linux-kernel - Re: [PATCH] RISC-V: Enable perf events by default

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Date:   Thu, 24 Mar 2022 10:56:21 +0530
From:   Anup Patel <anup@...infault.org>
To:     Atish Patra <atishp@...shpatra.org>
Cc:     Anup Patel <apatel@...tanamicro.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Alistair Francis <Alistair.Francis@....com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] RISC-V: Enable perf events by default

On Wed, Mar 23, 2022 at 10:04 PM Atish Patra <atishp@...shpatra.org> wrote:
>
> On Wed, Mar 23, 2022 at 2:00 AM Anup Patel <apatel@...tanamicro.com> wrote:
> >
> > Let us enable perf events by default in RV32 and RV64 defconfigs
> > so that we can use RISC-V PMU drivers on various RISC-V platforms.
> >
> > Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> > ---
> >  arch/riscv/configs/defconfig      | 1 +
> >  arch/riscv/configs/rv32_defconfig | 1 +
> >  2 files changed, 2 insertions(+)
> >
> > diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig
> > index f120fcc43d0a..57aaedc7cf74 100644
> > --- a/arch/riscv/configs/defconfig
> > +++ b/arch/riscv/configs/defconfig
> > @@ -15,6 +15,7 @@ CONFIG_CHECKPOINT_RESTORE=y
> >  CONFIG_BLK_DEV_INITRD=y
> >  CONFIG_EXPERT=y
> >  # CONFIG_SYSFS_SYSCALL is not set
> > +CONFIG_PERF_EVENTS=y
> >  CONFIG_SOC_MICROCHIP_POLARFIRE=y
> >  CONFIG_SOC_SIFIVE=y
> >  CONFIG_SOC_VIRT=y
> > diff --git a/arch/riscv/configs/rv32_defconfig b/arch/riscv/configs/rv32_defconfig
> > index 8b56a7f1eb06..21d422e740d5 100644
> > --- a/arch/riscv/configs/rv32_defconfig
> > +++ b/arch/riscv/configs/rv32_defconfig
> > @@ -15,6 +15,7 @@ CONFIG_CHECKPOINT_RESTORE=y
> >  CONFIG_BLK_DEV_INITRD=y
> >  CONFIG_EXPERT=y
> >  # CONFIG_SYSFS_SYSCALL is not set
> > +CONFIG_PERF_EVENTS=y
> >  CONFIG_SOC_SIFIVE=y
> >  CONFIG_SOC_VIRT=y
> >  CONFIG_ARCH_RV32I=y
> > --
> > 2.25.1
> >
>
> I think it is better to enable perf events by adding CONFIG_PROFILING
> to the defconfig similar to other ISAs.

Sure, I will update this patch like you suggested.

Regards,
Anup

>
> --
> Regards,
> Atish