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From: tip-bot for Frederic Weisbecker <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: paulmck@linux.vnet.ibm.com, peterz@infradead.org,
	kernellwp@gmail.com, cmetcalf@mellanox.com, riel@redhat.com,
	tglx@linutronix.de, torvalds@linux-foundation.org, cl@linux.com,
	efault@gmx.de, linux-kernel@vger.kernel.org, mingo@kernel.org,
	frederic@kernel.org, lcapitulino@redhat.com, hpa@zytor.com
Subject: [tip:sched/core] sched/isolation: Provide a dynamic off-case to housekeeping_any_cpu()
Date: Fri, 27 Oct 2017 05:02:37 -0700	[thread overview]
Message-ID: <tip-9f0ca2d97ef0b5e966be2cfef26c7c094ec14e41@git.kernel.org> (raw)
In-Reply-To: <1509072159-31808-4-git-send-email-frederic@kernel.org>

Commit-ID:  9f0ca2d97ef0b5e966be2cfef26c7c094ec14e41
Gitweb:     https://git.kernel.org/tip/9f0ca2d97ef0b5e966be2cfef26c7c094ec14e41
Author:     Frederic Weisbecker <frederic@kernel.org>
AuthorDate: Fri, 27 Oct 2017 04:42:30 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 27 Oct 2017 09:55:26 +0200

sched/isolation: Provide a dynamic off-case to housekeeping_any_cpu()

housekeeping_any_cpu() doesn't handle correctly the case where
CONFIG_NO_HZ_FULL=y and no CPU is in nohz_full mode. So far no caller
needs this but let's prepare to avoid any future surprise.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Wanpeng Li <kernellwp@gmail.com>
Link: http://lkml.kernel.org/r/1509072159-31808-4-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 include/linux/sched/isolation.h | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
index b7cfbc4..040df04 100644
--- a/include/linux/sched/isolation.h
+++ b/include/linux/sched/isolation.h
@@ -7,25 +7,20 @@
 
 #ifdef CONFIG_NO_HZ_FULL
 extern cpumask_var_t housekeeping_mask;
-
-static inline int housekeeping_any_cpu(void)
-{
-	return cpumask_any_and(housekeeping_mask, cpu_online_mask);
-}
-
 extern void __init housekeeping_init(void);
-
 #else
+static inline void housekeeping_init(void) { }
+#endif /* CONFIG_NO_HZ_FULL */
 
 static inline int housekeeping_any_cpu(void)
 {
+#ifdef CONFIG_NO_HZ_FULL
+	if (tick_nohz_full_enabled())
+		return cpumask_any_and(housekeeping_mask, cpu_online_mask);
+#endif
 	return smp_processor_id();
 }
 
-static inline void housekeeping_init(void) { }
-#endif /* CONFIG_NO_HZ_FULL */
-
-
 static inline const struct cpumask *housekeeping_cpumask(void)
 {
 #ifdef CONFIG_NO_HZ_FULL

  reply	other threads:[~2017-10-27 12:08 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-27  2:42 [GIT PULL] Housekeeping subsystem v6 Frederic Weisbecker
2017-10-27  2:42 ` [PATCH 01/12] housekeeping: Move housekeeping related code to its own file Frederic Weisbecker
2017-10-27 12:01   ` [tip:sched/core] sched/isolation: " tip-bot for Frederic Weisbecker
2017-10-27  2:42 ` [PATCH 02/12] watchdog: Use housekeeping_cpumask() instead of ad-hoc version Frederic Weisbecker
2017-10-27 12:02   ` [tip:sched/core] sched/isolation, " tip-bot for Frederic Weisbecker
2017-10-27  2:42 ` [PATCH 03/12] housekeeping: Provide a dynamic off-case to housekeeping_any_cpu() Frederic Weisbecker
2017-10-27 12:02   ` tip-bot for Frederic Weisbecker [this message]
2017-10-27  2:42 ` [PATCH 04/12] housekeeping: Make housekeeping cpumask private Frederic Weisbecker
2017-10-27 12:03   ` [tip:sched/core] sched/isolation: Make the " tip-bot for Frederic Weisbecker
2017-10-27  2:42 ` [PATCH 05/12] housekeeping: Use its own static key Frederic Weisbecker
2017-10-27 12:03   ` [tip:sched/core] sched/isolation: " tip-bot for Frederic Weisbecker
2017-10-27  2:42 ` [PATCH 06/12] housekeeping: Rename is_housekeeping_cpu to housekeeping_cpu Frederic Weisbecker
2017-10-27 12:03   ` [tip:sched/core] sched/isolation: Rename is_housekeeping_cpu() to housekeeping_cpu() tip-bot for Frederic Weisbecker
2017-10-27  2:42 ` [PATCH 07/12] housekeeping: Move it under its own config, independent from NO_HZ Frederic Weisbecker
2017-10-27 12:04   ` [tip:sched/core] sched/isolation: Split out new CONFIG_CPU_ISOLATION=y config from CONFIG_NO_HZ_FULL tip-bot for Frederic Weisbecker
2017-10-27  2:42 ` [PATCH 08/12] housekeeping: Introduce housekeeping flags Frederic Weisbecker
2017-10-27 12:04   ` [tip:sched/core] sched/isolation: " tip-bot for Frederic Weisbecker
2017-10-27  2:42 ` [PATCH 09/12] housekeeping: Handle the nohz_full= parameter Frederic Weisbecker
2017-10-27 12:05   ` [tip:sched/core] sched/isolation: " tip-bot for Frederic Weisbecker
2017-10-27  2:42 ` [PATCH 10/12] housekeeping: Move isolcpus to housekeeping Frederic Weisbecker
2017-10-27 12:05   ` [tip:sched/core] sched/isolation: Move isolcpus= handling to the housekeeping code tip-bot for Frederic Weisbecker
2017-10-27  2:42 ` [PATCH 11/12] housekeeping: Add basic isolcpus flags Frederic Weisbecker
2017-10-27 12:05   ` [tip:sched/core] sched/isolation: " tip-bot for Frederic Weisbecker
2017-10-27  2:42 ` [PATCH 12/12] housekeeping: Document " Frederic Weisbecker
2017-10-27 12:06   ` [tip:sched/core] sched/isolation: Document the isolcpus= flags tip-bot for Frederic Weisbecker
2017-10-27 13:58     ` Peter Zijlstra
2017-10-27 14:36       ` Frederic Weisbecker
2017-10-27 17:06         ` Ingo Molnar
2017-10-27 17:33           ` Frederic Weisbecker
2017-10-27 18:21             ` Ingo Molnar
2017-10-27 18:39               ` Frederic Weisbecker
2017-10-27 19:04                 ` Ingo Molnar
2017-10-27 14:38       ` Mike Galbraith
2017-10-30 15:48       ` Christopher Lameter
2017-10-30 16:11         ` Peter Zijlstra
2017-10-30 16:30           ` Christopher Lameter
2017-10-30 16:58             ` Peter Zijlstra
2017-10-30 16:56           ` Mike Galbraith

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