From 8446f1d391f3d27e6bf9c43d4cbcdac0ca720417 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Tue, 6 Sep 2005 15:16:27 -0700 Subject: [PATCH] detect soft lockups This patch adds a new kernel debug feature: CONFIG_DETECT_SOFTLOCKUP. When enabled then per-CPU watchdog threads are started, which try to run once per second. If they get delayed for more than 10 seconds then a callback from the timer interrupt detects this condition and prints out a warning message and a stack dump (once per lockup incident). The feature is otherwise non-intrusive, it doesnt try to unlock the box in any way, it only gets the debug info out, automatically, and on all CPUs affected by the lockup. Signed-off-by: Ingo Molnar Signed-off-by: Nishanth Aravamudan Signed-Off-By: Matthias Urlichs Signed-off-by: Richard Purdie Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/sched.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'include/linux/sched.h') diff --git a/include/linux/sched.h b/include/linux/sched.h index dec5827c7742..5fb31bede103 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -176,6 +176,23 @@ extern void trap_init(void); extern void update_process_times(int user); extern void scheduler_tick(void); +#ifdef CONFIG_DETECT_SOFTLOCKUP +extern void softlockup_tick(struct pt_regs *regs); +extern void spawn_softlockup_task(void); +extern void touch_softlockup_watchdog(void); +#else +static inline void softlockup_tick(struct pt_regs *regs) +{ +} +static inline void spawn_softlockup_task(void) +{ +} +static inline void touch_softlockup_watchdog(void) +{ +} +#endif + + /* Attach to any functions which should be ignored in wchan output. */ #define __sched __attribute__((__section__(".sched.text"))) /* Is this address in the __sched functions? */ -- cgit v1.2.3 From 36d57ac4a818cb4aa3edbdf63ad2ebc31106f925 Mon Sep 17 00:00:00 2001 From: "H. J. Lu" Date: Tue, 6 Sep 2005 15:16:49 -0700 Subject: [PATCH] auxiliary vector cleanups The size of auxiliary vector is fixed at 42 in linux/sched.h. But it isn't very obvious when looking at linux/elf.h. This patch adds AT_VECTOR_SIZE so that we can change it if necessary when a new vector is added. Because of include file ordering problems, doing this necessitated the extraction of the AT_* symbols into a standalone header file. Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/sched.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'include/linux/sched.h') diff --git a/include/linux/sched.h b/include/linux/sched.h index 5fb31bede103..b5a22ea80045 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -35,6 +35,8 @@ #include #include +#include /* For AT_VECTOR_SIZE */ + struct exec_domain; /* @@ -261,7 +263,7 @@ struct mm_struct { mm_counter_t _rss; mm_counter_t _anon_rss; - unsigned long saved_auxv[42]; /* for /proc/PID/auxv */ + unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ unsigned dumpable:2; cpumask_t cpu_vm_mask; -- cgit v1.2.3 From 9c1cfda20a508b181bdda8c0045f7c0c333880a5 Mon Sep 17 00:00:00 2001 From: John Hawkes Date: Tue, 6 Sep 2005 15:18:14 -0700 Subject: [PATCH] cpusets: Move the ia64 domain setup code to the generic code Signed-off-by: John Hawkes Signed-off-by: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/sched.h | 7 ------- 1 file changed, 7 deletions(-) (limited to 'include/linux/sched.h') diff --git a/include/linux/sched.h b/include/linux/sched.h index b5a22ea80045..ea1b5f32ec5c 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -564,13 +564,6 @@ struct sched_domain { extern void partition_sched_domains(cpumask_t *partition1, cpumask_t *partition2); -#ifdef ARCH_HAS_SCHED_DOMAIN -/* Useful helpers that arch setup code may use. Defined in kernel/sched.c */ -extern cpumask_t cpu_isolated_map; -extern void init_sched_build_groups(struct sched_group groups[], - cpumask_t span, int (*group_fn)(int cpu)); -extern void cpu_attach_domain(struct sched_domain *sd, int cpu); -#endif /* ARCH_HAS_SCHED_DOMAIN */ #endif /* CONFIG_SMP */ -- cgit v1.2.3