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Message-ID: <1457734223-26209-6-git-send-email-cmetcalf@mellanox.com>
Date: Fri, 11 Mar 2016 17:10:15 -0500
From: Chris Metcalf <cmetcalf@...lanox.com>
To: Gilad Ben Yossef <giladb@...hip.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 v11 05/13] 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 6cab348fe454..314b09347fba 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -802,6 +802,16 @@ 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 c67f77d217f9..f59dcf06ba56 100644
--- a/kernel/isolation.c
+++ b/kernel/isolation.c
@@ -40,8 +40,14 @@ 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
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