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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ingo Molnar 2006-12-06 20:35:59 -08:00 • committed by Linus Torvalds
commit e59e2ae2c2
3 changed files with 31 additions and 5 deletions
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14
drivers/char/sysrq.c
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@ -182,6 +182,18 @@ static struct sysrq_key_op sysrq_showstate_op = {
.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)
{
show_mem();
@ -304,7 +316,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
/* May be assigned at init time by SMP VOYAGER */
NULL, /* v */
NULL, /* w */
NULL, /* x */
&sysrq_showstate_blocked_op, /* x */
NULL, /* y */
NULL /* z */
};