linux-kernel - Re: [PATCH 0/3] Get cache information from userland

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Message-ID: <CANXhq0p7HO=zD7fDyz9O+TFzwFq2tqJva_V6RiFO6PExzuUq=g@mail.gmail.com>
Date:   Mon, 27 Jul 2020 11:03:09 +0800
From:   Zong Li <zong.li@...ive.com>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] Get cache information from userland

On Fri, Jul 3, 2020 at 4:57 PM Zong Li <zong.li@...ive.com> wrote:
>
> There are no standard CSR registers to provide cache information, the
> way for RISC-V is to get this information from DT. Currently, AT_L1I_X,
> AT_L1D_X and AT_L2_X are present in glibc header, and sysconf syscall
> could use them to get information of cache through AUX vector. We
> exploit 'struct cacheinfo' to obtain the information of cache, then we
> don't need additional variable or data structure to record it.
>
> We also need some works in glibc, but we have to support the function in
> kernel first by rule of glibc, then post the patch to glibc site.
>
> The result of 'getconf -a' as follows:
>
> LEVEL1_ICACHE_SIZE                 32768
> LEVEL1_ICACHE_ASSOC                8
> LEVEL1_ICACHE_LINESIZE             64
> LEVEL1_DCACHE_SIZE                 32768
> LEVEL1_DCACHE_ASSOC                8
> LEVEL1_DCACHE_LINESIZE             64
> LEVEL2_CACHE_SIZE                  2097152
> LEVEL2_CACHE_ASSOC                 32
> LEVEL2_CACHE_LINESIZE              64
>
> Zong Li (3):
>   riscv: Set more data to cacheinfo
>   riscv: Define AT_VECTOR_SIZE_ARCH for ARCH_DLINFO
>   riscv: Add cache information in AUX vector
>
>  arch/riscv/include/asm/cacheinfo.h   | 14 +++++
>  arch/riscv/include/asm/elf.h         | 13 ++++
>  arch/riscv/include/uapi/asm/auxvec.h | 24 ++++++++
>  arch/riscv/kernel/cacheinfo.c        | 92 +++++++++++++++++++++++-----
>  4 files changed, 127 insertions(+), 16 deletions(-)
>  create mode 100644 arch/riscv/include/asm/cacheinfo.h
>
> --
> 2.27.0
>

ping