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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-06-24 21:20:08 (GMT) |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-07-17 21:58:48 (GMT) |
| commit | 385b73c06f6a733547d0a7714d0c4cb4c8788b88 (patch) | |
| tree | e3131e0f720dc99d764ea23c50c80dee1f05e796 /kernel/rcu/tree_trace.c | |
| parent | d6ada2cf2f81dab8a231d0ef8fb5dec4f5ac8379 (diff) | |
| download | linux-385b73c06f6a733547d0a7714d0c4cb4c8788b88.tar.xz | |
rcu: Get rid of synchronize_sched_expedited()'s polling loop
This commit gets rid of synchronize_sched_expedited()'s mutex_trylock()
polling loop in favor of a funnel-locking scheme based on the rcu_node
tree. The work-done check is done at each level of the tree, allowing
high-contention situations to be resolved quickly with reasonable levels
of mutex contention.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/tree_trace.c')
| -rw-r--r-- | kernel/rcu/tree_trace.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/rcu/tree_trace.c b/kernel/rcu/tree_trace.c index a1ab3a5..d2aab8d 100644 --- a/kernel/rcu/tree_trace.c +++ b/kernel/rcu/tree_trace.c @@ -185,12 +185,11 @@ static int show_rcuexp(struct seq_file *m, void *v) { struct rcu_state *rsp = (struct rcu_state *)m->private; - seq_printf(m, "t=%lu tf=%lu wd1=%lu wd2=%lu wd3=%lu n=%lu sc=%lu\n", + seq_printf(m, "t=%lu tf=%lu wd1=%lu wd2=%lu n=%lu sc=%lu\n", rsp->expedited_sequence, atomic_long_read(&rsp->expedited_tryfail), atomic_long_read(&rsp->expedited_workdone1), atomic_long_read(&rsp->expedited_workdone2), - rsp->expedited_workdone3, atomic_long_read(&rsp->expedited_normal), rsp->expedited_sequence / 2); return 0; |