linux-kernel - [PATCH] rcu: Report a quiescent state of TASKS

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Message-Id: <1526344426-31836-1-git-send-email-byungchul.park@lge.com>
Date:   Tue, 15 May 2018 09:33:46 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     jiangshanlai@...il.com, paulmck@...ux.vnet.ibm.com,
        josh@...htriplett.org, rostedt@...dmis.org,
        mathieu.desnoyers@...icios.com
Cc:     linux-kernel@...r.kernel.org, kernel-team@....com,
        joel@...lfernandes.org
Subject: [PATCH] rcu: Report a quiescent state of TASKS_RCU on a tick from user

Hello Paul,

You removed the reporing while simplifying the commit 508880df6 :)
Fold this patch onto the commit or add, whatever you want.

Thanks,
Byungchul

----->8-----
>From 18a2d8da3baf79d0edd5ccf94abe6f989da5b1c1 Mon Sep 17 00:00:00 2001
From: Byungchul Park <byungchul.park@....com>
Date: Tue, 15 May 2018 09:21:43 +0900
Subject: [PATCH] rcu: Report a quiescent state of TASKS_RCU on a tick from
 user

The reporting was removed while simplifying the commit 508880df6 (rcu:
Improve rcu_note_voluntary_context_switch() reporting). Add it back.

Signed-off-by: Byungchul Park <byungchul.park@....com>
---
 kernel/rcu/tiny.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c
index befc932..3345596 100644
--- a/kernel/rcu/tiny.c
+++ b/kernel/rcu/tiny.c
@@ -120,8 +120,10 @@ void rcu_bh_qs(void)
  */
 void rcu_check_callbacks(int user)
 {
-	if (user)
+	if (user) {
 		rcu_sched_qs();
+		rcu_tasks_qs();
+	}
 	if (user || !in_softirq())
 		rcu_bh_qs();
 }
-- 
1.9.1