From: Chris Metcalf <cmetcalf@mellanox.com>
To: Gilad Ben Yossef <giladb@ezchip.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Rik van Riel" <riel@redhat.com>, Tejun Heo <tj@kernel.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Christoph Lameter <cl@linux.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Andy Lutomirski <luto@amacapital.net>,
<linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Subject: [PATCH v11 05/13] task_isolation: support CONFIG_TASK_ISOLATION_ALL
Date: Fri, 11 Mar 2016 17:10:15 -0500 [thread overview]
Message-ID: <1457734223-26209-6-git-send-email-cmetcalf@mellanox.com> (raw)
In-Reply-To: <1457734223-26209-1-git-send-email-cmetcalf@mellanox.com>
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@mellanox.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
next prev parent reply other threads:[~2016-03-11 22:27 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-11 22:10 [PATCH v11 00/13] support "task_isolation" mode Chris Metcalf
2016-03-11 22:10 ` [PATCH v11 01/13] vmstat: add quiet_vmstat_sync function Chris Metcalf
2016-03-21 14:34 ` Michal Hocko
2016-03-21 15:44 ` Chris Metcalf
2016-03-11 22:10 ` [PATCH v11 02/13] vmstat: add vmstat_idle function Chris Metcalf
2016-03-11 22:10 ` [PATCH v11 03/13] lru_add_drain_all: factor out lru_add_drain_needed Chris Metcalf
2016-03-11 22:10 ` [PATCH v11 04/13] task_isolation: add initial support Chris Metcalf
2016-03-11 22:10 ` Chris Metcalf [this message]
2016-03-11 22:10 ` [PATCH v11 06/13] task_isolation: support PR_TASK_ISOLATION_STRICT mode Chris Metcalf
2016-03-11 22:10 ` [PATCH v11 07/13] task_isolation: add debug boot flag Chris Metcalf
2016-03-11 22:10 ` [PATCH v11 08/13] task_isolation: add PR_TASK_ISOLATION_ONE_SHOT flag Chris Metcalf
2016-03-11 22:10 ` [PATCH v11 09/13] arm, tile: turn off timer tick for oneshot_stopped state Chris Metcalf
2016-03-11 22:10 ` [PATCH v11 10/13] arch/x86: enable task isolation functionality Chris Metcalf
2016-03-11 22:10 ` [PATCH v11 11/13] arch/tile: " Chris Metcalf
2016-03-11 22:10 ` [PATCH v11 12/13] arm64: factor work_pending state machine to C Chris Metcalf
2016-03-16 18:19 ` Chris Metcalf
2016-03-11 22:10 ` [PATCH v11 13/13] arch/arm64: enable task isolation functionality Chris Metcalf
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