> On 5/28/19 10:47 AM, Palmer Dabbelt wrote: >> On Mon, 20 May 2019 01:05:22 PDT (-0700), a...@brainfault.org wrote: >>> On Wed, May 15, 2019 at 12:00 PM Anup Patel <anup.pa...@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.pa...@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.
Are you talking about the trouble with CONFIG_NO_HZ_IDLE we were seeing last year or something else ? CONFIG_NO_HZ_IDLE was well tested and fixed last year. I'm in the process of switching to Yocto right now for my tests, so > it'll be a bit slow. -- Regards, Atish
