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| author | Peter Zijlstra <peterz@infradead.org> | 2017-09-22 19:09:26 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-09-29 11:09:08 +0300 |
| commit | 1593baab910da72480d651ea7bf2ce6e3a25a484 (patch) | |
| tree | f25d6f915062f9c322233c987d30a66260f474bb /include/linux | |
| parent | 770b782f555d663d133fcd4dc1632023f79357b9 (diff) | |
| download | linux-1593baab910da72480d651ea7bf2ce6e3a25a484.tar.xz | |
sched/debug: Implement consistent task-state printing
Currently get_task_state() and task_state_to_char() report different
states, create a number of common helpers and unify the reported state
space.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/sched.h | 26 |
1 files changed, 19 insertions, 7 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 92fb8dd5a9e4..163a0b738908 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1243,17 +1243,29 @@ static inline pid_t task_pgrp_nr(struct task_struct *tsk) return task_pgrp_nr_ns(tsk, &init_pid_ns); } -static inline char task_state_to_char(struct task_struct *task) +static inline unsigned int __get_task_state(struct task_struct *tsk) { - const char stat_nam[] = TASK_STATE_TO_CHAR_STR; - unsigned long state = task->state; + unsigned int tsk_state = READ_ONCE(tsk->state); + unsigned int state = (tsk_state | tsk->exit_state) & TASK_REPORT; - state = state ? __ffs(state) + 1 : 0; + if (tsk_state == TASK_PARKED) + state = TASK_INTERRUPTIBLE; - /* 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); + return fls(state); +} + +static inline char __task_state_to_char(unsigned int state) +{ + static const char state_char[] = "RSDTtXZ"; + + BUILD_BUG_ON(1 + ilog2(TASK_REPORT) != sizeof(state_char) - 2); - return state < sizeof(stat_nam) - 1 ? stat_nam[state] : '?'; + return state_char[state]; +} + +static inline char task_state_to_char(struct task_struct *tsk) +{ + return __task_state_to_char(__get_task_state(tsk)); } /** |