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[89.77.68.124]) by smtp.gmail.com with ESMTPSA id j2sm1346856lfr.109.2021.12.17.03.33.38 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Dec 2021 03:33:38 -0800 (PST) From: Krzysztof Kozlowski To: kernel-team@lists.ubuntu.com Subject: [J/realtime][PATCH] UBUNTU: [Config] realtime: enable CONFIG_NO_HZ_FULL Date: Fri, 17 Dec 2021 12:32:48 +0100 Message-Id: <20211217113248.56947-1-krzysztof.kozlowski@canonical.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.20 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: "kernel-team" The NO_HZ_FULL (selecting also RCU_NOCB_CPU, CONTEXT_TRACKING and VIRT_CPU_ACCOUNTING) is an option dedicated to realtime or high performance computing workloads. It allows to omit scheduling-clock ticks on CPUs that are either idle or that have only one runnable task. It is expected that a realtime workload will isolate CPUs for its realtime tasks (realtime application will run on dedicated CPUs), thus it matches the NO_HZ_FULL type of workload and should benefit from this setting. This setting still requires runtime configuration - choosing CPUs to be nohz idle (see: Documentation/timers/no_hz.rst). The setting was also requested by Intel FlexRAN engineers as it greatly improves their workload. Signed-off-by: Krzysztof Kozlowski Acked-by: Tim Gardner --- debian.realtime/config/config.common.ubuntu | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/debian.realtime/config/config.common.ubuntu b/debian.realtime/config/config.common.ubuntu index 7d1034ccfb26..f494c4d8f058 100644 --- a/debian.realtime/config/config.common.ubuntu +++ b/debian.realtime/config/config.common.ubuntu @@ -1848,6 +1848,8 @@ CONFIG_CONSOLE_LOGLEVEL_QUIET=4 CONFIG_CONSOLE_POLL=y CONFIG_CONSOLE_TRANSLATIONS=y CONFIG_CONTEXT_SWITCH_TRACER=y +CONFIG_CONTEXT_TRACKING=y +# CONFIG_CONTEXT_TRACKING_FORCE is not set CONFIG_CONTIG_ALLOC=y CONFIG_CORDIC=m CONFIG_COREDUMP=y @@ -6894,8 +6896,8 @@ CONFIG_NOUVEAU_PLATFORM_DRIVER=y CONFIG_NOZOMI=m CONFIG_NO_HZ=y CONFIG_NO_HZ_COMMON=y -# CONFIG_NO_HZ_FULL is not set -CONFIG_NO_HZ_IDLE=y +CONFIG_NO_HZ_FULL=y +# CONFIG_NO_HZ_IDLE is not set CONFIG_NR_CPUS_DEFAULT=8192 CONFIG_NR_CPUS_RANGE_BEGIN=8192 CONFIG_NR_CPUS_RANGE_END=8192 @@ -7977,6 +7979,7 @@ CONFIG_RCU_CPU_STALL_TIMEOUT=60 # CONFIG_RCU_EQS_DEBUG is not set # CONFIG_RCU_EXPERT is not set CONFIG_RCU_NEED_SEGCBLIST=y +CONFIG_RCU_NOCB_CPU=y # CONFIG_RCU_REF_SCALE_TEST is not set # CONFIG_RCU_SCALE_TEST is not set CONFIG_RCU_STALL_COMMON=y @@ -10451,7 +10454,6 @@ CONFIG_THUNDER_NIC_BGX=m CONFIG_THUNDER_NIC_PF=m CONFIG_THUNDER_NIC_RGX=m CONFIG_THUNDER_NIC_VF=m -CONFIG_TICK_CPU_ACCOUNTING=y CONFIG_TICK_ONESHOT=y CONFIG_TIFM_7XX1=m CONFIG_TIFM_CORE=m @@ -11633,7 +11635,8 @@ CONFIG_VIRTIO_VDPA=m CONFIG_VIRTIO_VSOCKETS=m CONFIG_VIRTIO_VSOCKETS_COMMON=m CONFIG_VIRTUALIZATION=y -# CONFIG_VIRT_CPU_ACCOUNTING_GEN is not set +CONFIG_VIRT_CPU_ACCOUNTING=y +CONFIG_VIRT_CPU_ACCOUNTING_GEN=y CONFIG_VIRT_DRIVERS=y CONFIG_VIRT_TO_BUS=y CONFIG_VIRT_WIFI=m