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From: Guo Ren <guoren@kernel.org>
To: Anup Patel <anup@brainfault.org>
Cc: Anup Patel <anup.patel@wdc.com>,
	Palmer Dabbelt <palmerdabbelt@google.com>,
	 Arnd Bergmann <arnd@arndb.de>,
	linux-riscv <linux-riscv@lists.infradead.org>,
	 "linux-kernel@vger.kernel.org List"
	<linux-kernel@vger.kernel.org>,
	linux-arch <linux-arch@vger.kernel.org>,
	 linux-sunxi@lists.linux.dev, Guo Ren <guoren@linux.alibaba.com>
Subject: Re: [PATCH 1/3] riscv: Fixup _PAGE_GLOBAL in _PAGE_KERNEL
Date: Mon, 24 May 2021 16:22:49 +0800	[thread overview]
Message-ID: <CAJF2gTQOimKQR8nL3SKgC6OP8OcsagFCADfehg4TEt96D9xVpQ@mail.gmail.com> (raw)
In-Reply-To: <CAAhSdy3ORUGqyL-9oMQCKYCXnG8M=xrZ8q+AiWg8s+v6zsk=_A@mail.gmail.com>

Hi Anup,

On Mon, May 24, 2021 at 4:03 PM Anup Patel <anup@brainfault.org> wrote:
>
> On Mon, May 24, 2021 at 12:22 PM <guoren@kernel.org> wrote:
> >
> > From: Guo Ren <guoren@linux.alibaba.com>
> >
> > Kernel virtual address translation should avoid care asid or it'll
> > cause more TLB-miss and TLB-refill. Because the current asid in satp
> > belongs to the current process, but the target kernel va TLB entry's
> > asid still belongs to the previous process.
> >
> > Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
> > Cc: Anup Patel <anup.patel@wdc.com>
> > Cc: Palmer Dabbelt <palmerdabbelt@google.com>
>
> First of all thanks for doing this series, I had similar changes in mind
> as follow-up to the ASID allocator.
>
> I went through all three patches and at least I don't see any
> obvious issue but I think we should try testing it more on a few
> existing platforms.
We've tested it on Allwinner D1 C906 and C910 SMP*4 for a long time,
just hope it won't affect u540.

(In fact, C910 has used ASID allocator for more than two years with
our own kernel-tree. I remember we've talked about it in 2019
plumber.)

>
> Reviewed-by: Anup Patel <anup@brainfault.org>
>
> Regards,
> Anup
>
> > ---
> >  arch/riscv/include/asm/pgtable.h | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> > index 78f2323..017da15 100644
> > --- a/arch/riscv/include/asm/pgtable.h
> > +++ b/arch/riscv/include/asm/pgtable.h
> > @@ -135,6 +135,7 @@
> >                                 | _PAGE_PRESENT \
> >                                 | _PAGE_ACCESSED \
> >                                 | _PAGE_DIRTY \
> > +                               | _PAGE_GLOBAL \
> >                                 | _PAGE_CACHE)
> >
> >  #define PAGE_KERNEL            __pgprot(_PAGE_KERNEL)
> > --
> > 2.7.4
> >



-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/

  reply	other threads:[~2021-05-24  8:23 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-24  6:51 guoren
2021-05-24  6:51 ` [PATCH 2/3] riscv: Fixup PAGE_UP in asm/page.h guoren
2021-05-25  6:34   ` Christoph Hellwig
2021-05-25  9:28     ` Guo Ren
2021-05-25  9:34       ` Christoph Hellwig
2021-05-24  6:51 ` [PATCH 3/3] riscv: Use use_asid_allocator flush TLB guoren
2021-05-24  8:13   ` Anup Patel
2021-05-24  8:03 ` [PATCH 1/3] riscv: Fixup _PAGE_GLOBAL in _PAGE_KERNEL Anup Patel
2021-05-24  8:22   ` Guo Ren [this message]
2021-05-24 10:42 ` Anup Patel
2021-05-24 12:01   ` Guo Ren

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