linux-kernel - Re: [PATCH V8 11/22] LoongArch: Add process management

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Message-ID: <CAAhV-H7akp8RNyw=7qJPgWeApAzf0u4kBNbOHzgQN9Mx3PfzcQ@mail.gmail.com>
Date:   Tue, 22 Mar 2022 11:07:11 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Airlie <airlied@...ux.ie>,
        Jonathan Corbet <corbet@....net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhuacai@...ngson.cn>
Subject: Re: [PATCH V8 11/22] LoongArch: Add process management

Hi, Arnd,

On Mon, Mar 21, 2022 at 4:43 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> On Sat, Mar 19, 2022 at 3:38 PM Huacai Chen <chenhuacai@...nel.org> wrote:
>
> > +#ifdef CONFIG_PAGE_SIZE_64KB
> > +#define THREAD_SIZE_ORDER (0)
> > +#endif
> > +
> > +#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
> > +#define THREAD_MASK (THREAD_SIZE - 1UL)
> > +
>
> Having a 64KB stack area is rather wasteful. I think you should use a sub-page
> allocation in this configuration, or possibly disallow 64KB page configuration
> entirely.
>
> Note that you have to use full pages when using CONFIG_VMAP_STACK, but
> you don't seem to support that at the moment, so allocating only 16KB stacks
> on a 64KB page config should still work.
I think using a 16KB stack for all configurations (4KB/16KB/64KB) is
the simplest way. Right?

Huacai
>
>        Arnd