linux-kernel - Re: [PATCH 5/8] x86/clear_page: add clear_page

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Message-ID: <20201015103535.GC11838@zn.tnic>
Date:   Thu, 15 Oct 2020 12:35:35 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Ankur Arora <ankur.a.arora@...cle.com>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Andy Lutomirski <luto@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Michal Hocko <mhocko@...nel.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, X86 ML <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ira Weiny <ira.weiny@...el.com>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH 5/8] x86/clear_page: add clear_page_uncached()

On Wed, Oct 14, 2020 at 08:37:44PM -0700, Ankur Arora wrote:
> I don't disagree but I think the selection of cached/uncached route should
> be made where we have enough context available to be able to choose to do
> this.
>
> This could be for example, done in mm_populate() or gup where if say the
> extent is larger than LLC-size, it takes the uncached path.

Are there examples where we don't know the size?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette