sched/wait: Introduce TASK_NOLOAD and TASK_IDLE
Currently people use TASK_INTERRUPTIBLE to idle kthreads and wait for 'work' because TASK_UNINTERRUPTIBLE contributes to the loadavg. Having all idle kthreads contribute to the loadavg is somewhat silly. Now mostly this works OK, because kthreads have all their signals masked. However there's a few sites where this is causing problems and TASK_UNINTERRUPTIBLE should be used, except for that loadavg issue. This patch adds TASK_NOLOAD which, when combined with TASK_UNINTERRUPTIBLE avoids the loadavg accounting. As most of imagined usage sites are loops where a thread wants to idle, waiting for work, a helper TASK_IDLE is introduced. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Julian Anastasov <ja@ssi.bg> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: NeilBrown <neilb@suse.de> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -218,9 +218,10 @@ print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
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#define TASK_WAKEKILL 128
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#define TASK_WAKING 256
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#define TASK_PARKED 512
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#define TASK_STATE_MAX 1024
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#define TASK_NOLOAD 1024
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#define TASK_STATE_MAX 2048
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#define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWP"
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#define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWPN"
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extern char ___assert_task_state[1 - 2*!!(
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sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
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@ -230,6 +231,8 @@ extern char ___assert_task_state[1 - 2*!!(
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#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
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#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
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#define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD)
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/* Convenience macros for the sake of wake_up */
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#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
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#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
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@ -245,7 +248,8 @@ extern char ___assert_task_state[1 - 2*!!(
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((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
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#define task_contributes_to_load(task) \
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((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
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(task->flags & PF_FROZEN) == 0)
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(task->flags & PF_FROZEN) == 0 && \
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(task->state & TASK_NOLOAD) == 0)
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#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
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@ -147,7 +147,8 @@ TRACE_EVENT(sched_switch,
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__print_flags(__entry->prev_state & (TASK_STATE_MAX-1), "|",
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{ 1, "S"} , { 2, "D" }, { 4, "T" }, { 8, "t" },
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{ 16, "Z" }, { 32, "X" }, { 64, "x" },
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{ 128, "K" }, { 256, "W" }, { 512, "P" }) : "R",
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{ 128, "K" }, { 256, "W" }, { 512, "P" },
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{ 1024, "N" }) : "R",
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__entry->prev_state & TASK_STATE_MAX ? "+" : "",
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__entry->next_comm, __entry->next_pid, __entry->next_prio)
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);
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