diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2015-05-08 14:23:45 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 08:39:18 +0200 |
| commit | 80ed87c8a9ca0cad7ca66cf3bbdfb17559a66dcf (patch) | |
| tree | 7da247bcde968e1ee6900dde15c875a44d145e3b /include/trace | |
| parent | 8222dbe21e79338de92d5e1956cd1e3994cc9f93 (diff) | |
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>
Diffstat (limited to 'include/trace')
| -rw-r--r-- | include/trace/events/sched.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index 30fedaf3e56a..d57a575fe31f 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -147,7 +147,8 @@ TRACE_EVENT(sched_switch, __print_flags(__entry->prev_state & (TASK_STATE_MAX-1), "|", { 1, "S"} , { 2, "D" }, { 4, "T" }, { 8, "t" }, { 16, "Z" }, { 32, "X" }, { 64, "x" }, - { 128, "K" }, { 256, "W" }, { 512, "P" }) : "R", + { 128, "K" }, { 256, "W" }, { 512, "P" }, + { 1024, "N" }) : "R", __entry->prev_state & TASK_STATE_MAX ? "+" : "", __entry->next_comm, __entry->next_pid, __entry->next_prio) ); |