sched/debug: Add explicit TASK_PARKED printing

Currently TASK_PARKED is masqueraded as TASK_INTERRUPTIBLE, give it
its own print state because it will not in fact get woken by regular
wakeups and is a long-term state.

This requires moving TASK_PARKED into the TASK_REPORT mask, and since
that latter needs to be a contiguous bitmask, we need to shuffle the
bits around a bit.

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>

diff --git a/fs/proc/array.c b/fs/proc/array.c
index a120a45..77a8eac 100644 (file)
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -128,9 +128,10 @@ static const char * const task_state_array[] = {
        "t (tracing stop)",     /* 0x08 */
        "X (dead)",             /* 0x10 */
        "Z (zombie)",           /* 0x20 */
+       "P (parked)",           /* 0x40 */
 
        /* states beyond TASK_REPORT: */
-       "I (idle)",             /* 0x40 */
+       "I (idle)",             /* 0x80 */
 };
 
 static inline const char *get_task_state(struct task_struct *tsk)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 286fc11..26a7df4 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -75,10 +75,10 @@ struct task_group;
 #define EXIT_ZOMBIE                    0x0020
 #define EXIT_TRACE                     (EXIT_ZOMBIE | EXIT_DEAD)
 /* Used in tsk->state again: */
-#define TASK_DEAD                      0x0040
-#define TASK_WAKEKILL                  0x0080
-#define TASK_WAKING                    0x0100
-#define TASK_PARKED                    0x0200
+#define TASK_PARKED                    0x0040
+#define TASK_DEAD                      0x0080
+#define TASK_WAKEKILL                  0x0100
+#define TASK_WAKING                    0x0200
 #define TASK_NOLOAD                    0x0400
 #define TASK_NEW                       0x0800
 #define TASK_STATE_MAX                 0x1000
@@ -97,7 +97,8 @@ struct task_group;
 /* get_task_state(): */
 #define TASK_REPORT                    (TASK_RUNNING | TASK_INTERRUPTIBLE | \
                                         TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
-                                        __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE)
+                                        __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \
+                                        TASK_PARKED)
 
 #define task_is_traced(task)           ((task->state & __TASK_TRACED) != 0)
 
@@ -1251,9 +1252,6 @@ static inline unsigned int __get_task_state(struct task_struct *tsk)
 
        BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX);
 
-       if (tsk_state == TASK_PARKED)
-               state = TASK_INTERRUPTIBLE;
-
        if (tsk_state == TASK_IDLE)
                state = TASK_REPORT_IDLE;
 
@@ -1262,7 +1260,7 @@ static inline unsigned int __get_task_state(struct task_struct *tsk)
 
 static inline char __task_state_to_char(unsigned int state)
 {
-       static const char state_char[] = "RSDTtXZI";
+       static const char state_char[] = "RSDTtXZPI";
 
        BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1);
 

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index b371ef8..3c8b7f6 100644 (file)
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -160,7 +160,7 @@ TRACE_EVENT(sched_switch,
                  __print_flags(__entry->prev_state & (TASK_REPORT_MAX - 1), "|",
                                { 0x01, "S" }, { 0x02, "D" }, { 0x04, "T" },
                                { 0x08, "t" }, { 0x10, "X" }, { 0x20, "Z" },
-                               { 0x40, "I" }) :
+                               { 0x40, "P" }, { 0x80, "I" }) :
                  "R",
 
                __entry->prev_state & TASK_STATE_MAX ? "+" : "",