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authorFrederic Weisbecker <frederic@kernel.org>2017-12-14 19:18:26 +0100
committerIngo Molnar <mingo@kernel.org>2017-12-18 13:46:42 +0100
commit2c43838c99d9d23f17eb2bdadafcb2879cca6995 (patch)
treeef7ad23f77fc77258a266434e797dfbd7e0c1e8d /init
parentbf29cb238dc0656e6564b6a94bb82e11d2129437 (diff)
downloadlinux-2c43838c99d9d23f17eb2bdadafcb2879cca6995.tar.bz2
sched/isolation: Enable CONFIG_CPU_ISOLATION=y by default
The "isolcpus=" boot parameter support was always built-in before we moved the related code under CONFIG_CPU_ISOLATION. Having it disabled by default is very confusing for people accustomed to use this parameter. So enable it by dafault to keep the previous behaviour but keep it optable for those who want to tinify their kernels. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: Christoph Lameter <cl@linux.com> Cc: John Stultz <john.stultz@linaro.org> 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: Thomas Gleixner <tglx@linutronix.de> Cc: Wanpeng Li <kernellwp@gmail.com> Cc: kernel test robot <xiaolong.ye@intel.com> Link: http://lkml.kernel.org/r/1513275507-29200-3-git-send-email-frederic@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'init')
-rw-r--r--init/Kconfig6
1 files changed, 5 insertions, 1 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 2934249fba46..690a381adee0 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -461,10 +461,14 @@ endmenu # "CPU/Task time and stats accounting"
config CPU_ISOLATION
bool "CPU isolation"
+ default y
help
Make sure that CPUs running critical tasks are not disturbed by
any source of "noise" such as unbound workqueues, timers, kthreads...
- Unbound jobs get offloaded to housekeeping CPUs.
+ Unbound jobs get offloaded to housekeeping CPUs. This is driven by
+ the "isolcpus=" boot parameter.
+
+ Say Y if unsure.
source "kernel/rcu/Kconfig"