linux-kernel - [PATCH v15 11/13] task_isolation: support CONFIG_TASK_ISOLATION

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Message-Id: <1471382376-5443-12-git-send-email-cmetcalf@mellanox.com>
Date:	Tue, 16 Aug 2016 17:19:34 -0400
From:	Chris Metcalf <cmetcalf@...lanox.com>
To:	Gilad Ben Yossef <giladb@...lanox.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Tejun Heo <tj@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Andy Lutomirski <luto@...capital.net>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Chris Metcalf <cmetcalf@...lanox.com>
Subject: [PATCH v15 11/13] task_isolation: support CONFIG_TASK_ISOLATION_ALL

This option, similar to NO_HZ_FULL_ALL, simplifies configuring
a system to boot by default with all cores except the boot core
running in task isolation mode.

Signed-off-by: Chris Metcalf <cmetcalf@...lanox.com>
---
 init/Kconfig       | 10 ++++++++++
 kernel/isolation.c |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/init/Kconfig b/init/Kconfig
index a95a35a31b46..a9b9c7635de2 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -813,6 +813,16 @@ config TASK_ISOLATION
 	 You should say "N" unless you are intending to run a
 	 high-performance userspace driver or similar task.
 
+config TASK_ISOLATION_ALL
+	bool "Provide task isolation on all CPUs by default (except CPU 0)"
+	depends on TASK_ISOLATION
+	help
+	 If the user doesn't pass the task_isolation boot option to
+	 define the range of task isolation CPUs, consider that all
+	 CPUs in the system are task isolation by default.
+	 Note the boot CPU will still be kept outside the range to
+	 handle timekeeping duty, etc.
+
 config BUILD_BIN2C
 	bool
 	default n
diff --git a/kernel/isolation.c b/kernel/isolation.c
index be7e95192e76..3dbb01ac503f 100644
--- a/kernel/isolation.c
+++ b/kernel/isolation.c
@@ -43,8 +43,14 @@ int __init task_isolation_init(void)
 {
 	/* For offstack cpumask, ensure we allocate an empty cpumask early. */
 	if (!saw_boot_arg) {
+#ifdef CONFIG_TASK_ISOLATION_ALL
+		alloc_cpumask_var(&task_isolation_map, GFP_KERNEL);
+		cpumask_copy(task_isolation_map, cpu_possible_mask);
+		cpumask_clear_cpu(smp_processor_id(), task_isolation_map);
+#else
 		zalloc_cpumask_var(&task_isolation_map, GFP_KERNEL);
 		return 0;
+#endif
 	}
 
 	/*
-- 
2.7.2