From: Paul E. McKenney <paulmck@kernel.org>
Date: Thu, 7 May 2020 23:38:29 +0000 (-0700)
Subject: rcu: Expedited grace-period sleeps to idle priority
X-Git-Tag: howlett/maple_spf/20210104~1405^2^2^2~13
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=68c2f27e01f61760e6ae76fff9682e1ffe9bacb6;p=users%2Fjedix%2Flinux-maple.git

rcu: Expedited grace-period sleeps to idle priority

This commit converts the schedule_timeout_uninterruptible() call used
by RCU's expedited grace-period processing to schedule_timeout_idle().
This conversion avoids polluting the load-average with RCU-related
sleeping.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---

diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index 72952edad1e4b..1888c0eb12160 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -403,7 +403,7 @@ retry_ipi:
 			/* Online, so delay for a bit and try again. */
 			raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
 			trace_rcu_exp_grace_period(rcu_state.name, rcu_exp_gp_seq_endval(), TPS("selectofl"));
-			schedule_timeout_uninterruptible(1);
+			schedule_timeout_idle(1);
 			goto retry_ipi;
 		}
 		/* CPU really is offline, so we must report its QS. */