diff options
| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-07-29 14:50:47 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-09-07 16:18:17 -0700 |
| commit | 9fdd3bc9005824704f9802bec7b3e06f5edae434 (patch) | |
| tree | 94433c52525a23ecb250aa155130cdd0753d4404 /include/trace | |
| parent | rcu: Remove stale comment in tree.c (diff) | |
| download | linux-dev-9fdd3bc9005824704f9802bec7b3e06f5edae434.tar.xz linux-dev-9fdd3bc9005824704f9802bec7b3e06f5edae434.zip | |
rcu: Break more call_rcu() deadlock involving scheduler and perf
Commit 96d3fd0d315a9 (rcu: Break call_rcu() deadlock involving scheduler
and perf) covered the case where __call_rcu_nocb_enqueue() needs to wake
the rcuo kthread due to the queue being initially empty, but did not
do anything for the case where the queue was overflowing. This commit
therefore also defers wakeup for the overflow case.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/trace')
| -rw-r--r-- | include/trace/events/rcu.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h index aca382266411..9b56f37148cf 100644 --- a/include/trace/events/rcu.h +++ b/include/trace/events/rcu.h @@ -180,9 +180,12 @@ TRACE_EVENT(rcu_grace_period_init, * argument is a string as follows: * * "WakeEmpty": Wake rcuo kthread, first CB to empty list. + * "WakeEmptyIsDeferred": Wake rcuo kthread later, first CB to empty list. * "WakeOvf": Wake rcuo kthread, CB list is huge. + * "WakeOvfIsDeferred": Wake rcuo kthread later, CB list is huge. * "WakeNot": Don't wake rcuo kthread. * "WakeNotPoll": Don't wake rcuo kthread because it is polling. + * "DeferredWake": Carried out the "IsDeferred" wakeup. * "Poll": Start of new polling cycle for rcu_nocb_poll. * "Sleep": Sleep waiting for CBs for !rcu_nocb_poll. * "WokeEmpty": rcuo kthread woke to find empty list. |