifier_block panic_block = {
.notifier_call = watchdog_panic,
};
#ifdef CONFIG_PERF_EVENTS_NMI
#ifdef CONFIG_HARDLOCKUP_DETECTOR
static struct perf_event_attr wd_hw_attr = {
.type = PERF_TYPE_HARDWARE,
.config = PERF_COUNT_HW_CPU_CYCLES,
@ -239,7 +239,7 @@ static void watchdog_interrupt_count(void)
}
#else
static inline void watchdog_interrupt_count(void) { return; }
#endif /* CONFIG_PERF_EVENTS_NMI */
#endif /* CONFIG_HARDLOCKUP_DETECTOR */
/* watchdog kicker functions */
static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
@ -342,7 +342,7 @@ static int watchdog(void *__bind_cpu)
}
#ifdef CONFIG_PERF_EVENTS_NMI
#ifdef CONFIG_HARDLOCKUP_DETECTOR
static int watchdog_nmi_enable(int cpu)
{
struct perf_event_attr *wd_attr;
@ -393,7 +393,7 @@ static void watchdog_nmi_disable(int cpu)
#else
static int watchdog_nmi_enable(int cpu) { return 0; }
static void watchdog_nmi_disable(int cpu) { return; }
#endif /* CONFIG_PERF_EVENTS_NMI */
#endif /* CONFIG_HARDLOCKUP_DETECTOR */
/* prepare/enable/disable routines */
static int watchdog_prepare_cpu(int cpu)

3
lib/Kconfig.debug
View file

@ -174,6 +174,9 @@ config LOCKUP_DETECTOR
generate interrupts and kick the watchdog task every 10-12 seconds.
An NMI is generated every 60 seconds or so to check for hardlockups.
config HARDLOCKUP_DETECTOR
def_bool LOCKUP_DETECTOR && PERF_EVENTS && HAVE_PERF_EVENTS_NMI
config BOOTPARAM_SOFTLOCKUP_PANIC
bool "Panic (Reboot) On Soft Lockups"
depends on LOCKUP_DETECTOR