lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Wed, 23 Aug 2017 03:51:06 +0200 From: Frederic Weisbecker <fweisbec@...il.com> To: LKML <linux-kernel@...r.kernel.org> Cc: Frederic Weisbecker <fweisbec@...il.com>, Peter Zijlstra <peterz@...radead.org>, Chris Metcalf <cmetcalf@...lanox.com>, Thomas Gleixner <tglx@...utronix.de>, Luiz Capitulino <lcapitulino@...hat.com>, Christoph Lameter <cl@...ux.com>, "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>, Ingo Molnar <mingo@...nel.org>, Mike Galbraith <efault@....de>, Rik van Riel <riel@...hat.com>, Wanpeng Li <kernellwp@...il.com> Subject: [RFC PATCH 07/12] housekeeping: Move it under own config, independant from NO_HZ Complete the housekeeping split from CONFIG_NO_HZ_FULL by moving it under its own config. This way we finally separate the isolation code from nohz. Signed-off-by: Frederic Weisbecker <fweisbec@...il.com> Cc: Chris Metcalf <cmetcalf@...lanox.com> Cc: Rik van Riel <riel@...hat.com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Mike Galbraith <efault@....de> Cc: Ingo Molnar <mingo@...nel.org> Cc: Christoph Lameter <cl@...ux.com> Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> Cc: Wanpeng Li <kernellwp@...il.com> Cc: Luiz Capitulino <lcapitulino@...hat.com> --- include/linux/housekeeping.h | 6 +++--- init/Kconfig | 7 +++++++ kernel/Makefile | 2 +- 3 files changed, 11 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 8514b25..f35bdae 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -472,6 +472,13 @@ config TASK_IO_ACCOUNTING endmenu # "CPU/Task time and stats accounting" +config CPU_ISOLATION + bool "CPU isolation" + 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 8a85c4b..445f876 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -109,7 +109,7 @@ obj-$(CONFIG_JUMP_LABEL) += jump_label.o obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o obj-$(CONFIG_TORTURE_TEST) += torture.o obj-$(CONFIG_MEMBARRIER) += membarrier.o -obj-$(CONFIG_NO_HZ_FULL) += housekeeping.o +obj-$(CONFIG_CPU_ISOLATION) += housekeeping.o obj-$(CONFIG_HAS_IOMEM) += memremap.o -- 2.7.4
Powered by blists - more mailing lists