Messages in this thread | | | Date | Tue, 28 May 2019 10:47:51 -0700 (PDT) | Subject | Re: [PATCH] RISC-V: defconfig: Enable NO_HZ_IDLE and HIGH_RES_TIMERS | From | Palmer Dabbelt <> |
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On Mon, 20 May 2019 01:05:22 PDT (-0700), anup@brainfault.org wrote: > On Wed, May 15, 2019 at 12:00 PM Anup Patel <Anup.Patel@wdc.com> wrote: >> >> 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 >> > > Hi All, > > Any comments on this one? > > @Palmer, It would be nice to have this in Linux-5.2
My only issue here is testing: IIRC last time we tried this it ended up causing trouble. I'm in the process of switching to Yocto right now for my tests, so it'll be a bit slow.
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