2020-10-12 12:52:06 +00:00
|
|
|
From 826426c0daabf1e601bbe81b30be496da4248e89 Mon Sep 17 00:00:00 2001
|
|
|
|
|
Message-Id: <826426c0daabf1e601bbe81b30be496da4248e89.1601675151.git.zanussi@kernel.org>
|
|
|
|
|
In-Reply-To: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
|
|
|
|
|
References: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
|
2019-04-08 23:49:20 +00:00
|
|
|
From: "Paul E. McKenney" <paulmck@linux.ibm.com>
|
2018-10-30 12:40:05 +00:00
|
|
|
Date: Mon, 29 Oct 2018 11:53:01 +0100
|
2020-09-04 20:10:21 +00:00
|
|
|
Subject: [PATCH 023/333] EXP rcu: Revert expedited GP parallelization
|
2019-04-08 23:49:20 +00:00
|
|
|
cleverness
|
2020-10-12 12:52:06 +00:00
|
|
|
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.148-rt64.tar.xz
|
2018-10-30 12:40:05 +00:00
|
|
|
|
|
|
|
|
(Commit 258ba8e089db23f760139266c232f01bad73f85c from linux-rcu)
|
|
|
|
|
|
|
|
|
|
This commit reverts a series of commits starting with fcc635436501 ("rcu:
|
|
|
|
|
Make expedited GPs handle CPU 0 being offline") and its successors, thus
|
|
|
|
|
queueing each rcu_node structure's expedited grace-period initialization
|
|
|
|
|
work on the first CPU of that rcu_node structure.
|
|
|
|
|
|
|
|
|
|
Suggested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
|
|
|
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
|
|
|
|
|
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
|
|
|
---
|
2019-04-08 23:49:20 +00:00
|
|
|
kernel/rcu/tree_exp.h | 9 +--------
|
2018-10-30 12:40:05 +00:00
|
|
|
1 file changed, 1 insertion(+), 8 deletions(-)
|
|
|
|
|
|
2019-04-08 23:49:20 +00:00
|
|
|
diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
|
|
|
|
|
index 0b2c2ad69629..a0486414edb4 100644
|
2018-10-30 12:40:05 +00:00
|
|
|
--- a/kernel/rcu/tree_exp.h
|
|
|
|
|
+++ b/kernel/rcu/tree_exp.h
|
2019-04-08 23:49:20 +00:00
|
|
|
@@ -472,7 +472,6 @@ static void sync_rcu_exp_select_node_cpus(struct work_struct *wp)
|
2018-10-30 12:40:05 +00:00
|
|
|
static void sync_rcu_exp_select_cpus(struct rcu_state *rsp,
|
|
|
|
|
smp_call_func_t func)
|
|
|
|
|
{
|
|
|
|
|
- int cpu;
|
|
|
|
|
struct rcu_node *rnp;
|
|
|
|
|
|
|
|
|
|
trace_rcu_exp_grace_period(rsp->name, rcu_exp_gp_seq_endval(rsp), TPS("reset"));
|
2019-04-08 23:49:20 +00:00
|
|
|
@@ -494,13 +493,7 @@ static void sync_rcu_exp_select_cpus(struct rcu_state *rsp,
|
2018-10-30 12:40:05 +00:00
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
INIT_WORK(&rnp->rew.rew_work, sync_rcu_exp_select_node_cpus);
|
|
|
|
|
- preempt_disable();
|
|
|
|
|
- cpu = cpumask_next(rnp->grplo - 1, cpu_online_mask);
|
|
|
|
|
- /* If all offline, queue the work on an unbound CPU. */
|
|
|
|
|
- if (unlikely(cpu > rnp->grphi))
|
|
|
|
|
- cpu = WORK_CPU_UNBOUND;
|
|
|
|
|
- queue_work_on(cpu, rcu_par_gp_wq, &rnp->rew.rew_work);
|
|
|
|
|
- preempt_enable();
|
|
|
|
|
+ queue_work_on(rnp->grplo, rcu_par_gp_wq, &rnp->rew.rew_work);
|
|
|
|
|
rnp->exp_need_flush = true;
|
|
|
|
|
}
|
|
|
|
|
|
2020-01-03 23:36:11 +00:00
|
|
|
--
|
2020-06-22 13:14:16 +00:00
|
|
|
2.17.1
|
2020-01-03 23:36:11 +00:00
|
|
|
|
