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* [PATCH] RISC-V: defconfig: Enable NO_HZ_IDLE and HIGH_RES_TIMERS
@ 2019-05-15  6:30 Anup Patel
  2019-05-20  8:05 ` Anup Patel
  0 siblings, 1 reply; 8+ messages in thread
From: Anup Patel @ 2019-05-15  6:30 UTC (permalink / raw)
  To: Palmer Dabbelt, Albert Ou
  Cc: Christoph Hellwig, Atish Patra, linux-riscv, Anup Patel, linux-kernel

This patch enables NO_HZ_IDLE (idle dynamic ticks) and HIGH_RES_TIMERS
(hrtimers) in RV32 and RV64 defconfigs.

Both of the above options are enabled by default for architectures
such as x86, ARM, and ARM64.

The idle dynamic ticks helps use save power by stopping timer ticks
when the system is idle whereas hrtimers is a much improved timer
subsystem compared to the old "timer wheel" based system.

This patch is tested on SiFive Unleashed board and QEMU Virt machine.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
---
 arch/riscv/configs/defconfig      | 2 ++
 arch/riscv/configs/rv32_defconfig | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig
index 2fd3461e50ab..f254c352ec57 100644
--- a/arch/riscv/configs/defconfig
+++ b/arch/riscv/configs/defconfig
@@ -1,5 +1,7 @@
 CONFIG_SYSVIPC=y
 CONFIG_POSIX_MQUEUE=y
+CONFIG_NO_HZ_IDLE=y
+CONFIG_HIGH_RES_TIMERS=y
 CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
 CONFIG_CGROUPS=y
diff --git a/arch/riscv/configs/rv32_defconfig b/arch/riscv/configs/rv32_defconfig
index 1a911ed8e772..d5449ef805a3 100644
--- a/arch/riscv/configs/rv32_defconfig
+++ b/arch/riscv/configs/rv32_defconfig
@@ -1,5 +1,7 @@
 CONFIG_SYSVIPC=y
 CONFIG_POSIX_MQUEUE=y
+CONFIG_NO_HZ_IDLE=y
+CONFIG_HIGH_RES_TIMERS=y
 CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
 CONFIG_CGROUPS=y
-- 
2.17.1

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^ permalink raw reply	[flat|nested] 8+ messages in thread

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2019-05-15  6:30 [PATCH] RISC-V: defconfig: Enable NO_HZ_IDLE and HIGH_RES_TIMERS Anup Patel
2019-05-20  8:05 ` Anup Patel
2019-05-28 17:47   ` Palmer Dabbelt
2019-05-28 19:39     ` Atish Patra
2019-05-29  8:00     ` Andreas Schwab
2019-05-31 20:35       ` Palmer Dabbelt
2019-06-03 16:44         ` Paul Walmsley
2019-06-04  6:41           ` Christoph Hellwig

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