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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2016-11-25 00:07:23 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-01-23 11:37:12 -0800
commitb201fa67371862229f27a1f022196423aa5c7381 (patch)
tree5d8e2ae59519ae808a1ffc8929c925ed96942369 /kernel/rcu
parent28053bc72c0e588c577557ce9e95a6cb65078471 (diff)
downloadlinux-b201fa67371862229f27a1f022196423aa5c7381.tar.bz2
rcu: Remove short-term CPU kicking
Commit 4914950aaa12d ("rcu: Stop treating in-kernel CPU-bound workloads as errors") added a (relatively) short-timeout call to resched_cpu(). This was inspired by as issue that was fixed by b7e7ade34e61 ("sched/core: Fix remote wakeups"). But given that this issue was fixed, it is time for the current commit to remove this call to resched_cpu(). Reported-by: Byungchul Park <byungchul.park@lge.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 0e61b62e3f4a..5a4aaad75e76 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1220,11 +1220,6 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp,
rdp->rsp->jiffies_resched += 5; /* Re-enable beating. */
}
- /* And if it has been a really long time, kick the CPU as well. */
- if (ULONG_CMP_GE(jiffies,
- rdp->rsp->gp_start + 2 * jiffies_till_sched_qs) ||
- ULONG_CMP_GE(jiffies, rdp->rsp->gp_start + jiffies_till_sched_qs))
- resched_cpu(rdp->cpu); /* Force CPU into scheduler. */
/*
* If more than halfway to RCU CPU stall-warning time, do
* a resched_cpu() to try to loosen things up a bit.