Commit-ID: 59e334ed3d8cbf7d1f0180690f072d0043fb9e24 Gitweb: https://git.kernel.org/tip/59e334ed3d8cbf7d1f0180690f072d0043fb9e24 Author: Frederic Weisbecker <frede...@kernel.org> AuthorDate: Tue, 24 Oct 2017 15:06:56 +0200 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Tue, 24 Oct 2017 15:20:15 +0200
housekeeping: Move it under its own config, independent from NO_HZ Split housekeeping config from CONFIG_NO_HZ_FULL. This way we finally separate the isolation code from nohz. Although a dependency to CONFIG_NO_HZ_FULL remains for now until the housekeeping code doesn't deal anymore with nohz internals directly. Signed-off-by: Frederic Weisbecker <frede...@kernel.org> Cc: Chris Metcalf <cmetc...@mellanox.com> Cc: Christoph Lameter <c...@linux.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Luiz Capitulino <lcapitul...@redhat.com> Cc: Mike Galbraith <efa...@gmx.de> Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Rik van Riel <r...@redhat.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Wanpeng Li <kernel...@gmail.com> Link: http://lkml.kernel.org/r/1508850421-10058-8-git-send-email-frede...@kernel.org Signed-off-by: Ingo Molnar <mi...@kernel.org> --- include/linux/housekeeping.h | 6 +++--- init/Kconfig | 8 ++++++++ kernel/Makefile | 2 +- 3 files changed, 12 insertions(+), 4 deletions(-) diff --git a/include/linux/housekeeping.h b/include/linux/housekeeping.h index 320cc2b..dcbec47 100644 --- a/include/linux/housekeeping.h +++ b/include/linux/housekeeping.h @@ -5,7 +5,7 @@ #include <linux/init.h> #include <linux/tick.h> -#ifdef CONFIG_NO_HZ_FULL +#ifdef CONFIG_CPU_ISOLATION DECLARE_STATIC_KEY_FALSE(housekeeping_overriden); extern int housekeeping_any_cpu(void); extern const struct cpumask *housekeeping_cpumask(void); @@ -27,11 +27,11 @@ static inline const struct cpumask *housekeeping_cpumask(void) static inline void housekeeping_affine(struct task_struct *t) { } static inline void housekeeping_init(void) { } -#endif /* CONFIG_NO_HZ_FULL */ +#endif /* CONFIG_CPU_ISOLATION */ static inline bool housekeeping_cpu(int cpu) { -#ifdef CONFIG_NO_HZ_FULL +#ifdef CONFIG_CPU_ISOLATION if (static_branch_unlikely(&housekeeping_overriden)) return housekeeping_test_cpu(cpu); #endif diff --git a/init/Kconfig b/init/Kconfig index 78cb246..6f52e6f 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -472,6 +472,14 @@ config TASK_IO_ACCOUNTING endmenu # "CPU/Task time and stats accounting" +config CPU_ISOLATION + bool "CPU isolation" + depends on NO_HZ_FULL + 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. + source "kernel/rcu/Kconfig" config BUILD_BIN2C diff --git a/kernel/Makefile b/kernel/Makefile index c63f893..5b01feb 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -109,7 +109,7 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o obj-$(CONFIG_JUMP_LABEL) += jump_label.o obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o obj-$(CONFIG_TORTURE_TEST) += torture.o -obj-$(CONFIG_NO_HZ_FULL) += housekeeping.o +obj-$(CONFIG_CPU_ISOLATION) += housekeeping.o obj-$(CONFIG_HAS_IOMEM) += memremap.o
