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[PATCH] SysRq-X: show blocked tasks

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Add SysRq-X support: show blocked (TASK_UNINTERRUPTIBLE) tasks only.

Useful for debugging IO stalls.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-12-06 20:35:59 -08:00 committed by Linus Torvalds
parent 875d95ec9e
commit e59e2ae2c2
3 changed files with 31 additions and 5 deletions
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14
drivers/char/sysrq.c
View file

@ -182,6 +182,18 @@ static struct sysrq_key_op sysrq_showstate_op = {
.enable_mask = SYSRQ_ENABLE_DUMP, .enable_mask = SYSRQ_ENABLE_DUMP,
}; };
static void sysrq_handle_showstate_blocked(int key, struct tty_struct *tty)
{
show_state_filter(TASK_UNINTERRUPTIBLE);
}
static struct sysrq_key_op sysrq_showstate_blocked_op = {
.handler = sysrq_handle_showstate_blocked,
.help_msg = "showBlockedTasks",
.action_msg = "Show Blocked State",
.enable_mask = SYSRQ_ENABLE_DUMP,
};
static void sysrq_handle_showmem(int key, struct tty_struct *tty) static void sysrq_handle_showmem(int key, struct tty_struct *tty)
{ {
show_mem(); show_mem();
@ -304,7 +316,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
/* May be assigned at init time by SMP VOYAGER */ /* May be assigned at init time by SMP VOYAGER */
NULL, /* v */ NULL, /* v */
NULL, /* w */ NULL, /* w */
NULL, /* x */ &sysrq_showstate_blocked_op, /* x */
NULL, /* y */ NULL, /* y */
NULL /* z */ NULL /* z */
}; };

11
include/linux/sched.h
View file

@ -194,7 +194,16 @@ extern void init_idle(struct task_struct *idle, int cpu);
extern cpumask_t nohz_cpu_mask; extern cpumask_t nohz_cpu_mask;
extern void show_state(void); /*
* Only dump TASK_* tasks. (-1 for all tasks)
*/
extern void show_state_filter(unsigned long state_filter);
static inline void show_state(void)
{
show_state_filter(-1);
}
extern void show_regs(struct pt_regs *); extern void show_regs(struct pt_regs *);
/* /*

11
kernel/sched.c
View file

@ -4804,7 +4804,7 @@ static void show_task(struct task_struct *p)
show_stack(p, NULL); show_stack(p, NULL);
} }
void show_state(void) void show_state_filter(unsigned long state_filter)
{ {
struct task_struct *g, *p; struct task_struct *g, *p;
@ -4824,11 +4824,16 @@ void show_state(void)
* console might take alot of time: * console might take alot of time:
*/ */
touch_nmi_watchdog(); touch_nmi_watchdog();
show_task(p); if (p->state & state_filter)
show_task(p);
} while_each_thread(g, p); } while_each_thread(g, p);
read_unlock(&tasklist_lock); read_unlock(&tasklist_lock);
debug_show_all_locks(); /*
* Only show locks if all tasks are dumped:
*/
if (state_filter == -1)
debug_show_all_locks();
} }
/** /**