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sched/debug: Intruduce task_state_to_char() helper function

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Now that we have more than one place to get the task state,
intruduce the task_state_to_char() helper function to save some code.

No functionality changed.

Signed-off-by: Xie XiuQi <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Xie XiuQi 2017-08-07 16:44:23 +08:00 • committed by Ingo Molnar
commit 20435d84e5
3 changed files with 20 additions and 18 deletions
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15
kernel/sched/core.c
View file

@ -5103,24 +5103,17 @@ out_unlock:
return retval;
}
static const char stat_nam[] = TASK_STATE_TO_CHAR_STR;
void sched_show_task(struct task_struct *p)
{
unsigned long free = 0;
int ppid;
unsigned long state = p->state;
/* Make sure the string lines up properly with the number of task states: */
BUILD_BUG_ON(sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1);
if (!try_get_task_stack(p))
return;
if (state)
state = __ffs(state) + 1;
printk(KERN_INFO "%-15.15s %c", p->comm,
state < sizeof(stat_nam) - 1 ? stat_nam[state] : '?');
if (state == TASK_RUNNING)
printk(KERN_INFO "%-15.15s %c", p->comm, task_state_to_char(p));
if (p->state == TASK_RUNNING)
printk(KERN_CONT " running task ");
#ifdef CONFIG_DEBUG_STACK_USAGE
free = stack_not_used(p);

10
kernel/sched/debug.c
View file

@ -426,14 +426,10 @@ static const char stat_nam[] = TASK_STATE_TO_CHAR_STR;
static void
print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
{
unsigned long state;
if (rq->curr == p) {
if (rq->curr == p)
SEQ_printf(m, ">R");
} else {
state = p->state ? __ffs(p->state) + 1 : 0;
SEQ_printf(m, " %c", state < sizeof(stat_nam) - 1 ? stat_nam[state] : '?');
}
else
SEQ_printf(m, " %c", task_state_to_char(p));
SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
p->comm, task_pid_nr(p),