From ad6a3ae6fc0c39a7646b132ca3d7aee84bf713fe Mon Sep 17 00:00:00 2001
From: hanzongcheng <hanzongcheng@huawei.com>
Date: Sun, 6 Nov 2022 15:29:33 +0800
Subject: [PATCH] config: build a low latency kernel
MIME-Version: 1.0
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* Tweaking "CONFIG_HZ" to configure the timer interrupt frequency;
  Enable "CONFIG_NO_HZ_FULL" to allow users to use the “full” tickless mode;
  Set the frequency statically to the highest frequency supported by the CPU.

Signed-off-by: hanzongcheng <hanzongcheng@huawei.com>
---
 config/x86/defconfig-kernel | 32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/config/x86/defconfig-kernel b/config/x86/defconfig-kernel
index e0058741..053fc7a6 100644
--- a/config/x86/defconfig-kernel
+++ b/config/x86/defconfig-kernel
@@ -88,9 +88,12 @@ CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y
 # Timers subsystem
 #
 CONFIG_TICK_ONESHOT=y
-CONFIG_HZ_PERIODIC=y
+CONFIG_NO_HZ_COMMON=y
+# CONFIG_HZ_PERIODIC is not set
 # CONFIG_NO_HZ_IDLE is not set
-# CONFIG_NO_HZ_FULL is not set
+CONFIG_NO_HZ_FULL=y
+CONFIG_CONTEXT_TRACKING=y
+# CONFIG_CONTEXT_TRACKING_FORCE is not set
 # CONFIG_NO_HZ is not set
 CONFIG_HIGH_RES_TIMERS=y
 # end of Timers subsystem
@@ -105,8 +108,8 @@ CONFIG_PREEMPT_DYNAMIC=y
 #
 # CPU/Task time and stats accounting
 #
-CONFIG_TICK_CPU_ACCOUNTING=y
-# CONFIG_VIRT_CPU_ACCOUNTING_GEN is not set
+CONFIG_VIRT_CPU_ACCOUNTING=y
+CONFIG_VIRT_CPU_ACCOUNTING_GEN=y
 # CONFIG_IRQ_TIME_ACCOUNTING is not set
 CONFIG_BSD_PROCESS_ACCT=y
 CONFIG_BSD_PROCESS_ACCT_V3=y
@@ -133,6 +136,7 @@ CONFIG_TASKS_RCU=y
 CONFIG_TASKS_RUDE_RCU=y
 CONFIG_RCU_STALL_COMMON=y
 CONFIG_RCU_NEED_SEGCBLIST=y
+CONFIG_RCU_NOCB_CPU=y
 # end of RCU Subsystem
 
 # CONFIG_IKCONFIG is not set
@@ -163,8 +167,7 @@ CONFIG_MEMCG_KMEM=y
 CONFIG_BLK_CGROUP=y
 CONFIG_CGROUP_WRITEBACK=y
 CONFIG_CGROUP_SCHED=y
-CONFIG_QOS_SCHED=y
-# CONFIG_QOS_SCHED_SMT_EXPELLER is not set
+# CONFIG_QOS_SCHED is not set
 # CONFIG_SCHED_PRIO_LB is not set
 CONFIG_FAIR_GROUP_SCHED=y
 CONFIG_CFS_BANDWIDTH=y
@@ -180,7 +183,7 @@ CONFIG_CGROUP_CPUACCT=y
 CONFIG_CGROUP_PERF=y
 # CONFIG_CGROUP_DEBUG is not set
 CONFIG_SOCK_CGROUP_DATA=y
-CONFIG_CGROUP_FILES=y
+# CONFIG_CGROUP_FILES is not set
 CONFIG_NAMESPACES=y
 CONFIG_UTS_NS=y
 CONFIG_TIME_NS=y
@@ -188,7 +191,7 @@ CONFIG_IPC_NS=y
 CONFIG_USER_NS=y
 CONFIG_PID_NS=y
 CONFIG_NET_NS=y
-CONFIG_SCHED_STEAL=y
+# CONFIG_SCHED_STEAL is not set
 # CONFIG_CHECKPOINT_RESTORE is not set
 CONFIG_SCHED_AUTOGROUP=y
 # CONFIG_SYSFS_DEPRECATED is not set
@@ -446,10 +449,10 @@ CONFIG_EFI=y
 CONFIG_EFI_STUB=y
 CONFIG_EFI_MIXED=y
 # CONFIG_HZ_100 is not set
-CONFIG_HZ_250=y
+# CONFIG_HZ_250 is not set
 # CONFIG_HZ_300 is not set
-# CONFIG_HZ_1000 is not set
-CONFIG_HZ=250
+CONFIG_HZ_1000=y
+CONFIG_HZ=1000
 CONFIG_SCHED_HRTICK=y
 CONFIG_KEXEC=y
 # CONFIG_KEXEC_FILE is not set
@@ -575,9 +578,9 @@ CONFIG_CPU_FREQ=y
 CONFIG_CPU_FREQ_GOV_ATTR_SET=y
 CONFIG_CPU_FREQ_GOV_COMMON=y
 # CONFIG_CPU_FREQ_STAT is not set
-# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
+CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
 # CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set
-CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
+# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
 # CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL is not set
 CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
 # CONFIG_CPU_FREQ_GOV_POWERSAVE is not set
@@ -2843,7 +2846,6 @@ CONFIG_SPI_DYNAMIC=y
 # CONFIG_HSI is not set
 CONFIG_PPS=m
 # CONFIG_PPS_DEBUG is not set
-# CONFIG_NTP_PPS is not set
 
 #
 # PPS clients support
@@ -4826,7 +4828,7 @@ CONFIG_INIT_STACK_NONE=y
 # end of Memory initialization
 # end of Kernel hardening options
 
-CONFIG_SECURITY_BOOT_INIT=y
+# CONFIG_SECURITY_BOOT_INIT is not set
 # end of Security options
 
 CONFIG_XOR_BLOCKS=y
-- 
Gitee