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| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-04-11 15:50:41 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-04-21 05:59:27 -0700 |
| commit | bcbfdd01dce5556a952fae84ef16fd0f12525e7b (patch) | |
| tree | d674b23e7a573c6e5234acb5e914fc60e581594a /kernel/sched/core.c | |
| parent | srcu: Expedite srcu_schedule_cbs_snp() callback invocation (diff) | |
| download | linux-dev-bcbfdd01dce5556a952fae84ef16fd0f12525e7b.tar.xz linux-dev-bcbfdd01dce5556a952fae84ef16fd0f12525e7b.zip | |
rcu: Make non-preemptive schedule be Tasks RCU quiescent state
Currently, a call to schedule() acts as a Tasks RCU quiescent state
only if a context switch actually takes place. However, just the
call to schedule() guarantees that the calling task has moved off of
whatever tracing trampoline that it might have been one previously.
This commit therefore plumbs schedule()'s "preempt" parameter into
rcu_note_context_switch(), which then records the Tasks RCU quiescent
state, but only if this call to schedule() was -not- due to a preemption.
To avoid adding overhead to the common-case context-switch path,
this commit hides the rcu_note_context_switch() check under an existing
non-common-case check.
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/sched/core.c')
| -rw-r--r-- | kernel/sched/core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 3b31fc05a0f1..2adf7b6c04e7 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3378,7 +3378,7 @@ static void __sched notrace __schedule(bool preempt) hrtick_clear(rq); local_irq_disable(); - rcu_note_context_switch(); + rcu_note_context_switch(preempt); /* * Make sure that signal_pending_state()->signal_pending() below |