linux-kernel - Re: [PATCHv9 04/14] mm/page_alloc: Add sysfs handle to accept accept

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Message-ID: <20230403144145.wss3nudvyyd4xtih@box.shutemov.name>
Date:   Mon, 3 Apr 2023 17:41:45 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Dario Faggioli <dfaggioli@...e.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Mike Rapoport <rppt@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        marcelo.cerri@...onical.com, tim.gardner@...onical.com,
        khalid.elmously@...onical.com, philip.cox@...onical.com,
        aarcange@...hat.com, peterx@...hat.com, x86@...nel.org,
        linux-mm@...ck.org, linux-coco@...ts.linux.dev,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv9 04/14] mm/page_alloc: Add sysfs handle to accept
 accept_memory

On Mon, Apr 03, 2023 at 03:43:32PM +0200, Vlastimil Babka wrote:
> On 3/30/23 13:49, Kirill A. Shutemov wrote:
> > Write amount of memory to accept into the new sysfs handle
> > /sys/kernel/mm/page_alloc/accept_memory.
> > 
> > Write 'all' to the handle to accept all memory in the system.
> > 
> > It can be used to implement background memory accepting from userspace.
> > It is also useful for debugging.
> > 
> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> 
> Somewhat similarly to patch 3, I'd think we don't need this patch in
> mainline without clear usecases first, although it's good to post for
> testing/debugging.

I thought about it as a way to implement #3 from 02/14 commit message:
users who want to accept all memory in background can use the mechanism.

But, again, we can leave out until later.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov