Commit-ID: 2c43838c99d9d23f17eb2bdadafcb2879cca6995 Gitweb: https://git.kernel.org/tip/2c43838c99d9d23f17eb2bdadafcb2879cca6995 Author: Frederic Weisbecker <frederic@xxxxxxxxxx> AuthorDate: Thu, 14 Dec 2017 19:18:26 +0100 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Mon, 18 Dec 2017 13:46:42 +0100 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@xxxxxxxxxx> Cc: Chris Metcalf <cmetcalf@xxxxxxxxxxxx> Cc: Christoph Lameter <cl@xxxxxxxxx> Cc: John Stultz <john.stultz@xxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Luiz Capitulino <lcapitulino@xxxxxxxxxx> Cc: Mike Galbraith <efault@xxxxxx> Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Wanpeng Li <kernellwp@xxxxxxxxx> Cc: kernel test robot <xiaolong.ye@xxxxxxxxx> Link: http://lkml.kernel.org/r/1513275507-29200-3-git-send-email-frederic@xxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- init/Kconfig | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/init/Kconfig b/init/Kconfig index 2934249..690a381 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" -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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