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| author | Mandeep Singh Baines | 2009-01-15 20:08:40 +0100 |
|---|---|---|
| committer | Ingo Molnar | 2009-01-16 14:06:04 +0100 |
| commit | e162b39a368f0401e41b558f430c354d12a85b37 (patch) | |
| tree | 3fb7e4d48f398d62e5074e7e3dd183cc54f59820 /include/linux/sched.h | |
| parent | rcu: move Kconfig menu (diff) | |
| download | kernel-qcow2-linux-e162b39a368f0401e41b558f430c354d12a85b37.tar.gz kernel-qcow2-linux-e162b39a368f0401e41b558f430c354d12a85b37.tar.xz kernel-qcow2-linux-e162b39a368f0401e41b558f430c354d12a85b37.zip | |
softlockup: decouple hung tasks check from softlockup detection
Decoupling allows:
* hung tasks check to happen at very low priority
* hung tasks check and softlockup to be enabled/disabled independently
at compile and/or run-time
* individual panic settings to be enabled disabled independently
at compile and/or run-time
* softlockup threshold to be reduced without increasing hung tasks
poll frequency (hung task check is expensive relative to softlock watchdog)
* hung task check to be zero over-head when disabled at run-time
Signed-off-by: Mandeep Singh Baines <msb@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 54cbabf3b871..f2f94d532302 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -297,9 +297,6 @@ extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write, struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos); extern unsigned int softlockup_panic; -extern unsigned long sysctl_hung_task_check_count; -extern unsigned long sysctl_hung_task_timeout_secs; -extern unsigned long sysctl_hung_task_warnings; extern int softlockup_thresh; #else static inline void softlockup_tick(void) @@ -316,6 +313,15 @@ static inline void touch_all_softlockup_watchdogs(void) } #endif +#ifdef CONFIG_DETECT_HUNG_TASK +extern unsigned int sysctl_hung_task_panic; +extern unsigned long sysctl_hung_task_check_count; +extern unsigned long sysctl_hung_task_timeout_secs; +extern unsigned long sysctl_hung_task_warnings; +extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, + struct file *filp, void __user *buffer, + size_t *lenp, loff_t *ppos); +#endif /* Attach to any functions which should be ignored in wchan output. */ #define __sched __attribute__((__section__(".sched.text"))) @@ -1236,7 +1242,7 @@ struct task_struct { /* ipc stuff */ struct sysv_sem sysvsem; #endif -#ifdef CONFIG_DETECT_SOFTLOCKUP +#ifdef CONFIG_DETECT_HUNG_TASK /* hung task detection */ unsigned long last_switch_timestamp; unsigned long last_switch_count; |