linux-kernel - Re: [PATCH V2] riscv: export cpu/freq invariant to scheduler

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Message-ID: <20230323172403.nfrtgm5vea4qvinu@orel>
Date:   Thu, 23 Mar 2023 18:24:03 +0100
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Song Shuai <suagrfillet@...il.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, conor.dooley@...rochip.com,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] riscv: export cpu/freq invariant to scheduler

On Thu, Mar 23, 2023 at 08:39:24PM +0800, Song Shuai wrote:
> RISC-V now manages CPU topology using arch_topology which provides
> CPU capacity and frequency related interfaces to access the cpu/freq
> invariant in possible heterogeneous or DVFS-enabled platforms.
> 
> Here adds topology.h file to export the arch_topology interfaces for
> replacing the scheduler's constant-based cpu/freq invariant accounting.
> 
> Signed-off-by: Song Shuai <suagrfillet@...il.com>
> ---
> changes from V1:
>   - fix the leading underscore and tidy the patch up 
> ---
>  arch/riscv/include/asm/topology.h | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>  create mode 100644 arch/riscv/include/asm/topology.h
> 
> diff --git a/arch/riscv/include/asm/topology.h b/arch/riscv/include/asm/topology.h
> new file mode 100644
> index 000000000000..727e8d163a3b
> --- /dev/null
> +++ b/arch/riscv/include/asm/topology.h
> @@ -0,0 +1,20 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_RISCV_TOPOLOGY_H
> +#define _ASM_RISCV_TOPOLOGY_H
> +
> +#include <linux/arch_topology.h>
> +
> +/* Replace task scheduler's default frequency-invariant accounting */
> +#define arch_scale_freq_tick	topology_scale_freq_tick
> +#define arch_set_freq_scale	topology_set_freq_scale

I was thinking all the right hand side would line up, which means
the above two need additional tabs and so does topology_get_cpu_scale.

> +#define arch_scale_freq_capacity	topology_get_freq_scale
> +#define arch_scale_freq_invariant	topology_scale_freq_invariant
> +
> +/* Replace task scheduler's default cpu-invariant accounting */
> +#define arch_scale_cpu_capacity	topology_get_cpu_scale
> +
> +/* Enable topology flag updates */
> +#define arch_update_cpu_topology	topology_update_cpu_topology
> +
> +#include <asm-generic/topology.h>

I'd also prefer a blank line here.

> +#endif /* _ASM_RISCV_TOPOLOGY_H */
> -- 
> 2.20.1
>

Otherwise,

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>

Thanks,
drew